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Old 07-21-1999, 02:56 AM
bdrought's Avatar
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Join Date: Apr 1999
Location: Milton Keynes, UK
Posts: 403
You people have saved me a load of money, and I'm hoping you can again. I have a 91 300CE. It runs great, but when started from cold it rumbles like a bad diesel. This rumble only seems to happen when its in D or R with my foot on the brake. If I put the gearbox to P or N, it doesnt happen, or if I apply some throttle, it doesnt either. Also, when I brake hard, the gear selector seems to rock backward about 1/2 inch. Is this normal? Is this most likely an engine problem, or a tranny problem? Or just a simple mounting? Any help would be appreciated.

Brian Drought
1991 300CE
Old 07-21-1999, 12:57 PM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
I will say you need new motor mounts & check
the transmission mount too.
check transmission rod bushings.

MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner
Old 07-21-1999, 09:01 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
The engine mounts are faulty when the base is less than or euqal to 13mm from the frame.


Old 07-22-1999, 03:35 AM
bdrought's Avatar
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Join Date: Apr 1999
Location: Milton Keynes, UK
Posts: 403
Thanks for both your answers... I will go check the mounts later. At the moment its not too bad since it goes away after 5 mins of running... I assume the mounts are just transmitting startup vibration... possibly goes to show the engine is running smooth one warm I guess. ;-)

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