Quote:
Originally Posted by Maxbumpo
How many times did this car start up and run perfectly before you adjusted the valves?
How much experience do you have adjusting valves?
I keep coming back to the sequence of events where all the trouble started after you adjusted the valves.
Injection pump and the two 13mm nuts on the delivery valve plunger assembly: These affect the quantity of the fuel that the injection pump sends to that injector. If these have been moved, the pump is out of calibration, unless they were moved by a Bosch-trained technician on a test bench.
If you can discern the original position, try moving it back, as you've got nothing to lose at this point.
You could also perform a rough calibration using a set of graduated cylinders (lab equipment - think test tubes marked up for liquid volume measurement) that catch all the fuel from each delivery valve / injection line as you crank the engine over. Compare the volume of diesel from each position, adjust #2 to match the others.
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I have adjusted valves quite a few times before in other cars. this was my first time doing an om617 but I had no issues. everything went exactly as I expected and I feel confident I set the gaps well. Interesting on the injection pump, I might have to try marking where it currently is and trying to move it back to where it looked like it was originally calibrated to be.
I started and drove the car maybe 3 times before doing all the maintenance, and I know that I test started it after completing the valve job and it started and idled fine. I believe it was the next drive (over an hour on the highway both ways) that I arrived home and it was running on 4 cylinders at idle. I'm beginning to think it was coincidental that the valve job preceded the issue... I think when I have a chance I will try my luck with the injection pump's 13mm nuts i'm not supposed to touch. If nothing else maybe I can see if it greatly effects it and decide to purchase a used pump or send mine out for re-calibration. If it doesn't do anything probably bring it in to a shop to perform a leak down test and maybe give some insight from experience I don't have with diesels. If i'm going to go all in and pull the head I at least want 100% confirmation that is the issue...
Also, any idea on cost of getting a pump re-calibrated?
Thanks.