Lotus Elan

4-Speed Gearbox help please

PostPost by: Craven » Thu Dec 17, 2015 3:57 pm

May explain the difference in feel between gearboxes. Pic shows a reverse selector rod from an earlier box and a rod used for one with reverse light switch operation ( bottom ).
Hopefully you can see there is a marked differences in the detent ball locations, the later ( switch ) type they are 1/ same size. 2/ much deeper.
Similar differences can be seen in the other two rails.
p1020927.jpg and
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PostPost by: TroonSprint » Thu Dec 17, 2015 7:16 pm

Rohan, thanks for the copies of pages 18 & 19. I'll print them out and add them to my manual.
Craven, how interesting! I wonder why the detents were made deeper. Was there an issue with jumping out of gear as Rohan's manual suggests?
Whatever, I'm not about to remove engine and gearbox to check those detent springs! I can live with having to knock it out of reverse now that I know the problem is not just on my car.

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PostPost by: elj221c » Mon Dec 21, 2015 4:31 pm

TroonSprint wrote:Part No. 36 T 327
March 1970.

Is this not an official Lotus manual?


I'm sure it is. However, my February 1970 36 T 327 is as Rohan's.

You just have the wrong month, Mike!

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PostPost by: CBUEB1771 » Sun Dec 27, 2015 5:49 am

My Elan Workshop Manual (36 T 327, March 1970) has no Section F.5 and so does not address "jumping out of gear" or the detent spring shims. I also have two +2 Workshop Manuals and these differ. The older one (50 T 327, September 1969) also has neither Section F.5 nor discussion of the shims. However the later +2 manual (X050 T 0327Z, September 1974) does have Section F.5 and the discussion of shimming the detent springs. My mid-1971 +2S has always had detent spring shims fitted. It is not obvious when the "jumping out of gear" problem was introduced. Maybe with the introduction of the snap-ring style main shaft? Could that design allow a little more end float of synchro hubs than did the draw nut design? My +2S has the snap-ring style main shaft. Back to the original topic, getting in and out of reverse has always been easy on my +2S, basically the same, light force being required on the gear lever going in or out.
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