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Old 01-09-2019, 12:04 AM
Join Date: Nov 2014
Location: SF Bay Area
Posts: 832
oldskewel is on a distinguished road
Originally Posted by johngrefe View Post
Best I could tell there is some light chipping on the front face of the water pump pulley. The belts are coming apart from the front, my guess is this is the culprit.
And does that correspond with the missing rib on the old belt that works? And if you are brave enough to flip that belt (so ribs 123456 are now running in grooves 654321) does bad stuff happen?

BTW, I always heard that you should never change the direction of a belt after installing it (and like many things automotive, this advice was given with no explanation). Did not make sense to me until I figured it would be this groove potential issue where after a while the belt's ribs either survive or not (or wear to accommodate) in the grooves it's got and makes it work. But if flipping, all bets are off. Anyone know if that's right or other factors are involved in that never-flip directions advice?
2001 X5 3.0i, 180k miles, AT, owned since 11/2014
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Old 01-09-2019, 08:06 PM
andrewwynn's Avatar
Join Date: Jun 2015
Location: Racine, WI
Posts: 4,099
andrewwynn is on a distinguished road
You can file off the rough edge of the wp pulley and flip the belt. If the problem doesn't come back you found the problem and can replace the belt.
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
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Old 01-09-2019, 09:56 PM
Join Date: May 2018
Location: NYC
Posts: 930
mr_robot is on a distinguished road
You can also try those laser pulley alignment tool. It magnetically attaches to the pullies and points a laser to check if the grooves align.

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2005 Imola 4.8iS
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Old 01-10-2019, 12:23 AM
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Join Date: Jun 2015
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andrewwynn is on a distinguished road
If there is no alignment option not sure if that helps just confirms you are screwed :-)

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E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
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Old 01-10-2019, 11:46 AM
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Join Date: Apr 2011
Location: Pleasant Hill, CA
Posts: 420
jcp240z is on a distinguished road
On my M62 I ate two belts. Turned out the indie who replaced my water pump (I was far from home and needed it done) did somethings screwy. Never figured our exactly what, but the pulley was slightly out of alignment causing the belts to go pretty quickly. It was hard to tell just by visual. You needed a straight edge to see the misalignment.
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