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Old 06-27-2002, 07:09 AM
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1989 300e question with belt replacement...

I just had my 300e head gasket replaced, and the head was sent to a machine shop to check for damge or cracks, the head came back fine..and the the motor is re-asembled, but my mechanic is having difficulty on remembering how the serpentine belt is put back... to make a long story short the belt was back on the car, but now my altenator isnt charging the battery, and the betl is looped on the altenator, my question is could the problem be, that teh serpentine belt isnt "snaked" through correctly causing the altenator to spin in reverse , hence not charging my battery... any suggestions, comments? thanks for your time....! : )
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Old 06-27-2002, 07:11 AM
Registered User
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Check your owner's manual. There is a diagram of the belt placement in there.
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
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Old 06-27-2002, 11:15 AM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785

it is obvious your mechanic is NOT a MB mechanic. I would check how loose the belt is. I bet the belt tensioner is not adjusted property or it is on its last leg.
'86 300E
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Old 06-27-2002, 01:45 PM
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See the following diagram where
1 is the tensionner
2) Crankshaft
3) A/C compressor
4) Fan
5) Alternator
6) Intermediate pully
7) Power steering pump
8) Water pump
hope it helps.
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1989 300e question with belt replacement...-belt.jpg  
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Old 06-27-2002, 02:02 PM
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Thanks for the replies.. ANd teh diagram looks very helpful, I ordered the MB-CDrom last week and got it in today! : ) Upon looking at it,,, I noticed that your belt diagram looked different than mines,,, not the actual pattern, but as if it was done by a different source. Is that diagram from a MB CDrom??
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Old 06-27-2002, 02:10 PM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
Jack's diagram looks like the one out of your owner's manual. If you have an AIR pump, then it is in place of the intermediate pulley (#6).

Did you check the diagram against your current belt setup?

Good luck!


'91 300E, 214K miles
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Old 06-27-2002, 02:32 PM
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The diagram is right out of my owner's manual.
Lukily, we don't have any air pump here in Canada. One less thing to worry about.
Since most our air comes from the south/west, what's the use of pumping already polluted air into the
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