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DRIVE BELT KEEPS BREAKING - BECAUSE OF WHAT ?

 
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Old 13 Jan 2013, 05:38 am
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Default DRIVE BELT KEEPS BREAKING - BECAUSE OF WHAT ?

Hi - New to the forum so hello to all from the UK.

Help required -UK based PT owner having issues with drive belt breaking - twice in 3 weeks.

Car PT 2.2 CRD 2006

Having had one belt replaced and another replaced at garage three weeks later i have been told the alternator is faulty ?? either over heating and "Burning the drive belt over time until it breaks" or the alternator clutch is faulty which is causing the pulley to stick" ??

Are any of these likely ?

On both occasions the belt broke - Initially the battery light came on, burning smell, then belt shreaded, rendering car imobile due to no power stearing.
Both occasions it was COLD ( around or just below freezing )

Pulleys

1. Air con pulley - On both occasions no are con on so no load on belt. - could this still be an issue ?
2. water pump pulley - belt runs over this pulley on the the back of belt ( not the grooves) and all the damage appears to be on the groove side - So assuming if this pulley was sticking there would be damage/burn marks on the back of the belt and it looks fine ( checked coolent - all OK ) - any suggestions
3. Tensioner - ??
4. Driveshaft - ??
5. Alternator. - ??

The Mechanic is 80% sure its an alternator issue so prior to making a decision to change ( and spend 's ) thought i would ask opinions. all comments appreciated - many thanks.
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Old 13 Jan 2013, 09:54 am
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Default Re: DRIVE BELT KEEPS BREAKING - BECAUSE OF WHAT ?

If you change the alternator, change the overrunning pulley as well...especially if the mileage is greater than 60000 mi (100000km).
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Old 13 Jan 2013, 12:01 pm
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Default Re: DRIVE BELT KEEPS BREAKING - BECAUSE OF WHAT ?

Cheers for the reply Carl48, noted overunning pulley, still not convinced its the alternator though ??
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Old 13 Jan 2013, 12:35 pm
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Default Re: DRIVE BELT KEEPS BREAKING - BECAUSE OF WHAT ?

Quote:
Originally Posted by bluezoo View Post
Cheers for the reply Carl48, noted overunning pulley, still not convinced its the alternator though ??
when you remove the alternator, spin the pulleys :-) if one is stuck, probably will be easy to tell.

Also if the tensioner is too loose or to tight it could also cause the belt to shear if it is out of alignment over the pulleys :-)
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Old 13 Jan 2013, 01:18 pm
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Default Re: DRIVE BELT KEEPS BREAKING - BECAUSE OF WHAT ?

More likely the overrunning pulley than the alternator itself...perhaps that is what your mechanic meant by "alternator issue". However, both should be checked out. Anyway, as has been suggested in one of the other posts, with the belt off, make sure all the other pulleys spin freely with no binding, make sure all the pulleys are in perfect alignment. With the new belt on, make sure the tensioner rides within the wear limits marked on the tensioner and make sure it is in perfect alignment with the other pulleys. In fact, if the vehicle is high mileage...replace the tensioner.
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Old 13 Jan 2013, 04:58 pm
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Default Re: DRIVE BELT KEEPS BREAKING - BECAUSE OF WHAT ?

Quote:
Originally Posted by Carl48 View Post
More likely the overrunning pulley than the alternator itself...perhaps that is what your mechanic meant by "alternator issue". However, both should be checked out. Anyway, as has been suggested in one of the other posts, with the belt off, make sure all the other pulleys spin freely with no binding, make sure all the pulleys are in perfect alignment. With the new belt on, make sure the tensioner rides within the wear limits marked on the tensioner and make sure it is in perfect alignment with the other pulleys. In fact, if the vehicle is high mileage...replace the tensioner.
also do this every time you change a belt usually :-)
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