[Healeys] Overdrive pressure or clutch slip Step 2!

Thu Apr 25 11:00:06 MDT 2024

Simon,

What have you done to rule out the O/D relay (the one on the scuttle). 
I've had them go intermittent.

Bob

On 4/25/2024 9:29 AM, Simon Lachlan via Healeys wrote:
>
> So, here is Michael’s “Step 1” 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 rpm…..no
>     slippage at all.
>  2. Had a puncture…..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 I’m convinced that I’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 “click” when it should and engages the OD
>     when activated.
>
> So what’s a sensible “Step 2”??
>
> I have been urged to check the setting of the Throttle Switch (TS). 
> Assuming that the slippage returns (and why wouldn’t it?), I’ll short 
> the TS out to see if that fixes it. If it does, I’ll check the adjustment.
>
> Suggestions would be more than welcome……I do dread having to take that 
> box out again. I’ve got a very adequate ramp and a very strong 
> volunteer(?) but, regardless of all that, it’s still quite a task. 
> And, like a few of us, I’m not as young as I once was. I’ve always 
> enjoyed the lines from the manual which I reproduce, below. “Gently 
> ease”!?!
>
> Thanks, Simon
>
> *From:*Michael Salter <michaelsalter at gmail.com>
> *Sent:* Monday, April 22, 2024 3:21 PM
> *To:* Simon Lachlan <simon.lachlan at alexarevel.plus.com>
> *Cc:* Healeys <healeys at 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 at autox.team.net> wrote:
>
>         You may recall the very extended overdrive and clutch saga
>         last year. Long story short(ish)…
>
>         OD was slipping in and out depending on oil temperature.
>
>         Correctly diagnosed pressure. Checked with gauge.
>
>         Attempted rebuild…going only so far as accumulator and related
>         seals.
>
>         Stymied as could not get pump out. Turned out to have been
>         “fixed” at some stage with some form of “chemical metal” 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 you’re in the
>         area looking at a 30+ yr old item.
>
>         New clutch…no good. Noisy, wouldn’t engage/disengage/play at all.
>
>         Gearbox out again.
>
>         Refit clutch. Presumed I’d made some beginner’s mistake.
>
>         Refit gearbox…no good. Same
>
>         Can’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 symptoms…..
>
>         All’s well for first 10 or so miles. Then the dreaded
>         slippage(?) starts. But it’s not quite the same. Reminds me
>         more of a slipping clutch. (But NO smell)
>
>         Symptoms continue if it’s in or out of OD.
>
>         Symptoms reduce at speed.
>
>         Yes, plenty of oil. Over the full mark. Looks very clean.
>         Pretty sure it’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. I’m not
>         sure I can face taking the box out again once, let alone
>         multiple times.
>
>         What I want and experience tells me I’m unlikely to get is a
>         miracle cure!
>
>         One initial question…..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 hasn’t got the message to
>         disengage from the bulkhead switch.
>
>         And a supplementary….how do I bench test the relay?
>
>         Simon
>
>
> _______________________________________________
> Support Team.Nethttp://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Archive:http://www.team.net/pipermail/healeys  http://autox.team.net/archive/healeys
>
> Healeys at autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage:http://autox.team.net/mailman/options/healeys/bspidell@comcast.net
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20240425/71d98ded/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 24198 bytes
Desc: not available
URL: <http://autox.team.net/pipermail/healeys/attachments/20240425/71d98ded/attachment.png>