Question about 2001 BMW 330

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Bmw 330d serpentine belt fitting

My friends bmw 330d water pump broke and the serpentine belt fell off. i have put on a new pump bet for the life of me can i work out the route the serpentine belt goes over the seven pulleys. ive been searching for a diagram with no luck can anyone help. thanks andy

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  • David Daley Feb 09, 2009

    I have a similar problem with my 2001 330i. The idler pulley locked up and destroyed the serpentine belt. I replaced the idler and bought a new belt (6PK1538, effective length of 60.5") and installed it the way the belt manufacturer recommended it should go on. The previous problem mentioned seven (7) pulleys. I only have six (6): crankshaft, fan, alternator, power steering, idler and tensioner. A/C has a separate belt. When I installed the belt it wasn't tight enough and the idler is in close contact to the tensioner. I'm either not routing it properly or the spec for a 60.5 effective length belt is too long (incorrect).

    Like most cars the belt routing diagram can be found on the fan shroud. Not on my car.

    Can someone provide a sketch or diagram of the proper routing and is the 60.5" belt the right length for the six pulley system?

    Much Thanks,




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Hey Andy a quick was to solve your problem is to locate a similar vehicle in a car yard, go have a look at the configuration and draw your self a quick diagram whilst your there.

Posted on Oct 04, 2008


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