PeachParts Mercedes-Benz Forum - View Single Post - Frustration With Factory Service Manual On Installing OM621 200D Injection Pump

Squiggle Dog · #5 08-15-2010, 11:14 PM

I made sure the camshaft lobes were pointing up and the timing marks set to 47 BTDC. I then inserted the pump with the marks aligned.

The car started and ran but was smoking here and there. I played around with the positioning of the pump (bending the hard lines each time is a PAIN) but it didn't seem to change anything.

I loosened the line for the first cylinder at the pump to look for fuel bubbling out as I turned the engine but didn't see any. I then pulled out the first delivery valve and attached a drip tool. Fuel would pour out and then start to drip at a moderate rate at around 50 BTDC. At 26 BTDC the fuel would start to pour out again. I couldn't find a place where the drips stopped and got sick of messing with it.

I took the car for a test drive and it was somewhat lacking in power, smokey, and ran a bit hot. I don't think I feel like messing with it anymore. I am going to see how much the local independent Mercedes repair shop would charge to time the pump. I really hope they won't have to remove the pump (if it was off some teeth, for example) because that is really going to add to the bill and I think they would have a really hard time with the fuel hose and clamps.

I found out today that the fuel hose I installed a few months ago is melting at the ends by the hose clamps. That means that when I went to clamp down on the hose clamps that the hose would keep squishing out like clay and then the clamp would slide off. I had to replace much of it. It is supposed to be biodiesel-compatible hose. The lining seems to be compatible, but the outer hose is not!

Now I am REALLY not looking forward to fixing the engine oil leaks.