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Re: 7080 AC

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Gordon Chance

03-28-1999 06:38:03

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Oly: It sounds like the pump timing may be off. When you installed the injection pump to the engine, what was the degrees before top dead center did you set the static timing? Check to see that the timing marks in the pump line up at 22 degrees BTDC. If you find that the timing marks line up at 22 degrees then you need to determine that the internal timing of the pump is correct. There are two ways that the pump station sets the marks to line up when they set the pump timing. They set them to line up at before injection or after injection. The pump needs to be set at before injection. I have had one injection pump that was set for after injection on a 7060 and it will run, but with low power and if run under a load will damage the engine. To confirm which way the pump is set do the following. Turn the engine until the marks lineup in the pump. Remove the cover over the pump drive gear and remove the pump drive gear. Use a 15/16" wrench and turn the pump shaft clockwise. Turn the shaft slow and you should be able to feel a hard spot when the pump begins to inject each cylinder. When the shaft comes around to inject the #1 cylinder, see if the marks line up when you feel it start to inject for #1 cylinder. If it does, then the internal timing is correct. If they line up after injection, then you have found your problem. If after making these checks you still haven't found a problem, then post back or E-mail me and I will try to give you some more things to check. Good luck and let us know what you find. Gordon

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