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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Someting does not make sense

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jdemaris

11-23-2005 18:55:50




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I'd like to hear more details. I've got an open mind, but again I've never experienced the problem or any major difference between the IT and Deere manual. Taking this down to the fundementals - you've got a four cylinder engine that fires 1-3-4-2 and when setting up the initial timing, you've got #1 cylinder on TDC of compression stroke. This part is self-evident and no book needed unless there's a question as to which cylinder is #1. I know both books agree. Now, take the Roosamaster injection pump. When the timing lines are lined up - it is in fire (injection) position for #1 cylinder - period - there is no way around that - unless someone put the wrong weight-retaining ring into the pump (which in turn would have one timing mark in the wrong place). Now - at this point it is possible that someone is mis-identifying which discharge hole in the injection pump is for #1 cylinder. You can't change the firing order of the pump, but it IS possible to hook up #1 injection line to the wrong discharge hole (just like putting the wrong plug wire on a spark plug on a gas engine). Is this where you say you saw a difference between the books? When you say it shows a 90 degree difference - I'm asking in what? If, as you say, you installed the injection pump with the timing lines aligned, and #1 piston was at TDC of the compression stroke, and the engine is out of time - than either the injection pump has the wrong timing lines inside of it, or the injection line for #1 cylinder is hooked to the wrong discharge port of the pump. Please explain or tell me what I'm missing here.

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HTR

11-23-2005 22:05:51




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 Re: Someting does not make sense in reply to jdemaris, 11-23-2005 18:55:50  
Me dog is not in this race, but the on the late serial no. 2010, the fuel lines were rearranged. The no.1 fuel line was moved one hole to the left, viewed from the top of the pump. If he was installing a late pump on a early tractor, he would be 90 degrees early using the original lines. If installing a early pump on a late tractor, he would be 90 degrees late. The cam ring and Governor disk were marked accordingly, for the port, in the rotor, to be in register with the correct fuel line. I don't recall the pump numbers.

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jdemaris

11-24-2005 08:02:40




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 Now, that does make sense in reply to HTR, 11-23-2005 22:05:51  
That makes sense - but it has never been an issue for me. I don't install ANY injection pump on ANY engine without first ascertaining which port is the one that fires when the timing lines are lined up. It is very easy to check. If the pump is off the tractor - put it in a vise, use a hand-pump oil can to squirt diesel fuel into the inlet, and stick a big screwdriver into the drive end of the pump. Turn it an observe which port fuel squirts out of when the lines are aligned. If the pump is already mounted on the engine, then it is even easier to check. Simply crank the engine and observe. So, from my point of view, I don't see why any of this is problem.

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