One of the weak links in the
paralever drive train is the final drive pivot bearings.
These bearings are composed of four components:
1) Outer race that installs in
the final drive housing
2) 20ish needle bearings
3) A plastic ring that holds the
needle bearings in place - this is the part that usually
fails and is the weak link
4) Inner race that holds 2 & 3 in
None of these parts are
individually available from BMW. To get a complete pivot
bearing you need to buy part 33172311091 (about $68 USD new
from a dealer.) However, I happened to have saved some
of these little parts lying around and had enough on hand to
rebuild a couple of final drive pivot bearings.
According to the BMW parts catalog this is a 10X32X17
bearing so with that data you might be able to find a
generic replacement. Rubber Chicken Racing also makes
replacement pivot bearings ($140/pair) that are
supposedly superior to the OEM ones.
This bearing only had the inner
race remaining in the left final drive pivot:
I had a spare good plastic needle
bearing retainer ring and some needle bearings on hand so I
assembled the following, using Mobil 1 synthetic bearing
grease to hold the needle bearings in place:
Then I pressed it (by hand) into
the outer bearing race and then inserted an inner bearings
race. Voila! The finished product:
© 2013 Drake Smith - Please do
not use or reproduce this elsewhere. Feel free to link
to it though.