curiouser and curiouser
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Thread: curiouser and curiouser

  1. #1
    Senior Member black nails's Avatar
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    Join Date
    Jul 2017
    The English Riviera

    curiouser and curiouser

    This afternoon, I have taken off the cam cover on my poor old 500 SL I am trying to find what was making the tapping noise back in 1993 before she was laid up.
    All previous work was done in a workshop under artificial lighting, so I am blaming this fact for missing the evidence of a camshaft repair that has been carried out at some time, on the third lobe in from the right, there is a line across the base of the lobe on both sides that looks like a very fine, straight crack, which corresponds with a slight change in colour at both sides, it looks like the lobe has been ground off and another one stuck on, to be fair, it looks good, with a good surface, and it does not look scuffed and worn.
    This corresponds with the cam follower, third one from the right, having a scuffed and scored appearance with a slight groove across it, I am sure all looked good when I put it together in 1992, I am assuming this is the culprit, but what has happened? has the lines across the cam 'planed' off the surface of the follower?
    Parts needed - 1 cam follower, and three of the weird 'o'ring diaphragms that cover the cylinder head bolt holes.
    Possibly a good camshaft.
    OR a good sei engine !!!!

  2. #2
    Junior Member
    Graham Rose
    Member #
    Join Date
    Aug 2015
    UK, Gloucestershire
    Hi, it's possible the worn camshaft has been repaired in the past by metal spraying and re-grinding. The slight difference in colour would be due to a slight difference in the colour of the sprayed steel.and what appears to be a crack is just the joint of the two metals.
    I haven't had any experience of this method of repairing camshafts but it might be worth looking into to repair the other damaged lobe(s)



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