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Old 11-03-2003, 08:01 AM
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Join Date: Apr 2001
Location: fort worth
Posts: 363
when to replace 300E engine mounts?

My 87 300E has 320K miles. A recent MB club mag (Star) told how to change the engine mounts in its driveway mechanic article. I have not changed engine or trans mounts for 7 years or 135K miles. How do I tell if they are bad? Should I change them anyway? There is a tech session next Sat.
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Old 11-03-2003, 08:29 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The lower portion of the motor mount is BELL shaped. You should replace the mount when there is less than 13 mm clearance between that portion of the mount & the crossmember the the mount sits on.
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Old 11-03-2003, 10:14 AM
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Join Date: Feb 2000
Location: Canada
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My 300E has 280,000 Km on it and I've having the mounts done soon - they need to be replaced as diagnosed by my tech. I had complained to him that my idle seemed rougher than usual with slight tremors through the chassis. Turned out the mounts are toast. Not an expensive job.
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
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1989 300E - 333,000 Km - sold
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Old 11-03-2003, 10:43 AM
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Join Date: May 2001
Posts: 161
MB Doc what about a W140 S car

Are the motor mount measurements similiar for 95 S420 car?

Thanks for any info you are sure of.

Luck to you, DanielW
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