injection pump timing
 

1980 300SD

I've read through all the postings on ip timing and currently attempting to time mine. I adjusted all valves, no problem there, Installed new injectors, one or two were nailing and I had no idea how many miles they had on them.

The result was an inordinate amount of white smoke when cold and still some smoke when warmed up. The smoke had a strong diesel smell. So, I though ip timing might be off with new injectors. I also had increasingly hard starting.

I'm using the drip method and no matter where I move the ip it is a steady stream that pours out of the ip pump when pumping priming pump and then it stops. The flywheel is sitting on 25 degrees before TDC. I did look at the cam lobes through the oil filler and they are NOT facing straight up but about 25 degree before straight up.

Am I missing something here? Any ideas or suggestions would be appreciated. Like, why are the cam lobes not straight up when the marker is sitting on 25 degrees BTDC? Why is there no drip but a steady stream coming from the drip tube?

Thanks for any information, suggestions.

There is a lot of discussion on this topic. For the most part, the pressure you generate by pumping the primer pump isn't constant and the value is unknown. Mercedes never specified how much "pressure" there is supposed to be. Therefore, most people say rotate the IP until fuel comes out and then trickles down to nothing. That should be close enough.

Good luck,

Scott

If you cannot reduce to a drip then the pump might be so far out of time it will have to be pulled and moved to the next spline or so. Rotate engine bottom pulley until you just get a drip. This will indicate the correction direction to move the pump spline if required. A pump will not usually go this far out by itself.
It would be advisable to try to get an accurate chain stretch estimate before proceeding as well. Since the pump only rotates a given number of degrees in its slot that chain might be really stretched.