1 Rebuild 4V Final Drive Pivot Bearings Wed Oct 16, 2013 9:14 am
duck
Life time member
Aside from the drive shaft U-joint bearings, one of the other weak links in the paralever drive train is the final drive pivot bearings. These bearings are composed of four basic parts:
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 place
None of these "sub-parts" are available individually from BMW but, if you're a packrat like me, you have saved some of these little parts and have them lying around for some day when you might need them. (Usually you need to buy part 33172311091 - a complete pivot bearing.)
Here's a final drive pivot bearing where only the outer race was present:
I had a good plastic retainer ring and enough needle bearings to assemble this. The needle bearings are held in place in the plastic retainer ring using Mobil 1 synthetic bearing grease.
Then I pushed it into the outer bearing race followed by an inner bearing race and, voila, a rebuilt pivot bearing. (Only moderate thumb pressure is required to install these.)
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 place
None of these "sub-parts" are available individually from BMW but, if you're a packrat like me, you have saved some of these little parts and have them lying around for some day when you might need them. (Usually you need to buy part 33172311091 - a complete pivot bearing.)
Here's a final drive pivot bearing where only the outer race was present:
I had a good plastic retainer ring and enough needle bearings to assemble this. The needle bearings are held in place in the plastic retainer ring using Mobil 1 synthetic bearing grease.
Then I pushed it into the outer bearing race followed by an inner bearing race and, voila, a rebuilt pivot bearing. (Only moderate thumb pressure is required to install these.)
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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT