bull pinion slop

Posted by Chris Heinzle on July 16, 2007 at 19:52:31 from (216.229.21.133):

I started to replace the drum brakes on my M, and after opening up the brake cover, found lots of grease and oil and goo underneath. The source of this goo appears to be a very trashed seal around the drum seal surface. Looking closer, I found lots of end play (.060) and lots of side play (.050) in the Bull Pinion. End play I can live with, but I think the side play is what ruined the seal. Getting the brakes working at this point meant replacing the seal and finding the cause of the side play.

It seems that the Bull Pinion is held in place on the outer end by a bearing, and on the inner end by the splines engaged in the differential bevel gear (which is inside the diff case, which is held in place by bearings on each end). The bull pinion bearing is acting as a pivot point, and the pull pinion is able to move side to side, like a seesaw moves up and down. The OD of the inner part of the bull pinion is .090 smaller than the ID of the differential case, so the only thing that could hold the inner end steady is the diff bevel gear (which it is not). So finally getting to my question, is this side play normal? Has anyone else seen it? If its not normal, what is the fix?

As it turns out there were half a dozen bad bearings on the input shaft, countershaft, and main shaft, so even if I dont get this part fixed to my satisfaction it was still worth opening the transmission up.

Replies:

• Re: bull pinion slop Bob Kerr 20:18:50 07/16/07 (5)
  • Re: bull pinion slop Bob Kerr 07:55:09 07/17/07 (0)
  • Re: bull pinion slop Owen Aaland 04:17:55 07/17/07 (0)
  • Re: bull pinion slop Harold Hubbard 04:04:33 07/17/07 (2)
    • Re: bull pinion slop chris heinzle 05:47:31 07/17/07 (1)
      • Re: bull pinion slop D Slater 08:45:49 07/17/07 (0)

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