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> From: Chris Lermanis <lermanis@netspace.net.au>
> To: triumphs@autox.team.net
> Subject: TR3 G/Box Question
> Date: Monday, October 06, 1997 4:03 AM
>
> My 3A has the habit of slipping/jumping second gear on the "over-run" _
ie
> when coming down a steep incline in 2nd with the engine braking the car.
> Is this a serious transmission problem or can I live with it till the
next
> G/Box overhaul ?
> Any suggestions as to the components that need replacement/servicing?
> Otherwise the the gear box is in good working order as is the Overdrive.
>
> Anyone have some suggestions please?
>
> Chris.
>
Chris-
Serious transmission problem...it's all relative.
Basically there are 2 reasons your car could jump out of gear when you
decelerate.
1) Bad synchro hub
2) Bad bearing between the 1st/3rd motion shaft
If you have a worn synchro hub, you can probably drive the thing for
another zillion miles before you have to "deal" with it. When the hub
wears, you can get a few miles more out of it by putting new "dogs" into it
(the little sheet metal looking things between the 2 parts of the hub)
stretching the detent springs and tightening the 1st/2nd retainer spring in
the top cover (those weird little screws in the back of the top cover).
This is usually one of those things you hear about, right up there with
oatmeal in the automatic transmission...it'll work for a while, but not
long. Since you have to dismantle the trans to do this, it's not really
worth it. You really should spring for a new hub.
You can tell if your problem is actually the 1/2 hub as the car will only
pop out of 1st or 2nd, but stay in 3rd all day. If that's what your car is
doin, you're in luck, drive on...
If this puppy pops out of 3rd even easier than it does 2nd, it's probably
the bearing between the 1st and 3rd motion shafts (input shaft and output
shaft for all us merican speakers). When this bearing gets worn it allows
the 3rd motion shaft to move somewhat in relation to the rest of the
gearset. Under power, the angle of the gears tends to pull the gears closer
together, however under decelaration it tend to push them apart. 3rd gear
is usually the first to feel the problem because it is the farthest from
any major bearing support within the gearbox and allows the most movement.
If this is your symptom, you really need to attend to this poor tranny
quite soon as it will only get worse and start to cause some real damage.
Broken gears-n-tears...
Nick in Nor Cal
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