[Healeys] Mating the overdrive to the transmission

[Michael Salter]

Well that's a new one on me Bob. I have installed dozens of overdrive units
and never encountered that problem.
Obviously it would tend to indicate some kind of dimensional difference
between the 2 gearbox shafts but I'm sure that you would have checked that.
Please let me know if you find out what the problem is.

M


On Tue, Jun 20, 2023 at 10:15 AM warthodson at aol.com <warthodson at aol.com>
wrote:

> Michael,
> We do have a spare trans output shaft & we have watched your video & made
> a wire tool to retract the pump plunger. We have verified that the plunger
> is fully retracted & the splines are aligned. The spare shaft goes in about
> 1/2" (all the way in) further than the one that came out of the car.
> Gary
>
> On Tuesday, June 20, 2023 at 07:12:20 AM CDT, Michael Salter <
> michaelsalter at gmail.com> wrote:
>
>
> Although one may be difficult to find there is no substitute for a spare
> gearbox 3rd motion shaft for this job.
> The spare shaft is used to align all the internals then, using my special
> tool to hold the pump plunger retracted
>
> https://precisionsportscar.com/laycock-de-normanville-overdrive-installation-tool/
>  it is a simple task to lower the overdrive onto the gearbox.
>
> M
>
> On Mon., Jun. 19, 2023, 11:41 p.m. Bob Spidell, <bspidell at comcast.net>
> wrote:
>
> There is a bronze thrust washer that has to be perfectly centered to get
> that last 3/4" (#148 in this diagram):
>
> https://mossmotors.com/ahy-041-overdrive-unit-bn2-thru-bj8
>
> You can wiggle it around with a long screwdriver, or use a suitable
> 'drift' to center it. Your best bet is to sit the O/D on end and lower the
> gearbox onto it; gently rotating the gearbox while lowering. First time I
> did this I must have got lucky, but danged if I can explain this (see
> attached photo). Most recently I fought for a couple days then threw in the
> towel and took gearbox and O/D to BCS which, fortunately, is only a
> half-hour away. David and his mechanics had a novel technique I've not
> heard described anywhere; basically, he removed the pump completely--it's
> only two screws IIRC--and split the O/D into front and rear sections and
> tipped the gearbox and O/D up--gearbox on bottom--then had two of his
> mechanics pull the sections together with huge channellock pliers while
> David rotated the output shaft to 'feel it in' (you had to be there).
>
> Good luck. Make triply sure you have the pump cam oriented correctly, or
> you'll get more experience with this process than you probably want.
>
> bs
>
> On 6/19/2023 6:18 PM, warthodson--- via Healeys wrote:
>
> I spent the day assisting a friend trying to mate his OD to his
> transmission. The car is a '63 BJ7. The overdrive & Trans. were pulled to
> replace a few internal trans parts which was done & we did not run into any
> issues. We can get the OD to within approx. 1/2-3/4" of mating to the
> trans, but cannot close that gap. We have confirmed that the oil pump
> roller has been fully retracted. What are we bumping up against & how do we
> get past it?
> Gary Hodson
>
>
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