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Normal Topic Pawl Spring Victory! (Read 42 times)
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Posts: 27
Location: Cranston, RI
Joined: 03/27/20
Gender: Male
Pawl Spring Victory!
09/01/20 at 20:12:06
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Well, after some snafu's ordering from Motobins, my parts finally came in.  I decided not to make my own puller in the interest of time.  I found a new Matra puller locally for a comparable price to the cycleworks puller.  I know the cycleworks tool is good (and maybe even easier to use), but there's something sexy about factory special tools.

The rear input shaft bearing has a very slight raspiness, but not enough to halt the job.  Here are some pics at the halfway point.  I got the job done in a workday, including new seals, boots, and a little rustoleum brushed on the frame to quell some of the rust that has developed in hard to reach areas over the years.

P.S. I wonder how much re-shimming is actually required when you change only bearings. The bearings in our transmissions are probably manufactured to ten-thousandths of an inch tolerances.  I suspect the shims make up for rear cover machining more than anything else
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Tony Smith
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Graduate, Wallace and
Gromit School of Engineering

Posts: 2265
Location: Cairns, Australia
Joined: 07/23/13
Gender: Male
Re: Pawl Spring Victory!
Reply #1 - 09/02/20 at 17:14:52
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You are correct in respect to the manufacturer's tolerance, particularly if you use the same brand of bearings you find in the gearbox.


On the couple of functioning gearboxes I have pulled apart of other reasons (eg broken pawl spring, dropped oil channel etc) I reckon BMW (or Getrag) set them up on the tight side.

As I prefer to rebuild with semi-sealed bearings a re-shim is mandatory.

Cycle works is an excellent source of shims, much cheaper than BMW

1978 R100RS| 1981 R100RS (JPS) | 1984 R65 | 1992 KLE500 | 2002 R1150GSA |
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