Question about 2007 GMC Savanna

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97 Gmc Savana,6.5 turbo diesel vacuum pump not rotating

My 97 Gmc Savana,6.5 turbo diesel's vacuum pump is not rotating at all times when engine is running,causing my fan belt to squel like the hammers of hell.Is it supposed to rotate all the time?Or is it worn out with 227,000 miles on it?They run around 200 bucks for a reman one and I want to be sure Im right by replacing it beforehand.Can the get clogged up and be cleaned out at all?? Additional Details - The pump will stop rotating,usually at engine startup then rotate after a minute or so,and it cuase hard lag on my alternator while its not rotating.Sorry for the after the fact edit.

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I have the same van hit the pump with wd 40 chec to see if it is free .and change serpentine belt it is worn that is the main cause for the pump not t spin at least it worked for me same van with diesel belt is about 40 bucks

Posted on Mar 15, 2010

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If the pump is not rotating all the time then it's due for replacement. They are not supposed to stop while engine is running. 227K miles is a lot of miles for any engine component.

Posted on May 18, 2008

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Fig 1. Injection pump and camshaft alignment marks - Diesel engine.

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Fig 2. Removing the timing belt holder - Diesel engine.

archaeology_67.jpg

Fig 3. Injection pump alignment marks - Diesel engine.

archaeology_68.jpg

Fig 4. Tensioiner Pulley Bolt Sequence - Diesel engine.

archaeology_69.jpg

Procedure - Timing Belt replacement.

1. Disconnect the negative battery cable. Drain the cooling system.

CAUTION
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To install:

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