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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