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Old 09-25-2007, 01:33 AM
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Join Date: Aug 2007
Posts: 1
Strange Noise Started Tonight

I have a 1992 300E with the 2.6 motor. It's been running great since I got it, but then tonight as I got home it started acting up. As I'm driving through my apartment complex I hear a noise like a firecracker going off in the distance. Once I turned down my music and rolled down my windows I hear a sound like belts squealing. That went away after about 10 seconds and then it turned to a noise like putting cards in the spokes of a bicycle as I continued down the street. I parked it, turned it off, and restarted it, and the noise continued. It's not super loud, but gets a bit louder as the RPM's increase.

Any ideas? Thanks for the help.

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Old 09-25-2007, 03:32 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,114
I would check the idler pulley on the serpentine belt. (it has one, right?)

Tom W
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 09-25-2007, 10:01 AM
cmcdonnell's Avatar
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Join Date: Sep 2006
Location: Towson, MD
Posts: 184
A few weeks ago my distributor cover, the black plastic square shaped piece at the front of the engine, broke loose and was hitting the engine fan. I would check for anything hitting the fan, and also the auxilliary fan(s) up in front of the radiator.
1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out
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Old 09-25-2007, 10:06 AM
glenmore's Avatar
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Join Date: Sep 2002
Location: Los Angeles
Posts: 963
Sounds like something is wrong with your belt system. Either the tensioner or some pulley has failed and the fan belt is about to be shredded.

1991 300CE
2000 C280
1990 LS400
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Old 09-25-2007, 10:16 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
sounds like your serpentine belt shredded.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 09-25-2007, 06:30 PM
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Join Date: Aug 2007
Posts: 10
Agree with the others, and if you have a hydraulic damper strut attached to your belt tensioner I'd check the connecting bolts are OK.

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