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if you know where the timing marks are supposed to be the use the old method of cam/crank timing to check and adjust to where the marks will be. Remove no 1 injector and turn the engine over until no 1 piston is coming up on injection stop when you reach TDC. mark on flywheel of harmonic balancer. If there is valve clearance ot both rockers turn the engine another 180 degrees and bring the piston to TDC again. watch the rockers and if you turn back a few degrees or turn forward a few degrees you will see ( in the forward direction) the exhaust valve closing and at the same time the inlet valve will be opening. This is known as valve rock. As you move the piston bacvk and forward over TDC you will see the valve movement. set on TDC and check the timing marks with the positions indicated. Remove and reposition the cam shaft gear to achieve the correct mark alignment or pull the cam shaft out just enough to realign the teeth to the mark. At the most you will be about 1 tooth out. The pump timing will be out 180 degrees as you are setting the valve timing on the induction stroke and you will need to turn the engine 180 degrees to compression stroke for the pump timing marks to line up. the injection mark on the flywheel is what you are looking for and when it is at the correct number of degrees as indicated by injection / lightning flash sign then the marks for the pump should be just about lined up
Most engines are required to be a TDC or Top Dead Center and then align the timing mark on the injector pump with the housing or mounting surface mark. I would obtain a specific manual for your engine...just to make sure. Best Wishes.
I have been doing research on the Delphi pump and it apparently is associated with lucas/cav and as such is timed by the use of a dial test indicator that, through the use of a plunger and cam, runs on the cam block in the pump and determines when injection begins. Initial timing is to set the flywheel on the injection timing mark and the pump flange mark set on the timing case mark. To get it exact I would recommend that you have a diesel pump shop do the timing using the correct tools. As the pump is not electronic as such (from my research into Delphi ) it is basically a manual injector with a electronic controlled governor. Any way the best advice is to have a pump expert set the timing.
These things are easy to time. Just line up the scribe mark on the pump to the scribe mark on the timing cover and that's it. The pump only bolts to to the drive gear one way because of a dowel. One tip if your not already aware, leave the injector lines attached to the pump for removal and install, it will make life easier.