And to add to all that Paul correctly said.... the plate thickness also
affects your choice of flywheel and throw-out bearing and clutch cover
height as the fulcrum point changes for the releaser.
Peter C
==
At 09:27 PM 1/10/2002, Paul A. Asgeirsson wrote:
>Hi Dave,
>
>Spring in the Napa valley yet? Wonderful time of year, then.
>
>The thin vs thick plate. Because the rib case trans, all, have a longer
>input
>shaft, you need to mount it on the thick plate. If you mount it on a thin
>plate,
>
>there is the possibility of not having a neutral as the input shaft might
>jam in
>the bottom of the pilot bush area against the crankshaft. Not good!
>
>If you want to mount a smooth case on an engine with a thick backing
>plate, the
>input shaft just wouldn't fit all the way in the pilot bush. Usually a smooth
>case behind a 1098 or 1275 is not a long life setup as there is more torque
>developed in these engines than the trans was designed for and it has a weak
>pocket bushing in the input shaft.
>
>Keep in mind that there are 3 types of thick engine backing plates. The 1098
>1-3/4" main, the 1098 2" main. You can use the 2" main plate on the
>1-3/4" main
>
>engine, but not the other way around. The 1275 plate is for the 1275, but
>can be
>
>used on the 1098s if you use a 1275 back plate gasket and 1275 oil pump cover.
>The 1275 has the oil pump in a different location than the 1098s but the
>bigger
>1275 cover and different gasket will work OK.
>
>The thin plates will work only on the 948 and the 1-3/4" main 1098. This oil
>pump cover is soldered in place on the plate.
>
>Does this help answer your question?
>
>Regards, Paul A
>
>
>
>David Kernberger wrote:
>
> > 1/10/02
> >
> > To the group,
> >
> > 1100 cc Spridget (maybe 1275 cc as well) engines have a thicker
> > plate between engine and gearbox than do the 948 Morris minors. I have
> > known this for a long time but only recently realized it brings up a
> > question. Does this mean the ribcase gearbox, used on 1100s and 1275s, has
> > a longer input shaft than do the smoothcase trannies used on the 948s????
> > Also, does this mean that fitting a smoothcase box to an engine with the
> > thick plate will result in a shaft which does not enter the pilot bushing
> > completely???
> >
> > Or this thickness difference taken care of in some other way, such
> > as machining material of the rear face of the engine block?? I would
> > really like to know just what the situation is.
> >
> > TIA.
> >
> > Cheers,
> >
> > Dave Kernberger
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