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Engine rattle from something attached to alternator belt


Scotland North AR

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Evening all, very irritating problem on 2009 150 Sigma SV, circa 60,000 miles.

The engine started rattling, take the alternator belt off and it stops. Changed belt tensioner for new one, also the idler below the cams, water pump changed, had alternator sent away stripped and checked, all ok.

Feedback from alternator person was that the belt was worn. This belt had done 11,000 miles since change. Belt changed also.

The only thing which is now 60,000 miles old is the damped crankshaft pulley. Brief inspection with light on mirror on a stick didn't seem to show the rubber perishing or damaged in any way when looking from the engine side towards the nose.

I'll be getting another pulley to try but any other thoughts from anyone as to further checks I should do or possible causes?

The belt wear may be an indication that something is not entirely right with the crankshaft pulley?

Answers on a post card to.,,,

 

 

 

 

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Morning, tried all of the above. Had car up on stands, checked everywhere with mirrors and lights, straight edge across pulleys. Checked tightness of everything. Am now borrowing another alternator, trying that, then change the crankshaft pulley/damper.....and after that....

Thanks for the advice to date, will update mid next week when I've done the above. Very pleased it's not mid season!

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.......and......

The story so far: -

alternator belt tensioner and pulley assembly changed

central idler changed

alternator belt changed

alternator pulley found to be worn down from 55 mm diameter to 53 mm diameter at the top of the grooves when compared to new pulley. The peaks of the teeth seem to have worn down after 11,000 miles. Changed the pulley and refitted existing alternator. Alternator is a small WOSP unit.

Checked all of the bolts.

Still rattling with the alternator drive belt on when running, quiet with the belt off!

Tomorrow a new crankshaft pulley goes on!

Can't help but think it will be something embarrassingly simple after all of that :(

 

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