5 speed ribbed tranny rebuild

[robert]

Howdy Jeff, how was the road test?

Struth! I'm not that quick.
Ashly, I'm whipping the cover off again. Not happy with it. Input shaft should be easier to turn as is evident when I undo all the cover bolts. Bit tight there somewhere....
Oh well. I'll get it.

Before you open it up, give the input shaft a sharp rap with a mallet. That may settle things and loosen it up. If not, reduce the shim stack by .004".

[ME 109]

Thanks Robert, I've just taken the cover off.

It seems to come down to the bolts on the output shaft side.....when they get tightened the input shaft stiffens up.
Time to remeasure my remeasuring.
I've been able to get the shim stacks very close to what I thought was needed so there must be an error in my measurements.
I'll get it.

[Garnet]

And maybe reheat the whole box to make sure the other ends of the shafts are properly bedded.

Edit: as long as Mrs Jeff has nothing else in the oven.

[robert]

Thanks Robert, I've just taken the cover off.

It seems to come down to the bolts on the output shaft side.....when they get tightened the input shaft stiffens up.
Time to remeasure my remeasuring.
I've been able to get the shim stacks very close to what I thought was needed so there must be an error in my measurements.
I'll get it.

Seems as if the cover is low in the center,---very common-- if the output shaft is free when the cover screws are tight,reduce the shim stack on the input shaft. Just warm the cover with a propane torch, no need to put it in the oven.
Sometimes on these old machines there is enough distortion in the case and cover that you have to play it by ear. Loose is good, tight is not.

[Major Softie]

And maybe reheat the whole box to make sure the other ends of the shafts are properly bedded.

Edit: as long as Mrs Jeff has nothing else in the oven.

Mrs. Jeff has a something in the oven????????

[ME 109]

And maybe reheat the whole box to make sure the other ends of the shafts are properly bedded.

Edit: as long as Mrs Jeff has nothing else in the oven.

Mrs. Jeff has a something in the oven????????

Mrs. Jeff did have actually, but she took it out and we ate it for tea.

The electric heat gun is a good tool for heating and removing/installing the cover.
The cover is slightly bowed.... I realised that early in the piece.

Seems my troubles came from aiming for just under .05mm, and averaging measurements.
I have read that the method is to take four or more measurements for each bearing and then use an average as your base measurement.
Looking back, I can see that is the wrong thing to do.
Multiple measurements around the cover plate bearing pockets and shim plate, and essentially use the shallowest measure from the cover, and the shallowest from the shim plate.

I got it back together using reassessed measurements and the input shaft spins freely.
I believe all end plays are at .05mm and my shim assortment allowed me to match my measurement requirements.

I'm ready for Charlies tranny now.

The proof will be in the puddin'

[Deleted User 287]

Sunday pudding?

[SteveD]

Howdy Jeff, how was the road test?

Well

[ME 109]

Howdy Jeff, how was the road test?

Well

Ducati Pete's spare tranny is still in my bike.

And I need to find a 220NM torque wrench.

A test ride is a little way off, but thanks for asking Steve.

[georgesgiralt]

Hello !
You can add a length to the wrench you have and, thus, reduce the setting on the torque wrench you have and still get the 220~ 240 Nm at the bolt.
It is the same rationale than the one you use when torquing the difficult to reach 12 side bolts on the shaft drive... Just a bit longer. Having an extension could be way cheaper than buying a torque wrench just for one bolt ...