Quote:
Originally Posted by stephenc1984
[IMG]  [/IMG]1981 240D has an idle shake or rattle that I am at a loss to figure out. It is only at idle. Anything above idle it goes a way. I changed the engine mount last year thinking that was the issue to no avail. I replaced the idle shock as well as the rubber bushing that mounts behind the oil pan to the chassis cross member, still there. I just noticed that the engine mounts are totally compressed to the point that the metal on the engine mount is touching the frame. I checked the part number 123 241 1213 to see if I got the wrong part and it is the correct part number. I jacked up the engine an inch and can visible see that the engine mount is no longer bottomed out on the frame. The idle rattle is gone. I’m thinking one or two possibilities. 1) a bad batch of rubber from the factory or 2) Trans mount is wrong for the car or installed incorrectly.
Please point me in the right direction. Thanks |
Unfortunately there is many directions to go.
What companies Motor Mounts did you use?
The Motor Mounts on my I replaced on my 84 300D were URO which is not a good quality company but the lasted I believe it was 5 years before they collapsed.
People have been using 2 of the same Lemforder (the mounts are made by Phoenix which is the same as the genuine Mercedes mounts. Country of origin is Turkey) mounts for my 300D on the 240Ds of your year instead of the 2 different mounts that only companies like Meyle and so on still make.
Concerning the cause of the shaking at idle it can be caused by one or more the following, uneven compression, unbalanced Injector pop/opening pressure, Injector pop/opening pressure too low, worn our Injector Nozzles, valves not seating or burned, the need for a valve adjustment, idle speed set too low, the overflow/pressure relief valve needs the spring stretched to a free length of 27mm or replaced and that is all I can think of right off.
If your Fuel Supply Lift Pump valves are worn or you are sucking in air.
Some have claimed changing the Delivery valves in the Fuel Injection Pump cured the rough Idle when the other stuff mentioned was not the issue.