1989 Cadillac Alternator Rattle

1989 CADILLAC
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POPPAROCKS
  • MEMBER
  • 3 POSTS
i thought my alternator belt may have rattled something loose or it may need an adjustment, but after going back and looking at it realized its the alternator making the loud, rattling noise. it appears the plate against the rotor has been making contact and may be a bit loose. i will try to tighten tonight, but if it doesnt solve the problem, could it be that the bearings of the rotor are the issue? if so, is it easier to just replace the alternator as a whole or mess with the bearings? in addition, since the belt is so tight, whats the best way release the tension to replace the alternator?
Apr 12, 2006 at 2:42 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
The belt tensioner is a bit lower than the alternator. Locate it and release the belt. (there is a drawing either on the hood or radiator suport of the belt routing) The only fix is to replace the alternator.
Apr 12, 2006 at 5:18 AM
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Suggested Repair

Locate the belt tensioner below the alternator and release belt tension using the routing diagram on the hood or radiator support. Replace the alternator; that is the only recommended fix for the rattling rotor contact.

Conversation Summary

The owner of a 1989 Cadillac reported a loud rattling alternator and suspected the plate against the rotor was loose or the rotor bearings were failing. They asked whether to repair the bearings or replace the unit and how to release a tight belt. The expert said to locate the tensioner below the alternator, release the belt using the routing diagram, and replace the alternator.

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