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I lost the plot (not unusual): Have we determined, for sure, that the
problem is 'slippage,' which would most likely be due to wear in the O/D
cone clutch? Or have we determined that Simon's O/D is 'dropping out'
which, to my thinking, would be caused by the 8 strong springs
overcoming hydraulic pressure (and causing the brake ring to slip or
disengage, no?).
On 4/26/2024 10:03 AM, Hank Leach wrote:
> Ok the pressure gauge implies that the hydraulic system is in good
> condition and that will effectively produce overdrive when the cone
> clutch is pushed forward in the box. When OD is *not required* the
> solenoid is inactive and the 8 springs in the unit have to keep the
> cone clutch in the rearward or in direct drive position.
> These are stout springs and normally are strong enough to engage and
> hold the clutch without slipping, overcoming the hydraulic
> influence-which should be draining at this point..However if the
> springs are misinstalled in the wrong position or not properly mounted
> on their tabs upon assembly or previously "coil bound" from that
> procedure or wear, they will not function to keep direct drive solid
> without slipping.
> The clutch material should outlive all of us and is not normally, or
> easily, replaced. All you have to keep the car in direct drive are
> those 8 springs and their pressure.
> -Hate to say it but if the re-assembly was defective, the gearbox
> needs to come out and OD removed and checked for correct spring fit-at
> that time I would replace the 8 springs (about $100 from Moss) as a
> routine repair. (photos from my article in AH Mag) Hank
>
> From: "Bob Spidell" <bspidell@comcast.net>
> To: <healeys@autox.team.net>
> Sent: April 26, 2024 at 9:37 AM PDT
> Subject: Re: [Healeys] Overdrive pressure or clutch slip Step 2!
> Spitballing ...
>
> I went through my BJ8's O/D a few years ago. The car had 64K miles on
> it when I bought it (approx. 1984), and about 215K* miles on it when I
> did the overhaul. The O/D cone clutch was serviceable--and AFAIK
> didn't slip--and I reinstalled it. If new cone clutches were readily
> available I /might/ have bought new, on principle, depending on cost,
> but all I could find was a re-manned one from DWM. To me this implied
> they didn't often need replacement, whereas known wear items like the
> accumulator are offered by several vendors (I would have installed one
> with an O-ring if I'd known about it).
>
> All this to say, unless the car has extremely high mileage and/or the
> O/D has been abused somehow I'd be surprised if the clutch is worn 'to
> the bone.' Obviously, slippage in the cone clutch would cause Simon's
> car's symptoms; if so, the problem will get progressively worse (and
> more consistent). I think one way to test an O/D clutch would be to
> really lug the car pulling an uphill grade in 4th-O/D, if the clutch
> is going to slip it would do it then (as would a worn engine clutch).
> There's also a (remote) possibility that, for some reason, O/D
> pressure fluctuates during driving.
>
>
> * Anyone else have this many or more known miles on a Healey?
>
> bs
>
>
>
> On 4/26/2024 4:51 AM, Michael Salter wrote:
>
> "What I canâ??t do is understand the leap to the OD cone clutch?"
> Â Fair question.
> Between the flywheel and the rear wheels there are only 2 places
> where "slippage" can occur these are the clutch and the
> overdrive's cone clutch.
> The gearbox, other than the cone clutch in the overdrive, is a
> go/no go arrangement, i.e. no "slippage".
> The rear wheel splines, believe it or not, can also produce
> "slippage " if they are in really bad condition but I presume that
> isn't the case here.
> The test that you just completed resulted in no driveline slippage
> when the overdrive was disabled.
> You are reporting slippage when the overdrive operating system is
> enabled so it follows that further diagnosis of that is required.
> Yes, your next step would be the same test drive, i.e. full engine
> torque on an uphill grade, to confirm that the slippage issue has
> returned now that the overdriveoperating valvehasbe re-installed.
> I would do this test drive BEFORE making any adjustments to the
> overdrive valve or solenoid in order to confirm that meerly
> installing the overdrive operating valve resulted in the slippage
> issue returning.
> Hope the weather improves, beautiful day here.
> M
>
> On Fri., Apr. 26, 2024, 7:24 a.m. Simon Lachlan,
> <simon.lachlan@alexarevel.plus.com> wrote:
>
> Hi, Thanks for this.
>
> Not sure I understand fully.
>
> Once Iâ??d finished the test drive with the OD operating valve
> out of the car, I returned the rod, ball, spring etc and put
> in the gauge rather than the nut. And got 500+ psi.
>
> What I canâ??t do is understand the leap to the OD cone clutch.
> Not arguingâ?¦just saying no comprende. As I sat in the car, I
> was thinking that the function of the OD seems OK and that
> itâ??s being interfered with by something in its
> circuitryâ?¦â?¦relay, solenoid or throttle switch. Thatâ??s probably
> wishful thinking as I really donâ??t want to be swimming in
> those waters.
>
> I did, as a matter of course, clean out the tiny hole in the
> rod but didnâ??t detect any blockageâ?¦.which doesnâ??t mean much as
> something minute could have been inside and been washed away
> by the detergent/hot water then WD40â?¦..
>
> After someoneâ??s advice â?? some time back â?? Iâ??ve got another rod
> whose aperture has been drilled out to 1.5mm. This was â??to
> allow the OD to disengage fasterâ??. Donâ??t recall if I tried it.
> Could that rod be any help here?
>
> The ball seems to be sitting square on its seat and the tip of
> the rod, where the ball sits, is not worn or chipped.
>
> Residual pressureâ?¦.. goes to 500+ when I switch OD ON and
> stays there until, engine and switch OFF, I energize the
> solenoid a few times whereupon it drops to zero.
>
> Another test drive(s) seems called for. But the hood is off to
> enable access and the forecast is grim for the next week.
>
> Very open to more suggestions. Thanks,
>
> Simon
>
> *From:*Michael Salter <michaelsalter@gmail.com>
> *Sent:* Friday, April 26, 2024 12:14 AM
> *To:* Simon Lachlan <simon.lachlan@alexarevel.plus.com>
> *Cc:* Healeys <healeys@autox.team.net>
> *Subject:* Re: Overdrive pressure or clutch slip Step 2!
>
> Okay, then it is confirmed that neither the clutch (on the
> flywheel) nor the overdrive cone clutch (in it's normal drive
> condition) are producing the slippage.
>
> From this we can conclude that even when the overdrive
> solenoid is *_not_* energized the slippage is occurring at the
> overdrive cone clutch and that for some reason hydraulic
> pressure is finding its way into the overdrive operating
> cylinders even when the overdrive operating valve is closed.
>
> This can be caused by leakage past operating the valve or
> residual pressure.
>
> The question of residual pressure can be resolved by checking
> that the bleed hole in the bottom of the long overdrive valve
> push rod is not blocked.
>
> Whether or not hydraulic pressure is leaking past the
> operating valve ball can be checked by ensuring that the ball
> is clearly on its seat when the operating valve is *_not
> _*Â energized.
>
> M
>
> On Thu., Apr. 25, 2024, 3:38 p.m. Simon Lachlan,
> <simon.lachlan@alexarevel.plus.com> wrote:
>
> Of course. Isnâ??t that how I got the 520psi?
>
> *From:*Michael Salter <michaelsalter@gmail.com>
> *Sent:* Thursday, April 25, 2024 6:19 PM
> *To:* Simon Lachlan <simon.lachlan@alexarevel.plus.com>
> *Cc:* Healeys <healeys@autox.team.net>
> *Subject:* Re: Overdrive pressure or clutch slip Step 2!
>
> Question ... when you got home and did the pressure test
> I presume that was AFTER you had put the valve with the
> "top hat", ball, spring and valve rod cap and washer back
> into position?
>
> M
>
> On Thu., Apr. 25, 2024, 12:29 p.m. Simon Lachlan,
> <simon.lachlan@alexarevel.plus.com> wrote:
>
> So, here is Michaelâ??s â??Step 1â?? completed. (See his
> email, below).
>
> 1. Removed the operating valve and, just for luck,
> disconnected the two wires into 3^rd /4^th switch.
> Took the car for a spin. Up/down longish/steepish
> hills, 10 miles on motorway. Various rpmâ?¦..no
> slippage at all.
> 2. Had a punctureâ?¦..nail in tyre. Rear RHS. Flat as a
> pancake at once. Nearly onto rim. Nail! I imagine
> the inner tube is shredded and the tyre may be a
> write-off. (Usually are!). Anyhow, I bore you with
> this as Iâ??m convinced that Iâ??d never have got the
> wheel off without the little scissors jack which I
> carry to get the car up the first few inches until
> the Healey jack comes into play. Just a suggestion��.
> 3. Got home and jacked car up to test pressure.
> Steady at 520psi which, I recall, is plenty.
> Stayed at 520 across rev range. Dropped very
> slowly once engine was off and dropped to zero as
> I engaged/disengaged OD a few times. Which is
> normal I think?
> 4. Solenoid makes a robust â??clickâ?? when it should and
> engages the OD when activated.
>
> So whatâ??s a sensible â??Step 2â????
>
> I have been urged to check the setting of the Throttle
> Switch (TS). Assuming that the slippage returns (and
> why wouldnâ??t it?), Iâ??ll short the TS out to see if
> that fixes it. If it does, Iâ??ll check the adjustment.
>
> Suggestions would be more than welcome��I do dread
> having to take that box out again. Iâ??ve got a very
> adequate ramp and a very strong volunteer(?) but,
> regardless of all that, itâ??s still quite a task. And,
> like a few of us, Iâ??m not as young as I once was. Iâ??ve
> always enjoyed the lines from the manual which I
> reproduce, below. ���Gently easeâ??!?!
>
> Thanks, Simon
>
> *From:*Michael Salter <michaelsalter@gmail.com>
> *Sent:* Monday, April 22, 2024 3:21 PM
> *To:* Simon Lachlan <simon.lachlan@alexarevel.plus.com>
> *Cc:* Healeys <healeys@autox.team.net>
> *Subject:* Re: [Healeys] Overdrive pressure or clutch slip
>
> *_Correct diagnosis is 1/2 the repair!!_*
>
> First you need to confirm whether the clutch (on the
> flywheel) or the overdrive is causing the slippage.
>
> To do this you ABSOLUTELY MUST disable the overdrive
> as a badly misadjuster overdrive operating valve can
> produce similar symptoms.
>
> To do this I would remove the overdrive operating
> valve completely. (There are other ways but this is
> absolutely definitive).
>
> Now drive the car up a long hill where you are amle to
> use full throttle at around 3000 RPM (maximum torque)
> for a few seconds. If it is the clutch (on the
> flywheel) that is causing the slippage these operating
> conditions. Test this a few times to be sure.
>
> If there is no slippage we have confirmed that the
> overdrive clutch is at fault.
>
> Step 1 completed. Please report results. MS.
>
> On Mon., Apr. 22, 2024, 8:08 a.m. Simon Lachlan
> via Healeys, <healeys@autox.team.net> wrote:
>
> You may recall the very extended overdrive and
> clutch saga last year. Long story short(ish)â?¦
>
> OD was slipping in and out depending on oil
> temperature.
>
> Correctly diagnosed pressure. Checked with gauge.
>
> Attempted rebuildâ?¦going only so far as
> accumulator and related seals.
>
> Stymied as could not get pump out. Turned out
> to have been â??fixedâ?? at some stage with some
> form of â??chemical metalâ?? which was coming
> loose/apart.
>
> Took it up to OD Spares who fixed it..new
> housing etcetc
>
> Why not a new clutch I thought? Sensible while
> youâ??re in the area looking at a 30+ yr old item.
>
> New clutchâ?¦no good. Noisy, wouldnâ??t
> engage/disengage/play at all.
>
> Gearbox out again.
>
> Refit clutch. Presumed Iâ??d made some
> beginnerâ??s mistake.
>
> Refit gearboxâ?¦no good. Same
>
> Canâ??t recall whether I tried again. Lost count
> and enthusiasm by now.
>
> Turned out that the new clutch kit was
> defective. (Thanks Mirek) (Genuine B&B from
> AHSpares).
>
> New one did work.
>
> Saga over until yesterday.
>
> Same sort of symptomsâ?¦..
>
> Allâ??s well for first 10 or so miles. Then the
> dreaded slippage(?) starts. But itâ??s not quite
> the same. Reminds me more of a slipping
> clutch. (But NO smell)
>
> Symptoms continue if itâ??s in or out of OD.
>
> Symptoms reduce at speed.
>
> Yes, plenty of oil. Over the full mark. Looks
> very clean. Pretty sure itâ??s 40wt
> non-detergent topped up with 30wt
> non-detergent. (Or vice-versa). Am confident
> in state of the filter, magnets etc.
>
> No, I have not pressure tested it yet and yes,
> I dread restarting the whole bloody process
> all over again. Iâ??m not sure I can face taking
> the box out again once, let alone multiple times.
>
> What I want and experience tells me Iâ??m
> unlikely to get is a miracle cure!
>
> One initial questionâ?¦..do OD relays either
> work or not work? ie, can the relay hover
> between on and off which might lead to the OD
> coming in and out? I think that could happen
> if the switch is off but the unit still hasnâ??t
> got the message to disengage from the bulkhead
> switch.
>
> And a supplementaryâ?¦.how do I bench test the
> relay?
>
> Simon
>
>
> _______________________________________________
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>
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>
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>
>
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I lost the plot (not unusual): Have we determined, for sure, that
the problem is 'slippage,' which would most likely be due to wear in
the O/D cone clutch? Or have we determined that Simon's O/D is
'dropping out' which, to my thinking, would be caused by the 8
strong springs overcoming hydraulic pressure (and causing the brake
ring to slip or disengage, no?). <br>
<br>
<br>
<div class="moz-cite-prefix">On 4/26/2024 10:03 AM, Hank Leach
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ccb0229d-6f2f-e212-adca-3fd294168dc6@charter.net">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div>Ok the pressure gauge implies that the hydraulic system is in
good condition and that will effectively produce overdrive when
the cone clutch is pushed forward in the box. When OD is <strong>not
required</strong> the solenoid is inactive and the 8 springs
in the unit have to keep the cone clutch in the rearward or in
direct drive position.</div>
<div>These are stout springs and normally are strong enough to
engage and hold the clutch without slipping, overcoming the
hydraulic influence-which should be draining at this
point..However if the springs are misinstalled in the wrong
position or not properly mounted on their tabs upon assembly or
previously "coil bound" from that procedure or wear, they will
not function to keep direct drive solid without slipping.</div>
<div>The clutch material should outlive all of us and is not
normally, or easily, replaced. All you have to keep the car in
direct drive are those 8 springs and their pressure.<br>
-Hate to say it but if the re-assembly was defective, the
gearbox needs to come out and OD removed and checked for correct
spring fit-at that time I would replace the 8 springs (about
$100 from Moss) as a routine repair. (photos from my article in
AH Mag) Hank<br>
<br>
From: "Bob Spidell" <a class="moz-txt-link-rfc2396E"
href="mailto:bspidell@comcast.net";><bspidell@comcast.net></a> <br>
To: <a class="moz-txt-link-rfc2396E"
href="mailto:healeys@autox.team.net";><healeys@autox.team.net></a> <br>
Sent: April 26, 2024 at 9:37 AM PDT <br>
Subject: Re: [Healeys] Overdrive pressure or clutch slip Step 2!
<br>
Spitballing ...<br>
<br>
I went through my BJ8's O/D a few years ago. The car had 64K
miles on it when I bought it (approx. 1984), and about 215K*
miles on it when I did the overhaul. The O/D cone clutch was
serviceable--and AFAIK didn't slip--and I reinstalled it. If new
cone clutches were readily available I <em>might</em> have
bought new, on principle, depending on cost, but all I could
find was a re-manned one from DWM. To me this implied they
didn't often need replacement, whereas known wear items like the
accumulator are offered by several vendors (I would have
installed one with an O-ring if I'd known about it).<br>
<br>
All this to say, unless the car has extremely high mileage
and/or the O/D has been abused somehow I'd be surprised if the
clutch is worn 'to the bone.' Obviously, slippage in the cone
clutch would cause Simon's car's symptoms; if so, the problem
will get progressively worse (and more consistent). I think one
way to test an O/D clutch would be to really lug the car pulling
an uphill grade in 4th-O/D, if the clutch is going to slip it
would do it then (as would a worn engine clutch). There's also a
(remote) possibility that, for some reason, O/D pressure
fluctuates during driving.<br>
<br>
<br>
* Anyone else have this many or more known miles on a Healey?<br>
<br>
bs<br>
<br>
<br>
<br>
</div>
<div class="moz-cite-prefix">On 4/26/2024 4:51 AM, Michael Salter
wrote:</div>
<blockquote>
<div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">"What I
canâ??t do is understand the leap to the OD cone
clutch?"</span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">Â </span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">Â Fair
question.</span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">Between
the flywheel and the rear wheels there are only 2 places
where "slippage" can occur these are the clutch and the
overdrive's cone clutch. </span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">The
gearbox, other than the cone clutch in the overdrive, is a
go/no go arrangement, i.e. no "slippage".</span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">The
rear wheel splines, believe it or not, can also produce
"slippage " if they are in really bad condition but I
presume that isn't the case here.</span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">Â </span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">The
test that you just completed resulted in no driveline
slippage when the overdrive was disabled. </span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">You are
reporting slippage when the overdrive operating system is
enabled so it follows that further diagnosis of that is
required.</span></div>
<div><span
style="font-family: 'times new roman',serif; font-size: 12.8px;">Â </span></div>
<div><span style="font-size: 12.8px;">Yes, your next step
would be the same test drive, i.e. full engine torque on
an uphill grade, to confirm that the slippage issue has
returned now that the overdriveoperating valvehasbe
re-installed.  </span></div>
<div><span style="font-size: 12.8px;">I would do this test
drive BEFORE making any adjustments to the overdrive valve
or solenoid in order to confirm that meerly installing the
overdrive operating valve resulted in the slippage issue
returning. </span></div>
<div><span style="font-size: 12.8px;">Hope the weather
improves, beautiful day here.</span></div>
<div><span style="font-size: 12.8px;">M</span></div>
</div>
<br>
<div class="gmail_quote">
<div class="gmail_attr">On Fri., Apr. 26, 2024, 7:24 a.m.
Simon Lachlan, <<a class="moz-txt-link-freetext"
href="mailto:simon.lachlan@alexarevel.plus.com";
target="_blank" rel="noopener"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a>>
wrote:</div>
<blockquote class="gmail_quote"
style="margin: 0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;">
<div style="word-wrap: break-word;">
<div>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Hi,
Thanks for this.</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Not
sure I understand fully. </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Once
Iâ??d finished the test drive with the OD operating
valve out of the car, I returned the rod, ball,
spring etc and put in the gauge rather than the nut.
And got 500+ psi. </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">What I
canâ??t do is understand the leap to the OD cone
clutch. Not arguingâ?¦just saying no comprende. As I
sat in the car, I was thinking that the function of
the OD seems OK and that itâ??s being interfered with
by something in its circuitry��relay, solenoid or
throttle switch. Thatâ??s probably wishful thinking as
I really donâ??t want to be swimming in those
waters.</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">I did,
as a matter of course, clean out the tiny hole in
the rod but didnâ??t detect any blockageâ?¦.which
doesnâ??t mean much as something minute could have
been inside and been washed away by the
detergent/hot water then WD40â?¦..</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">After
someoneâ??s advice â?? some time back â?? Iâ??ve got another
rod whose aperture has been drilled out to 1.5mm.
This was â??to allow the OD to disengage fasterâ??.
Donâ??t recall if I tried it. Could that rod be any
help here?</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">The
ball seems to be sitting square on its seat and the
tip of the rod, where the ball sits, is not worn or
chipped.</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Residual
pressureâ?¦.. goes to 500+ when I switch OD ON and
stays there until, engine and switch OFF, I energize
the solenoid a few times whereupon it drops to
zero.</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Another
test drive(s) seems called for. But the hood is off
to enable access and the forecast is grim for the
next week.</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Very
open to more suggestions. Thanks,</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New
Roman',serif;">Simon</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<div
style="border: none; border-top: solid #e1e1e1 1.0pt; padding: 3.0pt 0cm 0cm
0cm;">
<p class="MsoNormal"><strong><span
style="font-size: 11.0pt; font-family:
'Calibri',sans-serif;">From:</span></strong><span
style="font-size: 11.0pt; font-family: 'Calibri',sans-serif;"> Michael
Salter <<a class="moz-txt-link-freetext"
href="mailto:michaelsalter@gmail.com";
target="_blank" rel="noopener"
moz-do-not-send="true">michaelsalter@gmail.com</a>>
<br>
<strong>Sent:</strong> Friday, April 26, 2024
12:14 AM<br>
<strong>To:</strong> Simon Lachlan <<a
class="moz-txt-link-freetext"
href="mailto:simon.lachlan@alexarevel.plus.com";
target="_blank" rel="noopener"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a>><br>
<strong>Cc:</strong> Healeys <<a
class="moz-txt-link-freetext"
href="mailto:healeys@autox.team.net";
target="_blank" rel="noopener"
moz-do-not-send="true">healeys@autox.team.net</a>><br>
<strong>Subject:</strong> Re: Overdrive pressure
or clutch slip Step 2!</span></p>
</div>
<p class="MsoNormal">Â </p>
<div>
<p class="MsoNormal">Okay, then it is confirmed that
neither the clutch (on the flywheel) nor the
overdrive cone clutch (in it's normal drive
condition) are producing the slippage. </p>
<div>
<p class="MsoNormal">From this we can conclude that
even when the overdrive solenoid is
<strong><u>not</u></strong>
energized the slippage is occurring at the
overdrive cone clutch and that for some reason
hydraulic pressure is finding its way into the
overdrive operating cylinders even when the
overdrive operating valve is closed.</p>
</div>
<div>
<p class="MsoNormal">This can be caused by leakage
past operating the valve or residual pressure.</p>
</div>
<div>
<p class="MsoNormal">The question of residual
pressure can be resolved by checking that the
bleed hole in the bottom of the long overdrive
valve push rod is not blocked.</p>
</div>
<div>
<p class="MsoNormal">Whether or not hydraulic
pressure is leaking past the operating valve ball
can be checked by ensuring that the ball is
clearly on its seat when the operating valve is
<strong><u>not </u></strong> energized.</p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">M</p>
</div>
</div>
<p class="MsoNormal">Â </p>
<div>
<div>
<p class="MsoNormal">On Thu., Apr. 25, 2024, 3:38
p.m. Simon Lachlan, <<a
class="moz-txt-link-freetext"
href="mailto:simon.lachlan@alexarevel.plus.com";
target="_blank" rel="noopener"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a>>
wrote:</p>
</div>
<blockquote
style="border: none; border-left: solid #cccccc 1.0pt; padding: 0cm 0cm 0cm
6.0pt; margin-left: 4.8pt; margin-right: 0cm;">
<div>
<div>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Of course. Isnâ??t that how
I got the 520psi?</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<div
style="border: none; border-top: solid #e1e1e1 1.0pt; padding: 3.0pt 0cm 0cm
0cm;">
<p class="MsoNormal"><strong><span
style="font-size: 11.0pt; font-family:
'Calibri',sans-serif;">From:</span></strong><span
style="font-size: 11.0pt; font-family: 'Calibri',sans-serif;"> Michael
Salter <<a
class="moz-txt-link-freetext"
href="mailto:michaelsalter@gmail.com";
target="_blank" rel="noopener"
moz-do-not-send="true">michaelsalter@gmail.com</a>>
<br>
<strong>Sent:</strong> Thursday, April 25,
2024 6:19 PM<br>
<strong>To:</strong> Simon Lachlan <<a
class="moz-txt-link-freetext"
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
rel="noopener"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a>><br>
<strong>Cc:</strong> Healeys <<a
class="moz-txt-link-freetext"
href="mailto:healeys@autox.team.net";
target="_blank" rel="noopener"
moz-do-not-send="true">healeys@autox.team.net</a>><br>
<strong>Subject:</strong> Re: Overdrive
pressure or clutch slip Step 2!</span></p>
</div>
<p class="MsoNormal">Â </p>
<div>
<p class="MsoNormal">Question ... when you
got home and did the pressure test I presume
that was AFTER you had put the valve with
the "top hat", ball, spring and valve rod
cap and washer back into position?</p>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">M</p>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
</div>
</div>
<p class="MsoNormal">Â </p>
<div>
<div>
<p class="MsoNormal">On Thu., Apr. 25, 2024,
12:29 p.m. Simon Lachlan, <<a
class="moz-txt-link-freetext"
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
rel="noopener"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a>>
wrote:</p>
</div>
<blockquote
style="border: none; border-left: solid #cccccc 1.0pt; padding: 0cm 0cm 0cm
6.0pt; margin: 5.0pt 0cm 5.0pt 4.8pt;">
<div>
<div>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">So, here is Michaelâ??s
â??Step 1â?? completed. (See his email,
below).</span></p>
<ol>
<li class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Removed the operating
valve and, just for luck,
disconnected the two wires into
3<sup>rd</sup>/4<sup>th</sup>
switch. Took the car for a spin.
Up/down longish/steepish hills, 10
miles on motorway. Various
rpmâ?¦..no slippage at all.</span></li>
<li class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Had a punctureâ?¦..nail in
tyre. Rear RHS. Flat as a pancake
at once. Nearly onto rim. Nail! I
imagine the inner tube is shredded
and the tyre may be a write-off.
(Usually are!). Anyhow, I bore you
with this as Iâ??m convinced that
Iâ??d never have got the wheel off
without the little scissors jack
which I carry to get the car up
the first few inches until the
Healey jack comes into play. Just
a suggestion��.</span></li>
<li class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Got home and jacked car up
to test pressure. Steady at 520psi
which, I recall, is plenty. Stayed
at 520 across rev range. Dropped
very slowly once engine was off
and dropped to zero as I
engaged/disengaged OD a few times.
Which is normal I think?</span></li>
<li class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Solenoid makes a robust
â??clickâ?? when it should and engages
the OD when activated.</span></li>
</ol>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">So whatâ??s a sensible â??Step
2â????</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">I have been urged to check
the setting of the Throttle Switch
(TS). Assuming that the slippage
returns (and why wouldnâ??t it?), Iâ??ll
short the TS out to see if that
fixes it. If it does, Iâ??ll check the
adjustment.</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Suggestions would be more
than welcome��I do dread having to
take that box out again. Iâ??ve got a
very adequate ramp and a very strong
volunteer(?) but, regardless of all
that, itâ??s still quite a task. And,
like a few of us, Iâ??m not as young
as I once was. Iâ??ve always enjoyed
the lines from the manual which I
reproduce, below. ���Gently easeâ??!?!
</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Thanks, Simon</span></p>
<p class="MsoNormal"><span
style="font-family: 'Times New Roman',serif;">Â </span></p>
<div
style="border: none; border-top: solid #e1e1e1 1.0pt; padding: 3.0pt 0cm 0cm
0cm;">
<p class="MsoNormal"><strong><span
style="font-size: 11.0pt; font-family:
'Calibri',sans-serif;">From:</span></strong><span
style="font-size: 11.0pt; font-family: 'Calibri',sans-serif;"> Michael
Salter <<a
class="moz-txt-link-freetext"
href="mailto:michaelsalter@gmail.com"; target="_blank" rel="noopener"
moz-do-not-send="true">michaelsalter@gmail.com</a>>
<br>
<strong>Sent:</strong> Monday,
April 22, 2024 3:21 PM<br>
<strong>To:</strong> Simon Lachlan
<<a
class="moz-txt-link-freetext"
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
rel="noopener"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a>><br>
<strong>Cc:</strong> Healeys <<a
class="moz-txt-link-freetext"
href="mailto:healeys@autox.team.net"; target="_blank" rel="noopener"
moz-do-not-send="true">healeys@autox.team.net</a>><br>
<strong>Subject:</strong> Re:
[Healeys] Overdrive pressure or
clutch slip</span></p>
</div>
<p class="MsoNormal">Â </p>
<div>
<div>
<p class="MsoNormal"><strong><u>Correct
diagnosis is 1/2 the
repair!!</u></strong></p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<p class="MsoNormal">First you need to
confirm whether the clutch (on the
flywheel) or the overdrive is
causing the slippage. </p>
<div>
<p class="MsoNormal">To do this you
ABSOLUTELY MUST disable the
overdrive as a badly misadjuster
overdrive operating valve can
produce similar symptoms. </p>
</div>
<div>
<p class="MsoNormal">To do this I
would remove the overdrive
operating valve completely. (There
are other ways but this is
absolutely definitive).</p>
</div>
<div>
<p class="MsoNormal">Now drive the
car up a long hill where you are
amle to use full throttle at
around 3000 RPM (maximum torque)
for a few seconds. If it is the
clutch (on the flywheel) that is
causing the slippage these
operating conditions. Test this a
few times to be sure.</p>
</div>
<div>
<p class="MsoNormal">If there is no
slippage we have confirmed that
the overdrive clutch is at fault.</p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">Step 1
completed. Please report
results. MS.</p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
</div>
<p class="MsoNormal">Â </p>
<div>
<blockquote
style="border: none; border-left: solid #cccccc 1.0pt; padding: 0cm 0cm 0cm
6.0pt; margin: 5.0pt 0cm 5.0pt 4.8pt;">
<div>
<div>
<p class="MsoNormal">On Mon.,
Apr. 22, 2024, 8:08 a.m. Simon
Lachlan via Healeys, <<a
class="moz-txt-link-freetext" href="mailto:healeys@autox.team.net";
target="_blank"
rel="noopener"
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:</p>
</div>
<blockquote
style="border: none; border-left: solid #cccccc 1.0pt; padding: 0cm 0cm 0cm
6.0pt; margin: 5.0pt 0cm 5.0pt 4.8pt;">
<div>
<p><span
style="font-family: 'Times New Roman',serif;">You may recall the very
extended overdrive and
clutch saga last year.</span>
<span
style="font-family: 'Times New Roman',serif;">Long story
short(ish)â?¦</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">OD was slipping in and out
depending on oil
temperature.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Correctly diagnosed
pressure. Checked with
gauge.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Attempted rebuildâ?¦going
only so far as</span> <span
style="font-family: 'Times New Roman',serif;">accumulator and related
seals.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Stymied as could not get
pump out. Turned out to
have been â??fixedâ?? at some
stage with some form of
â??chemical metalâ?? which was
coming loose/apart.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Took it up to OD Spares
who fixed it..new housing
etcetc</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Why not a new clutch I
thought? Sensible while
youâ??re in the area looking
at a 30+ yr old item.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">New clutchâ?¦no good. Noisy,
wouldnâ??t</span> <span
style="font-family: 'Times New Roman',serif;">engage/disengage/play at
all.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Gearbox out again.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Refit clutch. Presumed Iâ??d
made some beginnerâ??s
mistake.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Refit gearboxâ?¦no good.
Same</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Canâ??t recall whether I
tried again. Lost count
and enthusiasm by now.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Turned out that the new
clutch kit was defective.
(Thanks Mirek) (Genuine
B&B from AHSpares).</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">New one did work.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Saga over until
yesterday.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Same sort of
symptomsâ?¦..</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Allâ??s well for first 10 or
so miles. Then the dreaded
slippage(?) starts. But
itâ??s not quite the same.
Reminds me more of a
slipping clutch. (But NO
smell)</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Symptoms continue if itâ??s
in or out of OD.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Symptoms reduce at
speed.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Yes, plenty of oil. Over
the full mark. Looks very
clean. Pretty sure itâ??s
40wt</span> <span
style="font-family: 'Times New Roman',serif;">non-detergent topped up
with 30wt non-detergent.
(Or vice-versa).</span> <span
style="font-family: 'Times New Roman',serif;">Am confident in state of
the filter, magnets
etc.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">No, I have not pressure
tested it yet and yes, I
dread restarting the whole
bloody process all over
again. Iâ??m not sure I can
face taking the box out
again once, let alone
multiple times.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">What I want and experience
tells me Iâ??m unlikely to
get is a miracle cure!</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">One initial questionâ?¦..do
OD relays either work or
not work? ie, can the
relay hover between on and
off</span> <span
style="font-family: 'Times New Roman',serif;">which might lead to the OD
coming in and out? I think
that could happen if the
switch is off but the unit
still hasnâ??t got the
message to disengage from
the bulkhead switch.</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">And a supplementaryâ?¦.how</span>
<span
style="font-family: 'Times New Roman',serif;">do I bench test</span> <span
style="font-family: 'Times New Roman',serif;">the relay?</span></p>
<p><span
style="font-family: 'Times New Roman',serif;">Simon</span></p>
</div>
</blockquote>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<br>
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