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Cam gear runout (wobble) causing annoying sound

posted by  Bill1959 on  Wed Nov 4 22:07 CST 2015
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last visit: Wed Sep 17 20:59 CST 2014
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Had subtle (but annoying) engine sound ever since I bought vehicle, somehow missed it when test-driven, but as I said somewhat subtle; Buddy has same vehicle, no such sound on his (he DID notice difference; when we drove both, one after the other). Sound is wah-wah-wah-wah .. (best I can describe) which increases in frequency with engine speed. Not normal. Annoying.
Finally traced (I hope) to runout in cam gears, visually quite noticeable while engine running. Causes tensioner "ear" to oscillate 1/16 inch or more total, I'm thinking that's excessive? Noise definitely same frequency as cam shaft rotation and tensioner oscillation.
Anyone experienced this, and played with eliminating runout of cam pulley teeth? (Of course, if pulley adjustment in slots (I have VVT's) happened to be needed for timing, runout efforts would be for nought; but I'm thinking such timing adjustment is not normally necessary?)
You may be thinking, "wow, this guy's got way too much time on his hands"; but honestly, this noise is eating my lunch.
THANKS IN ADVANCE.
(Please don't suggest I turn volume up ..)
--
2007 S60T5 6-SPEED








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    Cam gear runout (wobble) causing annoying sound

    posted by  B.B. on  Fri Nov 6 17:33 CST 2015
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    last visit: Mon Oct 6 13:15 CST 2014
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    Hi Bill,

    That's an odd problem.
    How old is the timing belt? would be my first question.
    Perhaps the belt thickness is not uniform? Maybe a bad T-belt?

    You could perhaps check for runout on the camshaft sprockets with
    a dial indicator, maybe with the belt in place? See if one or both of
    the cam sprockets have excessive runout.

    Bill








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      Cam gear runout (wobble) causing annoying sound

      posted by  Bill1959 on  Thu Nov 19 18:42 CST 2015
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      last visit: Wed Sep 17 20:59 CST 2014
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      Thanks for reply,

      Brand new belt and tensioner. I will check gear runout with indicator, as you suggest. Not sure what the spec is for this runout, but as I say, it sure looks excessive by eye.
      --
      2007 S60T5 6-SPEED








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    Cam gear runout (wobble) causing annoying sound

    posted by  Chris Mullet on  Fri Nov 6 08:35 CST 2015
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    last visit: Fri Oct 24 09:08 CST 2014
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    Does this guy's problem sound anything like your situation?

    http://www.matthewsvolvosite.com/forums/viewtopic.php?f=9&t=72792&view=unread#unread

    --
    Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (fixed the ignition - now back to the brakes again)








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      Cam gear runout (wobble) causing annoying sound

      posted by  Bill1959 on  Thu Nov 19 18:39 CST 2015
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      last visit: Wed Sep 17 20:59 CST 2014
      [RELATED]

      Thanks for reply,

      Link speaks about exhaust hub/pulley having movement. My belt is running true; not weaving from side to side.
      --
      2007 S60T5 6-SPEED







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