May have found the source of the shake (123 300D) - PeachParts Mercedes-Benz Forum

DieselPaul · #1 10-27-2014, 02:34 PM

So my dads 85 300D has always shook, a lot. I posted about it a while ago, but lost interest in looking for it as other projects came up, and he drove the 240D daily this summer. As we are about to put the cars away for the winter in Ohio, we figured he ought to drive the 300D for a week or two get it some exercise before it gets put away again.

I had some new lemforder motor mounts, so I put those in. I have already checked for air leaks, replaced all the rubber hoses, diesel purged, replaced the filters, adjusted the valves, and installed the updated primer pump. I was out of ideas, and the mounts on the car were obviously collapsed.

Put in the new mounts, and it entered a whole new world of shaking, it's incredible how much it shakes.

So I started cracking injectors, 2-5 all make it even worse. With cylinder 1 cracked, the motor runs smoother, not firing cylinder 1. Tighten the line back up, goes back to shaking like all hell.

Moved injector 1 to cylinder 2, and 2 to 1. Same situation runs better with 2-5 hooked up and 1 unhooked. So that points to the IP.

I'd heard of stuck delivery valves, so I popped out the cylinder #1 DV and found...

That's all permatex that I dug out of the threads and out of the different pieces of the delivery valve. The bottom part of the DV was totally stuck in the chamber, used some smooth plastic tools to jiggle it out and dug out even more permatex.

The stupid things people do never ceases to amaze. Ordered new copper crush washers from the dealer today for $.85, hopefully this makes a dramatic improvement now that #1 DV isn't glued in place halfway up.