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Old 09-19-2002, 10:50 PM
Registered User
Join Date: Jul 2002
Location: Arizona
Posts: 12
300e engine noise

I have fighting with this off and on for two months now. When the car is in gear with the brake on there is a slight tick sometimes almost goes away. when out of gear and the rpms go up it gets a little louder. If I rev it to 2 or 3 thousand rpm it is very loud almost sound like my neighbors ram deisel.
I have replaced the lifters and changed cam too. I have tried to narrowed it down with a stethascope, but can't find it.

Sometimes when I rev it up, it almost sounds like something it rattling or banging around. Any input on this would be helpful.

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Old 09-19-2002, 11:00 PM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
Your belt tensioner pulley damper (small shock absorber right next to oil dipstick) could be making the noise you hear. Check both the upper and lower bushings for wear

Good luck
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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Old 09-20-2002, 02:05 AM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
I am with Paul on that one!

'86 300E
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Old 09-20-2002, 08:33 AM
drbrandini's Avatar
Join Date: Sep 2001
Location: Wrightsville Beach NC
Posts: 1,512
I am with these guys on this one

Mine is starting to rattle a little, as a matter of fact I was about to go down to the garage and fix it!

2008 S550
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Old 09-20-2002, 11:12 AM
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Join Date: Jul 2002
Location: Arizona
Posts: 12
Thanks guys,
How do I test it? Is it easy to see if it's bad? Do you know the what the cost of a new tensioner is?

Thanks again,
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Old 09-20-2002, 11:24 AM
Registered User
Join Date: Jul 2000
Posts: 23
Yeah thats what it sounds like I had mine rereplaced on my 190e and 300ce this year the independents charge me about 500 bills for each car I think the parts them selves are around 300 dollars if you replace everything,
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Old 09-20-2002, 11:43 AM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
before anything else, switch to a lighter oil.
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Old 09-21-2002, 07:49 AM
renok7's Avatar
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Join Date: Nov 2001
Location: Montréal
Posts: 95
Yup... sounds like the top bushing of your belt tensioner damper is getting sloppy.

Here's a 25 cents fix. Insert an o-ring between the top bushing and the washer. This will pick up the slack in the bushing and stop the rattle. I did this 10k miles ago and it is still effective.

'93 300E 4Matic
'98 Nissan Altima
'00 Yamaha Road Star Silverado
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