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Old 10-23-2001, 02:10 AM
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240 Motor mount breaking again and again

I am having a problem that I can't figure out. I hope someone knows what the problem is.

I have a 74 240D. About 6 months ago I was rear-ended (mild damage). About two days later the left motor mount broke. When the mount is broken, there is strong engine vibration.

I replaced the mount and everything seems fine.

The motor mount broke again in a few weeks driving. It has broken again and I have replaced it again two more times.

Does anyone have an idea what is causing this?

I tried loosening the fuel injector tube on each cylinder while it was running and found that each cylinder has the same effect.
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Old 10-23-2001, 05:57 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Sounds like the engine isn't aligned with the subframe properly, possibly when you were hit the driveshaft pushed the engine out of alignment. Take a look close at the trans mounting & the subframe.
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Old 10-23-2001, 08:29 PM
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Breaking Motor Mount

Thank You for your reply.

I am trying to think of a method to determine any misalignment of the frame/subframe or engine mounts.

When I replaced the left motor mount theier did not seem to be any misalignment in the screw holes. I took this as a sign that the frame was not misaligned. maybe there is something else I should consider.

I did not replace the right motor mount or transmission mount. Thety don't seem to be broken but maybe a little stretchy. If this could be a contributing factor I will replace them next time around.

I am wondering if there may be any contributing issues relating to fuel injectior or that the cam gear seems a bit louder than I would like (but I'm not experienced with diesel engines).

Thanks Again

Jon Schmidt
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