RICHARD.JACKSON@NENE.AC.UK wrote:
>
> >Richard J. writes:
>
> >>While we're on this subject, and while Mr Storm ain't about, is it possible
>to
> >>change the bearings on the Pinion, or does it require ripping the shit out
>the
> >>diff, and then special(S-T Part No-666)(Note the number) tools to replace
>it?
> >>Come on Barry, you must know(well, I thought Andy was getting too much
> >>attention!) :-)
> >**********************************
> >Well O.K., since you asked -
> >Yes it's possible to replace the bearings on the pinion but your talking
> >about a COMPLETE rebuild. You must dissemble the diff almost completely.
> >Then, since you are replacing the bearings and the tolerances ARE going to
> >be different you will have to re-shim the pinion head-to-bearing to get
> >correct gear mesh. In other words, a whole lotta work. (Just went through
> >this last weekend in setting up the Quafie). It might be possible to
> >replace the (front - smaller) bearing without disturbing any settings
>
> But what the hell is a case spreader thingy that I've read about?
>
> Rich
-------------------------------------------------------
RICH AND BARRY
Since most if not all production and aftermarket diff cases are within
the production tolerances and tend to be on the nominal side, it should
not be an issue as for setting up the diff on a spit or a TR6. I just
finished installing a Detroit Locker in my early 1970 diff assy and this
is an early locker originally for the TR3. The unit fit perfectly I had
the right preload on the bearings and the most important factor was I
retained the proper ring to pinion tooth pattern (matched the original)
and my backlash was in spec.
Point is that I an others have done this on a number of triumphs and I
know quite a few Jeeps that recieved just lockers or True tracks and the
same is true. I know two guys that works for our company (brand x motors
in the drivetrain engineering lab) that do them daily and on the side
and they usually don't need any attention as far as changing shim
selections. There are, however, exceptions to the rule!
As for the case spreader thingy. They are available but not puchased or
generally used because you don't need them. Light pressure, upwards,
with a small prybar or large screwdriver will remove the assy with the
carrier bearings from the diff housing. When re installing set the ring
gear assy with the carrier bearings in the diff housing and set the
bearing cups on a slight angle outboard on each side. Gently send them
home with a soft faced hammer.
Remember when removing the case caps you should mark the caps and the
corresponding part of the carrier with a center punch mark to assure
they are in the right location.
If you plan on changing the ring and pinion you WILL have to completely
set up the diff assy. You will need to set pinion depth/preload as well
as shim behind each carrier bearing to provide the proper tooth pattern
and backlash.
Good luck
Glenn Franco
71 and 74 TR6 (70's drivetrain stuff/prepared auto x car)
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