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John Deere Tractors Discussion Forum
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730 diesel injection pumps timing questions

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4010 puller

10-30-2006 12:34:30




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Hey folks:

I had the fuel injection pumps rebuilt on my 730 diesel and got them back in but believe it is out of time. I need the procedure for setting the timing of the injection pumps.

After removing the pumps and re-installing the pumps, should I have to re-time them?

Is #1 cylinder the flywheel side, while #2 cylinder is the clutch side?

When checking pump timing, with the mark lined up on the flywheel and case, which stroke should the engine be on before any adjustments are made to the pump?

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mjbrown

10-30-2006 14:38:34




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 Re: 730 diesel injection pumps timing questions in reply to 4010 puller, 10-30-2006 12:34:30  
If you didn't have the flywheel off and mess with the cam shaft or the gears running it it should not need to be timed assuming it was right to begin with. Hopefully you sent the pumps to the shop attached to the bracket and got them back that way. If so they should be synchronized with each other. That leaves installing them and the push rods which will have to be adjusted to the correct length as FIT explained. Do it slowly so the scribe line on the plunger does not go beyond the front of the little window or you can ruin the pump.

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F-I-T

10-30-2006 14:09:44




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 Re: 730 diesel injection pumps timing questions in reply to 4010 puller, 10-30-2006 12:34:30  
>>After removing the pumps and re-installing the pumps, should I have to re-time them?

Since they were rebuilt, yes, you will have to do this at a minimum. To have them run in near synchronized output, they should have been set up in synch while mounted to the pump bracket. If they were not, you may not know the relative fuel delivery position of one pump versus the other on the common rack. I'll assume they are in synchronization, but if not stop right now and have them checked.

>>Is #1 cylinder the flywheel side, while #2 cylinder is the clutch side?

Yes.

>>When checking pump timing, with the mark lined up on the flywheel and case, which stroke should the engine be on before any adjustments are made to the pump?

The engine would be on the compression stroke. Be certain that you have located the #1 INJ mark, and not the #1 TDC. Same goes for #2, 180* later. Adjust the pump scribe line to line up with the metal tang that it on the outside of the pump body. Adjust the plunger push rod to gain alignment. After you set this for each pump, spin it over twice and come up on the marks again, to assure that they repeat.

Frank

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CFWelles

11-04-2006 03:45:18




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 Re: 730 diesel injection pumps timing questions in reply to F-I-T, 10-30-2006 14:09:44  
What does a shop do to put these in synch when in the brackets? I would expect that equalization of volume output is the goal, but how do they do this? Shims involved? Have only gone through the timing procuedure you outlined on my 730. May eventually want the injectors redone and that is why I ask about the synchronization in the brackets.



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