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Old 12-17-2001, 12:59 PM
Registered User
Join Date: Feb 2000
Location: Springfield, MO
Posts: 270
Question VERY Annoying Engine Chirp

On my E320, there is a Very annoying engine chirp coming from the main belt. I couldn't figure out what it was at first, but I stuck my head closer and closer (but not too close ) to the sound until I isolated it. I sprayed a little lube on it (the belt) to see if that stopped the chirp and it did... for a minute of so. How can I get rid of this sound? It is VERY loud all around the car and makes it sound like a POS! Any help is appreciated. Thx
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Old 12-17-2001, 01:27 PM
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Join Date: Jun 2001
Location: California
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It's time for a new belt. Yours is not maintaining its grip on the pulleys.

04 ML500
02 E430

Experience is something you don't get until just after you need it.
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Old 12-17-2001, 04:52 PM
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Location: Springfield, MO
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Is this something I can do myself, or should I seek professional help? I know that some of these belts that have to go around 7 or 8 pulleys cans be very tricky...
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Old 12-17-2001, 05:13 PM
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Join Date: Jun 2001
Location: California
Posts: 326
I would start by purchasing a manual for the car. After reviewing the step by step instructions, you'll have to determine whether you have the tools and mechanical skills needed to complete the job. Pop the hood and take a look around. It is not a tough job, but make sure you do your research and feel confident before you even start.

Play around with the search function at the top of the screen as well, and you should find some tips from those who have documented the job in detail.

04 ML500
02 E430

Experience is something you don't get until just after you need it.
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Old 12-17-2001, 05:50 PM
G-Benz's Avatar
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
I was in the process of replacing the alternator on my 93 300E and decided that it would be a good time to replace the belt while in there.

Could not figure out how to slaken the belt tensioner, so (belts do stretch), I tugged at the belt, and there was enough play to pull it over one pulley, and thus, take the rest of the belt right off.

I agree. You need the manual in order to follow the sequence of threading the new belt back on. My Haynes manual showed four configurations, based on which 6-cyl engine I had, and where the accessory components (in different locations for each engine) shared the belt.

The threading sequence took about ten minutes as I carefully made sure I rounded each pulley correctly. One neat thing is that each pulley gives you a clue of whether or not you are on the right track, since the smooth pulleys indicate that the smooth side should be facing the pulley, while the grooved pulleys indicate just the opposite.

I threaded mine from the bottom and worked my way up, so that I could just tug the remainder of the belt over the last pulley...and I'm not a he-man either!

That was four months ago, and no problems with the belt!

BTW, this is a LOT easier with the fan blade and shroud removed!
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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Old 12-17-2001, 11:16 PM
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
I just had my belt changed.... though it looked just fine? I have 110,000 miles on my motor.

What is the regular service interval for a belt?

The belt diagram for my C280 is in my regular Owner's Manual!
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 12-18-2001, 05:41 AM
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Hi i just wanted to add my 2 cents too...ive got a 1997 C200 Elegance which has 52,000kms which is i dunno in miles...recently it makes chirping and screeching sounds when i just accelerate the car normally. It sometimes makes that sound too when its idle...I hope i dont have to get something replaced....i dont have the finances at the moment just after i bought some schmick 17"inch wheels for the car....hmm is this maybe the same problem as the E320? how old is ur car?


1989 300TE
1997 C200 Elegance
2000 ML430
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Old 12-18-2001, 10:27 PM
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Join Date: Sep 2001
Location: Lathrup Village, Michigan
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You may have pullys that are not aligned correctly.

The MB manual only show different wear indicators to determine if the belt needs changing. There is no interval for changing the belt, just an inspection every 12,000 miles.
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

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Old 12-19-2001, 01:45 PM
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well my friend make sure that the tensioner has not gone bad as well and you wind up doing the job twice so whatever you were spraying the lube at hopefully it wasnt at the tensioner because then you need to replace that also.
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Old 12-19-2001, 06:00 PM
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Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Re: VERY Annoying Engine Chirp

Originally posted by ss109
... I sprayed a little lube on it (the belt)...
Ix-nay on the Ube-lay. Just replace the belt. My dealer charges next to nothing for labour on this job, far below the "book" as their special tools allow them to get the job done very quickly. Look into it if you're not able to do it yourself...
John Shellenberg
1998 C230 "Black Betty" 240K
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Old 12-21-2001, 09:30 AM
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Driver, Mercedes-Benz
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
It is fine to spray lube at the belt?
... Kerry

126 tailed by a 203, 129 leading the pack.
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