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Old 06-25-2009, 11:10 PM
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Join Date: Feb 2003
Location: Oklahoma
Posts: 1,021
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...

RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE
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Old 06-25-2009, 11:27 PM
79Mercy's Avatar
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Join Date: Mar 2008
Location: Florida
Posts: 4,128
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.
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

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles
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Old 06-26-2009, 06:05 PM
carnut's Avatar
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Join Date: Jul 2006
Location: Stockton California
Posts: 637
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.
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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