Hey all,

I just bought a 1973 220D with either 91k or 191k miles. he car runs but was smoking black at idle as well as while driving. It's not terribly bad but I would like to try and fix the problem if possible.

I checked the easy things first; throttle linkage, vacuum pump for oil, re-lashed valves, checked gov on IP for leakage by applying vacuum and it held.

I decided to check the IP timing as to maybe this was causing my smoking problem.

The problem is, I can't time it. I followed the instructions for drip timing located here PeachPartsWiki: How to Set IP Timing via the Drip Tube Method

I fashioned a drip tube out of a spare set of lines I found in the trunk.

I removed the pump element of #1 cyl. Removed spring and delivery valve and re-installed the element then connected the drip tube.

Turned the engine by by the damper to 24 degrees BTDC.

When I pump the IP, I get no fluid out of the drip tube. In fact, regardless of where the crank is, I never get fluid out of the drip tube.

If I loosen the pump element a tad, and pump the IP again, I will get a steady stream of fluid. Even with the slightest amount of torque on the pump element, it will not squirt.

The other pump elements do the same thing.


My question is; is it possible that I have the wrong pump elements for this bosch pump?

I also noticed there is no crush washer installed, there was only a O-ring on the pump element for sealing. Could the lack of a crush washer cause this to happen?

Thanks for your help, I refuse to let this thing beat me!