[Healeys] Russ Thompson

[i erbs]

put a nissan 5 speed in it.

Ira Erbs
1959 100-6
MKI engine and disc brakes
excuse typos and strange words my phone wants you to see.
Portland,OR

On Aug 9, 2017 5:10 PM, "Michael MacLean" <rrengineer.mike at att.net> wrote:

> I got the idea from Russ that it would be more positive, not very
> extreme.  Just not what you are used to with the sleeve.  Of course you
> can't take my word for it.  I have no reference point as this BN2 is my
> first big Healey.  Sure wish my Bugeye had overdrive. Wow! What mileage I
> could get out it then!
> Mike MacLean
>
>
> On Wednesday, August 9, 2017 12:30 PM, Bob Spidell <bspidell at comcast.net>
> wrote:
>
>
> Good info!  Just how much harsher is engagement with the larger
> accumulator?  As one who always tries to shift as smoothly as
> possible--without slipping the clutch much, if any--is engagement so harsh
> as to require a slip of the clutch which, of course, will contribute to
> clutch wear?  If clutch isn't used, is engagement so harsh as to be a
> 'shock' to the drivetrain; i.e. U-joints, splines, differential gears?
> Bob
>
> On 8/9/2017 5:58 AM, Ed O'Neal wrote:
>
> Mike,
>
> The original OD design used a 1 ¾” accumulator piston with a concentric
> double spring.  This configuration was used in a lot of different vehicles
> including the Triumphs.  Donald Healey didn’t like how the OD engaged
> harshly when the clutch was not used during the shift.  He changed the
> design to incorporate a sleeve fitted in the 1 ¾” bore with a smaller 1
> 1/8” accumulator piston inside of the sleeve and a single spring.  This
> gave a slower engagement much like a modern automatic transmission.
> However, as the OD wears the internal leakage increases and the OD will
> engage very slowly or not at all.  Using  the larger accumulator is a good
> idea (in my opinion) and will delay the point when internal leakage causes
> a problem.
>
> Ed
>
> ed at wadsworthoneal.com
>
> Edward J. O’Neal, P.E., Pte.
> Wadsworth O’Neal Associates, Inc.
> 6418 Commerce Park Drive
> Fort Myers, Florida  33966
> phone:  (239) 245-8728
> cell:        (239) 410-6174
>
>
> *From:* Healeys [mailto:healeys-bounces at autox.team.net
> <healeys-bounces at autox.team.net>] *On Behalf Of *Michael MacLean
> *Sent:* Tuesday, August 08, 2017 8:47 PM
> *To:* Healey List
> *Subject:* [Healeys] Russ Thompson
>
>      Through a reference from the list I am having Russ Thompson in
> Northridge, California rebuild my BN2 transmission.  It is a low mileage
> (10,000 mi. approx) transmission, but I wanted to be able to put it in and
> not have to take it back out again.  Good thing I took this precaution.
> Russ found the overdrive stuck and would never have worked.  Today he
> showed me the accumulator piston.  The smaller center piston was scored
> from dirt or crap in the oil.  Russ replaced it with a one piece piston
> from a Triumph overdrive.  There was a huge spring below it.  Anyone heard
> of this?  He said engagement will be real positive now.  Even with the low
> mileage, the number 2 synchro was toast and will be replaced.  The other
> two were fine and will be re-used.  All the gears showed very little sign
> of wear.  The reverse gear had some surface rust on the teeth, but that can
> be blasted and it will be fine.  Getting closer to having the drive train
> is the car.
>      I know I am going to start a discussion, but Russ recommends using
> 40wt motor oil for the transmission.  Anyone know what weight Redline MTL
> is?
> Mike MacLean
>
>
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