injection pump timing D282

dan osborne · Apr 10, 2013

I have a 656 diesel that I have determined needs an injection pump rebuild. I have fuel to the pump, injector nuts are loose, but no fuel to injectors when cranking engine. On the crank pulley, there are degree markings starting with the letter A and maybe going 40 degrees to a small 1/8" pin, and then going about another 10 degrees to a letter R. I am assuming the pin is "0" degrees? I have cleaned the pulley, but all I can make out is the "0" every 10 degrees because the first digits are on the edge of the pulley and cannot be made out. I am trying to figure out where to get the timing before I remove the pump. I am thinking once I get the crank where it is suppose to be, something will line up in the window of the injection pump. Am I correct in this. Any advice would be greatly appreciated!

pete 23 · Apr 10, 2013

It should be timed 1 degree before top dead center. The little ball on pulley is tdc. If marks were visible they would be one degree to each mark. With side timing cover off pump, turn engine to near tdc and once in every two revolutions the mark on rotating governor retainer will come around so align it with the stationery mark on cam. If pump is twisted off the governor retainer will not turn BUT you have to observe closely as it may be difficult to see that it is actually turning.

rustred · Apr 10, 2013

well if your are in the timing marks area of pulley on compression stroke then just line up the timing marks in pump window and it will tell you what it is currently set on. It is 3 degree's btdc, is the setting on them.
but it is not nesessary to align marks before pump removal, but it is nice to know what the current setting is.
then when installing pump set your timing marks on 3 degree's btdc on compression and have the timing marks aligned on pump and install it. be careful of shaft seals not to fold them over. once installed just align pump marks by using the bolt slots and tighten it down.
ooh and the a is advance and r is retard. and marks are every 10 degree's.

rustred · Apr 10, 2013

I went by timing of 3 degree's for 606 , so your 1 degree may be correct pete. as the earlier 282's had 3 degree's except 660 was at 5 degree's.

pete 23 · Apr 10, 2013

Heck, I was going to say, your 3 degrees was probably right. I remembered they changed their minds and moved the timing up later on. Fact is, the very first 656 gear drive tractors had a speed advance and they soon changed to the load advance system that had been in use on the 560's. I would have to look at the book to be sure though. The hydrostatic models stuck with the speed advance as they were higher rpm engines. I like to run them as late as you can and still run smooth at high rpm's with a properly adjusted automatic advance be it speed or load style. .

injection pump timing D282

dan osborne

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pete 23

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rustred

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rustred

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pete 23

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