1/13/02
Paul, Peter,
Thanks for your responses. Not spring here yet but the first tree
blossoms usually show up about mid-February.
30 years ago, I rebuilt my first Spridget 1100 engine (10CC engine
number prefix--2" main bearings) to put into my 61 Morris pickup. I had no
ribcase trannies but had plenty of smoothcase ones. So, in spite of
warnings of lack of strength, I decided to try using a smoothcase. I
figured I could always acquire a ribcase unit if the smoothie did not work
out. I did the same thing for my 61 Van about 3 or 4 years later. Over
all those years I have not encountered any problems due to transmission
weakness. They are both still going strong. Engines are stock and I am
not a hotrodder though I do occasionally wind my way through the gears just
for the heck of it.
When setting up the first one, I found need to do a small bit of
grinding inside the clutch housing to clear the clutch. Also, I determined
that the clutch throwout arm would have to be bent a small amount but that
all worked out just fine. The question of shaft length and pilot bearing
fit never occured to me until just now (2002). I do not recall ever
hearing anybody address the issue before nor do I recall seeing it in any
Minor News or Minorgram. I just left the thick plate on and never gave it
any thought. On the van I just repeated the earlier procedure.
So I guess I am a bit lucky, though obviously it would be more
support for the input shaft and more wearing surface for the pilot bearing,
if that shaft went all the way home. We have traveled many long trips in
these cars, so my experience is based on more than just short commuting.
If I tried using the thin 948 plate on this combination, it appears
I would have even more clutch/housing interferance. Meanwhile you say it
won't fit the 2" main 1100 blocks. Is this because the soldered oil pump
cover is not deep enough??? Nor do I understand when you say the 1275 oil
pump is in a different location. Aren't all A series oil pumps at the rear
end of the camshaft??
So, what better way might there be to mate the smoothcase tranny to
the 2" main 1100 cc engine? Maybe the only real solution would be to weld
an extension on to the input shaft and machine it down for a correct fit in
the pilot bearing.
Thanks in advance.
Regards,
Dave Kernberger
------------------------------------------------------
>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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