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Bearing noise

posted by  stonybrook on  Wed Oct 26 09:57 CST 2016
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last visit: Sat Sep 6 12:30 CST 2014
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One of the items that run off the Serp. belt has a noise..
When I remove the belt and turn the pulleys by hand, and can't determine which device it is. I thought it was the tensioner pully, swapped it out, no change.
The power steering pump is the only device which has a tiny amount of play at the pully. Any foolproof methods for diagnosis, I have a stethiscope ( normal kind ) and I can hear the problem at all devices because they are all connected to the engine and the scope is so sensitive.








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    Bearing noise

    posted by  KlausC on  Thu Oct 27 13:48 CST 2016
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    last visit: Fri Oct 24 10:15 CST 2014
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    If you spun all of the driven devices and didn't detect any vibration, there is always the idler. A 'wobbly' PS pulley is also a no-no and is probably the source. Putting tension on the belt will put a lot of pull on the PS pulley and that could make the noise.

    Using a stethoscope requires a keen ear. Place it on the PS pulley center and follow that with different pulley and back again. It might only be a decibel or two different.
    --
    Keeping it running is better than buying new








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    Bearing noise

    posted by  boxvolvo on  Wed Oct 26 14:02 CST 2016
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    last visit: Fri Oct 24 04:28 CST 2014
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    Don't know if this is foolproof, but it's worked for me. With the engine running, pour or spray a small amount of water into the center of each pulley wheel in succession. You'll know you've got the bad bearing when the noise goes away.







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