Sounds like your timing is off. What exactly was changed in your pump when it was worked on? Without knowing, you have no easy way to tell where your timing is being set.
Timing a diesel is complicated if something gets changed incorrectly. One of the timing marks that you line up inside the injection pump timing window are put on by hand by the repair person. The installer is supposed to put the marks on in the correct place after laying it on a degree wheel, but who knows? I've had to fix a few with . . . marks put in the wrong place - and some with no marks at all. When in doubt, sometimes air-timing is the only remedy.
Generally, it works like this. Injection timing when expressed in degrees differs depending on where the "injecting" is happening. Injection at the pump, at a mid point at an injection line, injection as fuel leaves the injector, or at time of combustion. From the pump to beyond the injector nozzle, there can be 4-6 degrees difference (injection lag). They ALL happen at different times. No problem with a gas engine since spark travels at the speed of light. With a diesel, pressurized liquid has to travel out of the pump, along a line, and through an injector nozzle. Then a little later, combustion takes place.
Maybe your pump is fine; I can't tell from here. But - it might behoove you to air-time and see verify the timing marks are correct.
Procedure for air-timing when pump timing marks are "questionable" or missing.
A. Connect air pressure (30 to 100 PSI) to fuel discharge port #1. You might have to fabricate something to do this. I use the banjo-end from an old injector line hooked to an air-chuck.
B. Viewing the timing line on the pump-cam through the timing window, rotate the pump in normal direction of rotation (with pressurized air line hooked up).
C. When resistance is felt, the cam rollers inside the pump are just contacting the cam (getting ready to inject).
D. At this point, the two timing lines in the pump window should be in line. If not, one is incorrect.
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