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Old 01-06-2004, 11:43 AM
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'92 300e 2.6 airpump grinding noise?

What generally fails on the airpump that produces an awful bearing grinding noise?

Any MB quality rebuilt units available?

tks-fad

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Old 01-06-2004, 12:01 PM
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The bearings on the pulley shaft themselves...

...in some cases they will seize up causing the pulley to lock up and shred the serpentine belt.

Rebuilt pumps are available from various sources as the bearings themselves are not readily available. This may be more of a deterrent for a DIY'er wanting to rebuild the pump since it is a smog-related component.
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Old 01-06-2004, 01:40 PM
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thanks G-Benz for the info!
-fad
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Old 01-06-2004, 05:59 PM
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I don't know if it applies in the MB case, but the typical cause of air pump failure is a bad check valve allowing hot exhaust to backflow into the pump. Replacing those at the same time is good practice.

Steve

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