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Thread: Timing chain help

  1. #1
    Registered User photorider's Avatar
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    Timing chain help

    I'm in the middle of replacing my timing chain and after cutting the old one, I did something stupid and got the sprockets all misaligned. I can turn the crank fine by bumping the wheel but I can't seem to move the cam sprocket to get it aligned again. Is there a trick to this? What am I doing wrong? Many thanks for any help.
    76 R60/6
    97 R80GS

  2. #2
    Registered User 88bmwjeff's Avatar
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    Grasping at straws here a bit, but have you loosen the adjuster nuts on the valves to remove the tension? I would think that would make it easier to rotate the CAM shaft.
    Jeff in W.C.
    1988 R100 RT (the other woman)
    "I got my motorcycle jacket but I'm walking all the time." Joe Strummer

  3. #3
    Registered User skiteach's Avatar
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    Quote Originally Posted by 88bmwJeff View Post
    Grasping at straws here a bit, but have you loosen the adjuster nuts on the valves to remove the tension? I would think that would make it easier to rotate the CAM shaft.
    Safest way I can think of!
    '73 R75/5
    Never had a bad day skiing!

  4. #4
    Registered User photorider's Avatar
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    I did loosen the adjuster nuts on the valves and that created some free play but not enough to spin it the 180 degrees it needs to go.
    76 R60/6
    97 R80GS

  5. #5
    Registered User skiteach's Avatar
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    Rocker arm removal.
    '73 R75/5
    Never had a bad day skiing!

  6. #6
    Registered User mneblett's Avatar
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    Quote Originally Posted by skiteach View Post
    Rocker arm removal.
    Agreed -- as you remove the rocker arms, take care to not allow them to slide off their shafts -- that will allow release of a gazillion tiny needle bearings (the needles are not caged -- thanks, BMW!) the rockers ride on -- 1/3 of which will, of course, roll immediately into several deep dark recesses of your workplace. The individual needles are frightfully expensive to purchase.
    Mark Neblett
    Fairfax, VA
    #32806

  7. #7
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    Turn the crankshaft to get the pistons about half-way down the bores to avoid bending a valve, then grab the cam sprocket with a large pair of Channel Lock pliers. You'll be able to rotate the camshaft pretty easily with them. Finally, rotate the crank back to TDC, align the marks and finish the job.

  8. #8
    --Tony AnnapolisAirhead's Avatar
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    Quote Originally Posted by mneblett View Post
    ... -- 1/3 of which will, of course, roll immediately into several deep dark recesses of your workplace. The individual needles are frightfully expensive to purchase.
    I'll bet that's where all my missing parts are...
    '83 R100RT'd
    '71 R75/5 SWB
    '06 KLR 650

  9. #9
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    Your missing socks are there, too.

  10. #10
    Registered User photorider's Avatar
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    Thanks for all the replies. I decided to with the easiest approach first. Lostboy, I took your suggestion and it worked great. Didn't even need the pliers.
    76 R60/6
    97 R80GS

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