Question about 2001 BMW 330

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Serpentine belt routing

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,
Dave

Posted by on

  • David Daley Feb 10, 2009

    Attention ewashmidas:



    The occasional dyslexia set in after tiring hour to repair the "B". I was routing to the tensioner off the power steering pump. The correct routing was a more difficult route but it worked very well. It might also have to do with the quart of blood I left all over the alternator and surrounding parts. Outstanding, thanks for the help.



    Best Regards,

    Dave

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Here you go.. I looked up the same belt you did, it should be right.

Serpentine belt routing - adecd3f.png

Posted on Feb 09, 2009

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snorkelbobby_12.gif
Item Part Number Description 1 10346 Generator pulley 2 8678 Belt idler pulley 3 3A733 Power steering pump pulley 4 8620 Drive belt 5 2E884 A/C clutch pulley 6 6B209 Drive belt tensioner pulley 7 6312 Crankshaft pulley 8 8509 Water pump pulley


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snorkelbobby_13.gif
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snorkelbobby_14.gif
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Don't have a chart, video, or diagram available at the moment. Can offer you generic advice.

1.Somewhere in the middle of that serpentine belt, that is wrapped around all those pulleys, is an Idler tensioner Pulley. All this pulley does, is put tension on that serpentine belt. Usually located somewhere in the middle.

The Idler tensioner Pulley will be on a bracket. It will be on the end of the bracket. The bracket usually has a 1/2 inch square hole in it. This is used for a tool, that resembles a 1/2 inch breaker bar.
-> I, use a 1/2 inch breaker bar.
The 1/2 inch breaker bar is inserted into this square hole, and the bracket is pulled to one side.
This pulls the tensioner pulley away from the serpentine belt, allowing the belt to have slack, and then the belt is slipped off of one of those pulleys. Release the pressure slowly, remove the tool. Then the serpentine belt is removed all the way.

(The Idler tensioner pulley bracket, can only be moved in one direction, to take pressure off of the serpentine belt. The direction opposite, of it putting pressure on the serpentine belt.

The spring used to put pressure is Very strong. This is also an area, where you can easily slip, cutting your knuckles, or fingers, or hand, on sharp objects. Use caution, you may want to wear a glove, or gloves!)

Then the new serpentine belt is wound around the pulleys in the correct pattern, the Idler Tensioner Pulley is once again pulled to the side, and the last of the serpentine belt is slid into place. Then you slowly release the tensioner pulley, and it puts pressure on the serpentine belt once more.

Make sure the serpentine belt is in the grooves of the pulleys, and is wound around in the correct pattern.

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1996 Grand AM 3.1L serpentine belt replacement


Try this procedure.
0900823d8004ed44.jpg


To replace a worn belt, locate the idler or generator pulley.

0900823d8004ed45.jpg


Loosen the hold-down fastener for the idler or generator pulley.

0900823d8004ed46.jpg


Pry the idler or generator pulley inward to release the belt tension and remove the belt.

0900823d8004ed47.jpg


Match the old belt up for size with the new replacement belt.

0900823d8004ed48.jpg


Observe the belt routing diagram in the engine compartment.

0900823d8004ed49.jpg


Install the new belt over each of the drive pulleys. Often the manufacturer recommends a sequence for feeding the belt around the pulleys.

0900823d8004ed4a.jpg

Art courtesy of Delmar - Thomson Learning.
Pry out the idler or generator pulley to put tension on the belt.
Pry out the idler or generator pulley to put tension on the belt.

0900823d8004ed74.jpg


Install the belt squarely in the grooves of each pulley.

0900823d8004ed75.jpg


Before adjusting belt tension, check for proper pulley alignment. This is especially critical with serpentine belts. Measure the belt deflection in its longest span. If a belt tension gauge is available, use it and compare the tension to specifications.
If a belt is too tight, wear to bearings for the water pump, alternator, and engine crankshaft can result.
Some late-model Chrysler engines require a torque reading to be taken when tension is applied to the generator drive belt. This is especially important on the longer, multiribbed V-belts.

0900823d8004ed76.jpg


Pry the idler or generator pulley to adjust the belt to specifications.

0900823d8004ed77.jpg


Tighten the idler or generator pulley fastener.

0900823d8004ed78.jpg


Start the engine and check the belt for proper operation.

Any more questions please ask. Good luck.

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Not quite sure how many idlers it should have, but does your car have A/C? Serpentine belts for any car that have the A/C option are sold in two different lengths, the A/C one being longer. If this is not the case, ask your NAPA parts person for the routing diagram for your vehicle. Having worked for them in the past, I know for a fact they have easy access to them. Sometimes with serpentine belts, even experienced mechanics get confused and can`t reroute it right without a diagram.

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