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    Strange vibration - Help diagnosing needed!

    Got the rebuilt alternator back from the shop and installed it. Vibration is gone. The guy who rebuilt it said the it was roasted inside and there was too much damage to replace bearings. Interestingly he said it was never pressed together correctly from the factory and this was the original...
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    Strange vibration - Help diagnosing needed!

    This is a great write up! Thanks very much! I did a little more testing on the alternator and found the overrunning pulley working as intended(only spinning one direction) but an abnormal amount of shaft play(up and down). I looked around online for an alternator and went down that rabbit...
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    Strange vibration - Help diagnosing needed!

    I hand spun all the pulleys and don't get any rough bearing feel. The alternator pulley does have some play up and down, but otherwise feels smooth. Is that normal? If it is, I will replace the belt, start it and do some stethoscope testing.
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    Strange vibration - Help diagnosing needed!

    Removed the belt and vibration is gone. None of the pulleys are wobbling. I replaced the lower pulley since it had a little bit of wobble, but the new one had the same slight wobble. Any tricks to testing the water pump, a/c compressor, p.s. pump?
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    Strange vibration - Help diagnosing needed!

    Just picked up a new to me 2005 S197. There is a strange vibration on the top end that sounds like the spin cycle on a washing machine. Hoping to get a few ideas. I replaced the spark plugs, cleaned the throttle body and cleaned the MAF. The motor only has 66k miles. Could this be CAM phasers...

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