BMW K bikes (Bricks)

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1Back to top Go down    Drive shaft universal joint on Tue Jun 08, 2010 6:45 am

robinm

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Has any body replaced the universal joint on a K driveshaft?, if so what is the size of the universal joint? I have a shaft here that I intend to put a new spline on, but the UJ is not too good and I would like to replace that at the same time.

    

2Back to top Go down    Re: Drive shaft universal joint on Mon May 12, 2014 12:09 pm

Fliggy

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Did you ever get e reply to your post? I need to do the UJ on my drive shaft; can you give any pointers?

Many thanks.


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1991 K100RT (iC) ViN:0097731
    

3Back to top Go down    Re: Drive shaft universal joint on Mon May 12, 2014 9:21 pm

RicK G

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You need the right jig to centre the joint and at least a 10 tonne press


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Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

4Back to top Go down    Re: Drive shaft universal joint on Fri Jun 27, 2014 4:26 pm

Fliggy

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Right, I haven't got one of those at the mo. Thanks anyhow.


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5Back to top Go down    Re: Drive shaft universal joint on Fri Jun 27, 2014 6:36 pm

billtr96sn

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Having lookedat pictures of the UJ it looks no different to a standard car type on the propshaft. I have changed hundreds of those with nothing more than a drift, large hammer, a good vice and some circlip pliers. No jigs etc.


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6Back to top Go down    Re: Drive shaft universal joint on Fri Jun 27, 2014 7:12 pm

AL-58

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Its not held in by a circlip, BMW in their desire for spare parts revenue designed it to be non-replaceable.

Instead it's crimped in at the yokes.

The replacement process I've heard is:

  1. grind away the crimping
  2. press out the old UJ
  3. Press the new UJ into place being careful to centre it (you have no circlip grooves to use as a guide.
  4. place suitable sized flat washers over the end of the UJ caps
  5. Tack the flat washers into place with a MIG welder (welding direct to the UJ caps would put too much heat into them and probably damage them)


I only know this from R100GS circles where the front UJ is expected to fail from about 60,000kms onwards.

Al


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'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

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