Re: 656D Running Rough

Posted by Owen Aaland on March 14, 2007 at 20:44:55 from (65.165.246.14):

In Reply to: Re: 656D Running Rough posted by South Texas on March 14, 2007 at 19:19:03:

Whenever the engine is running there need to be fuel flowing from the return line. If you have the line off the pump and almost no flow when running, try taking the fitting off the top of the pump where the return line screws in to. If fuel now flows beter check the fitting for pieces of the old ring. There is a restrictor wire or plastic check ball in this fitting so it can be hard to clean. A lot of times I just replace this fitting.

There is a charge pump on the end of the pump where the fuel inlet is. The pressure developed by that pump is responsible for filling the charge pistons in the high pressure chambers and is also used for timing advance. A restricted return will cause loss of fuel delivery because the high pressure pistons will not fill properly and will also cause the pump to not advance with higher RPMs. You pump mechanic probably has a timing window he can put on the pump to check for sure the advance is working.

I have changed many of these flexible rings and it is a relatively simple procedure, but you must have a good working pump to start with. If there are any other problems with the pump it is best to have a pump shop do the work. I have rebuilt them in the shop but you have to have a good working tractor engine, dynomometer, flow meter, and timing window to do it properly. If you are lucky you can do a good job in only about twice as much time as shop with a pump stand.

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