AC 5050 CAV injection pump timing

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   Trying to time a CAV injection pump on a 5050.(not trying to time the gears) I have a service manual and it shows to line up the letter 'A' with the edge of the snap ring when looking through to inspection cover on the pump.However the big snap ring appears to be installed in a rotated position so I can't line anything up. The pump has a 'sold and serviced' tag on it so it must have be repaired or replaced at one time. I don't know the history on that.
My question is, can I rotate the flywheel by hand until the injection timing mark lines up with the pointer and see when the injector sprays fuel? Or do you need more RPM to make that work.
I suspect the pump may have issues, but would like to have it timed correctly first. It does run, but seems to be putting out to much fuel.

Thanks,
Steve

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bozrae Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 02 Jul 2012 Location: Michigan Points: 165	Post Options Post Reply Quote bozrae Report Post Thanks(0) Quote Reply Topic: AC 5050 CAV injection pump timing Posted: 21 Nov 2017 at 7:42am
	Trying to time a CAV injection pump on a 5050.(not trying to time the gears) I have a service manual and it shows to line up the letter 'A' with the edge of the snap ring when looking through to inspection cover on the pump. However the big snap ring appears to be installed in a rotated position so I can't line anything up. The pump has a 'sold and serviced' tag on it so it must have be repaired or replaced at one time. I don't know the history on that. My question is, can I rotate the flywheel by hand until the injection timing mark lines up with the pointer and see when the injector sprays fuel? Or do you need more RPM to make that work. I suspect the pump may have issues, but would like to have it timed correctly first. It does run, but seems to be putting out to much fuel. Thanks, Steve
	D15D, D17G, 170G, 175D, and two 5050FWA

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injpumpEd Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 13 Sep 2009 Location: Walnut IL Points: 5080	Post Options Post Reply Quote injpumpEd Report Post Thanks(0) Quote Reply Posted: 21 Nov 2017 at 8:27am
	Those pumps normally just get timed to the engine by the mark on the flange. Beyond that, you're usually just grasping at straws, and like you suspect, something else is wrong.
	210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!