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  #1  
Old 06-25-2009, 11:10 PM
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Location: Oklahoma
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Is 13mm too wide for the A/C belt???

Haven't been around here much lately - my time has been spent on other Mercedes purchases. Up to 4 now - and my wife is still talking to me!

Anyway, I have had repeated problems with the AC belt on my '78 300D. Today, it frayed around the edges and it came off. I put a new one on and it just looks too wide to me - it is a Conti belt, 13mm wide, and it seems to set up too high in the pulley groove. It is really hard to get it tight, I think I did but I'm not sure it's not going to start slipping again. When it starts to slip, the compressor starts screeching something awful, primarily while idling.

I thought I read somewhere that the AC belt was 12.5?? I can't find one anywhere...

ryan
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  #2  
Old 06-25-2009, 11:27 PM
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Location: Florida
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13mm is fine. That old york compressor really puts a beating on the belt. I have found that if you keep it on the tigher side than it will not fray as fast.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

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1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

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  #3  
Old 06-26-2009, 06:05 PM
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The rule of thumb is the belt must lay fully in the pulley. The top of the belt should be flush with the pulley. Wrong angle cut on the belt or too wide will not grip as well and will wear prematurely.
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