1998 S70 Alternator Bearing Change DIY

Volvo S70 made a high pitched noise which was proportional to the engine rpm, the fix was Alternator Bearing Change.

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Atis writes a very detailed Bosch alternator rebuild with great pictures

I had a problem with noisy alternator bearings. The symptom was a high pitched noise which was proportional to the engine rpm, but higher. For me it seemed like some plastic is rubbing on another surface. It occurred only when the engine was cold and the car was sitting for some days. Later it occurred at every cold start.

1998 S70 Alternator bearing change