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1994 E320, 1992 500SEL, 1998 ML320
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17 Posts
Discussion Starter #1
As the title say's I need the belt size for the M104 (1994) with the air pump removed.

It picked the best time to die as I'm supposed to be leaving for Chattanooga Tomorrow to buy it a sibling (500SEL) so I really need a temp fix as I wait for the new pump to come in. Does anyone have the correct info? I've been looking for hours and can not find I sold answer. The poor thing sounds like it's going to rip my drive belt to hell any minute, lucky there are three part stores with in three miles. I hope I make it.

Thanks so much
 

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W124 Moderator
86 190E 2.3L 16V, 2 95 320TE's, 02 S500
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12,701 Posts
Van,

I lifted this tip from the search function hits. Might work for you. Good luck,

Jayare

I agree with first unplugging the pump to see if that takes care of it. The car won't pass emissions without it but if you want to delete it take a piece of string and wrap it around the pullies in the proper configuration and measure it. Give that measurement to the auto part store and they should be able to track down the right size belt.

As long as the pump hasn't seized, then unplugging it would be much easier.
 

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1993 300e 2.8 - M104 -SOLD, Current: W220 S320, 2000
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750 Posts
Autozone 93 size belt...I answered you on the other forum with more detail ...
 

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Registered
1994 E320, 1992 500SEL, 1998 ML320
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17 Posts
Discussion Starter #4
To close out this thread and help others in the future here's what I did.

Bought multiple belts with the intention to take back the ones I didn't use. Well, they were all extremely to short. :mad:

Faced with the possibility that I was going to have to put that damn pump back on so that I could drive to the parts store was not a very appealing option to me. So I reinstalled the original belt, minus the air pump and was surprised to see what a close fit it was. After a adjustment of the belt tensioner the original belt was nice and tight. :D

So there you have it guys, on a M104 you can remove the pump and use your stock belt.
 

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Registered
1994 E320, 1992 500SEL, 1998 ML320
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17 Posts
Discussion Starter #5
PS- It was not the pump itself but the bearing in the pulley.
 

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I have a 1993 190E 2.6 and the air pump was making a loud screeching noise for sometime now. 2 days ago when I started the car to go for an errand, it was smoking at the air pump as the bearing in it was bad . After removing the whole air pump, I ran a string around the alternator, A/C compressor etc and it measured 92.5 inches. Went to the local auto shop and fitted a 6 rib, 20 mm wide and 2340 mm long belt and Walla! It fitted like a glove. Drove the car for about 3 miles and had absolutely no problems. Hope this helps
 

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Premium Member
1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
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7,111 Posts
I have a 1993 190E 2.6 and the air pump was making a loud screeching noise for sometime now. 2 days ago when I started the car to go for an errand, it was smoking at the air pump as the bearing in it was bad . After removing the whole air pump, I ran a string around the alternator, A/C compressor etc and it measured 92.5 inches. Went to the local auto shop and fitted a 6 rib, 20 mm wide and 2340 mm long belt and Walla! It fitted like a glove. Drove the car for about 3 miles and had absolutely no problems. Hope this helps
10 year old thread.

that said, the FSM gives the belt sizes and routing for every combination of stuff on the M103 engine...

and for the M104...
 
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