Greetings Oil Burners,

Reference made to a 1979 300D engine.
I've read the posts concerning this issue but perhaps there are experiences not yet told. I seem to have a slight back and forth shaking motion felt inside the car while my diesel is idling in neutral or drive or park. I changed the left engine bearing rubber, and the right seems fine, but still it has the shakes. Are the engine shocks that are located one on each side known to go bad, and if so, how can you tell? Sitting still, would the tranny rubber transmit a shaking feeling to the interior. Any help in fixing this problem would be greatly appreciated. This problem just seemed to develop, so it's not the usual clackity clack vibration I think I'm feeling, but shakes your hands and butt a bit while at idle. Any other problems that could possibly be the cause please advise.

Thanks,

Charles

Yes, engine shocks do go bad. Try a search and you'll find a lot of post about this, and good advice on how to change them out yourself.

You'll also find injector rack 'damper' adjustment in a search, which can also be, or add to, the problem.

Good Luck and BCingU, Jim

Greetings Bill,

Glad you responded, I consider your opinion to be fact in most cases. I replaced the drivers side mount a week ago because the old one was toast, only half the rubber there with air space on the fender side. The passenger side the mount seems solid and operating. I've kind of looked at the tranny mount but it didn't seem to be falling apart, rubber wise that is. How can you tell if the motor shocks have gone bad on you or not? Is there leaking or what that indicates this as the problem? I'd hate to change them out and find I wasted hard earned cash for nothing. I keep hearing about rack dampner adjustment, but on my M/W injection pump, there is no nut or anything on the rear of the pump besides the vacuum shut-off valve. Where's the rack dampner adjustment on this IP? Bill, if you have any ideas to check out, let me know, I'm inclined to cure this small irritant.

Thanks,

Charles

I still haven't been able to cure the shakes my 1982 300SD has. I've installed all new engine/transmission mounts, got a new rack dampener screw, and re-timed the injection pump all to no avail. The car shakes side to side when the car is stopped. It feels like I'm sitting on top of an unbalanced washing machine. I would give anything to fix this problem. The car drives beautifully, though, at speed.

Greetings All,

I still keep hearing about a rack dampner screw adjustment to end my slight engine shake, but where the heck is it? There is no bolt sticking out of the back of my IP and my IP is a M/W series with no vacuum valve on the back top side. help me please to locate this adjusting screw. I have the diesel manual and there is no mention of any such screw or adjustment.

Charles

can-do,

I'm not positive, but I believe that the rack dampener is on the turbo models.

Have a great day,

Greetings All,

For awhile there I thought I was going nuts looking for an adjusting screw that didn't exist. Couldn't believe that I had a Mercedes service manual on my series engine and after some three thousand pages it seems and no screw to be found. The slight vibration I feel could easily be the engine shock absorber, but just looking at it I guess a person can't tell if they're good or bad. Any idea as to what the innards of these shocks use for a cushioning agent. Is it just another spring inside, rubber or fluid filled?

Charles

Thinking of all of the mounts that I have seen, they have all been rubber through and through.
Regarding your rocking...some people have gotten good, albeit temporary results, by using some Disel Fuel Catalyst (RedLine product) and then driving the hell out of it on the freeway...to "dust things off a bit". Its worth a shot.
-Larry

__________________
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09 Jetta TDI
1985 300D

Greetings All,

I still have that slight annoying engine vibration at idle, neutral and more pronounced in drive with my foot on the brake. As mentioned I had changed the drivers side motor mount and the right seems to be fine. Does the engine shock do any vibration absorbsion during idling periods, or is it's main job to keep the engine from jumping out from under the hood when you shut it down? I kind of hear a clunk when I shut the engine down, like it has bottomed something out and made a semi metal to metal contact. Is this a result of a worn engine shock? Is there anyway to check a shock to see if it's doing it's job? I looked at both sides, and of course physically it looks fine but I am able to move the top cup covering the rubber in circles with a little force. Should the upper metal cup be taunt and not be able to move? Any input would be helpful to rid me of these small vibes.

Charles