Allis 6060 Injector pump issues

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   I have a 1984 Allis Chalmers 6060 433T  4 cylinder turbo engine having fuel injector pump issues, will start and run for about 1 to 2 minutes, the RPM's begin to drop, the tach will bounce up and down from 500 rpm to 1500 rpm but the engine sounds to stay the same @ about 900 RPM, with some to no throttle response and no power and then engine will start to drop off and shut down, wait about 30 seconds engine starts right up and does the same thing after about 1 to 2 minutes, I have drained the fuel tank replaced with new fuel, replaces fuel filter twice, bled system through the filter through the pump through the injectors several times and get the same results. The tractor has 4220 total hours on it It has a Stanadyne 4008997 2300rpm  DB2-3836  4976346 Injector pump. What could be the problem, is it a failing injector pump?

 How do I time the engine and pump before taking the pump off and reinstalling another pump? How do I time the new pump? Who rebuilds these pumps and where could I get a replacement pump if this is my problem?   HELP!

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RKBARRELHORSES Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 08 Oct 2017 Location: PRICE UTAH Points: 5	Post Options Post Reply Quote RKBARRELHORSES Report Post Thanks(0) Quote Reply Topic: Allis 6060 Injector pump issues Posted: 06 Sep 2024 at 12:17am
	I have a 1984 Allis Chalmers 6060 433T 4 cylinder turbo engine having fuel injector pump issues, will start and run for about 1 to 2 minutes, the RPM's begin to drop, the tach will bounce up and down from 500 rpm to 1500 rpm but the engine sounds to stay the same @ about 900 RPM, with some to no throttle response and no power and then engine will start to drop off and shut down, wait about 30 seconds engine starts right up and does the same thing after about 1 to 2 minutes, I have drained the fuel tank replaced with new fuel, replaces fuel filter twice, bled system through the filter through the pump through the injectors several times and get the same results. The tractor has 4220 total hours on it It has a Stanadyne 4008997 2300rpm DB2-3836 4976346 Injector pump. What could be the problem, is it a failing injector pump? How do I time the engine and pump before taking the pump off and reinstalling another pump? How do I time the new pump? Who rebuilds these pumps and where could I get a replacement pump if this is my problem? HELP!

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Mikez Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 16 Jan 2013 Location: Usa Points: 8394	Post Options Post Reply Quote Mikez Report Post Thanks(1) Quote Reply Posted: 06 Sep 2024 at 6:20am
	Try taking the return line check valve fitting out of top of pump and see if there’s a bunch of gunk in it. There’s a little glass ball in there. If there’s gunk blocking it and you’re able to clean it out. See if runs after that. If so your pump needs rebuild. The flex ring is coming apart inside and sending little pieces into fitting. Some say to nock that glass ball out to see if will run. But then you will need to replace fitting to. I’m not a pump expert but happened to us before and that’s what it was.

Lynn Marshall Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 13 Sep 2009 Location: Dana, Iowa Points: 2284	Post Options Post Reply Quote Lynn Marshall Report Post Thanks(1) Quote Reply Posted: 06 Sep 2024 at 6:45am
	If you suspect return line blockage on an engine with a Rossamaster injection pump, a very simple test is to just loosen the two small screws that hold the little rectangular cover on the side of the pump. That is the timing window to align the marks for pump removal. Let some fuel bleed out of there while it's running and see if it picks up. If it does,then your return fuel is restricted.

injpumpEd Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 13 Sep 2009 Location: Walnut IL Points: 4917	Post Options Post Reply Quote injpumpEd Report Post Thanks(1) Quote Reply Posted: 06 Sep 2024 at 7:13am
	Very common issue with the Roosa/Stanadyne DB or in this case DB2 pumps, broken down flex ring inside the pump, pieces plugging the return fitting on top, or if it's already been knocked out, somewhere between the pump return and tank is plugged. A good shop will offer the guidance for removal and reinstallation, when they do the rebuild job, I know I do. They get sent to me from all over, so I could do yours for you if you have no one close you can trust.
	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!