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This has reference to marine diesel jerk pumps.
To check the timing: The top cover of one pump is removed and the delivery valve assembly taken off. The engine is then turned in the direction wherein the plunger is moving in the direction of delivery and when the top edge of the plunger covers the spill port, the crank angle is read and referenced with the engine manufacturers value. A depth gauge is also placed on the barrel and the distance to the top of the plunger taken. This value is referenced against the manufacturers value and compared. This is the commencement of delivery, although injection does not start to occur it is only for checking the timing that it is termed as "commencement of delivery" in reality the fuel pressure starts to rise. Further turning of the engine in the same direction will then cause injection to take place and finally when the the plunger starts to move down and uncovers the spill port and relieves the pressure on top of the plunger. It is at this instance the crank angle is read off and the depth is also measured and compared with the manufacturers value. correction to this effect is done by inserting shims below the fuel pump body or below the fuel pump plunger.
This completes the timing. After this is the effective stroke of the pump can be carried out with the fuel rack position set at 80% and values compared with the manufacturers and finally when all parts for this pump is put together the other pumps are checked in the same manner. Once completed the engine is run and the performance of the engine is gauged.
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