901 Injector Pump Leak

901Diesels · Jun 22, 2018

My apologies if this has been covered before - I'm new to the forum and new to diesel tractors. I recently bought a 901 Select o speed diesel. the tractor hold 30 to 40 psi oil pressure - doesn't smoke on start up, but am having trouble with throttle response. seems the governor is not working properly. After looking at the manual I decided to take a look at the pump timing. When I removed the inspection cover diesel runs out.
Shut off the fuel tank and thought I would let it empty out - went to pick up hay and upon return still leaking. Guessing my fuel shut off is not working either. Guessing the pump seals are shot and it is leaking internally. Lots of places on line sell seal kits - Is this something an average mechanic should attempt? - should I just have the pump rebuilt? or am I overlooking something?
Thanks

wayde · Jun 22, 2018

The gov. ring has gone bad in pump.Yes you can rebuild it,be real careful or it will not work.

901Diesels · Jun 22, 2018

(quoted from post at 17:30:13 06/22/18) The gov. ring has gone bad in pump.Yes you can rebuild it,be real careful or it will not work.

My manual doesn't cover it but I found several videos on line. At least I was on the right track. Would this put diesel into the crankcase oil as well? I checked it tonight and way over full - Thanks for the info.

Larry NCKS · Jun 23, 2018

Injection pump drive shaft seals are leading causes of fuel leakage into the crankcase on these. So are injectors and fuel return lines.

It could be running fuel back through the return system rather than a bad shutoff valve. If the return line standpipe in the tank is broken or gone, fuel has no restriction on coming back into the pump through the return. This is not an uncommon problem on these tractors.

Be careful. If you decide to tackle the pump yourself. These are very delicate operations and aren't for the average person to attempt.

Larry NCKS · Jun 23, 2018

Injection pump drive shaft seals are leading causes of fuel leakage into the crankcase on these. So are injectors and fuel return lines.

It could be running fuel back through the return system rather than a bad shutoff valve. If the return line standpipe in the tank is broken or gone, fuel has no restriction on coming back into the pump through the return. This is not an uncommon problem on these tractors.

Be careful. If you decide to tackle the pump yourself. These are very delicate operations and aren't for the average person to attempt.

TinCan · Jun 23, 2018

Here is a picture of the bottom of the injector pump. You see the shaft that Larry is talking about that the seals leak. Next is a picture of the shaft out. You just need to grab it with a pliers, and twist it and pull. It may hold tight, but you just need to really pull. It will come out. Nothing holds it in but the rubber O-ring.

If you decide rebuild it yourself, it's not that hard to do. I have two different articles that I use to help disassemble it, and reassemble it. They are both for a horizontal mounted pump, with electric shut off, but other wise their the same pump. In fact, that's all I found online was horizontal pumps.

The hardest thing I had trouble with was getting out the cam screw (ball shaped bolt), It is very tight. I was told but someone that rebuilds that he puts a punch into it, and hits it with a hammer a couple of times, then it will unscrew. I put a short pipe onto the hex wrench, and gave it hell, and it finally
it came loose. When you remove the two large hex bolts on each side of the housing, mark witch side they came out of. Makes it easier then looking up as to where they go.

Also mark, or write down which way the advance ring (there's a arrow on it) , and the transfer pump liner (you should see "CC" on it) are sitting, before you remove them. If you forget, you can find easily which way is right.

I never pulled one apart before doing mine. It was a lot easier then I thought it would be. I have pulled mine apart more times then I can remember, trying to figure out what is wrong with mine. I was just told but a mechanic, that works on these Ford tractor diesels, my problem is not in my pump, it's in the engine.

I say, go for it, reseal it completely yourself.

Pat

901Diesels · Jun 24, 2018

Thanks for the advice and pictures. Ordered parts today - will update the progress.T

(quoted from post at 05:47:24 06/23/18)
Here is a picture of the bottom of the injector pump. You see the shaft that Larry is talking about that the seals leak. Next is a picture of the shaft out. You just need to grab it with a pliers, and twist it and pull. It may hold tight, but you just need to really pull. It will come out. Nothing holds it in but the rubber O-ring.

If you decide rebuild it yourself, it's not that hard to do. I have two different articles that I use to help disassemble it, and reassemble it. They are both for a horizontal mounted pump, with electric shut off, but other wise their the same pump. In fact, that's all I found online was horizontal pumps.

The hardest thing I had trouble with was getting out the cam screw (ball shaped bolt), It is very tight. I was told but someone that rebuilds that he puts a punch into it, and hits it with a hammer a couple of times, then it will unscrew. I put a short pipe onto the hex wrench, and gave it hell, and it finally
it came loose. When you remove the two large hex bolts on each side of the housing, mark witch side they came out of. Makes it easier then looking up as to where they go.

Also mark, or write down which way the advance ring (there's a arrow on it) , and the transfer pump liner (you should see "CC" on it) are sitting, before you remove them. If you forget, you can find easily which way is right.

I never pulled one apart before doing mine. It was a lot easier then I thought it would be. I have pulled mine apart more times then I can remember, trying to figure out what is wrong with mine. I was just told but a mechanic, that works on these Ford tractor diesels, my problem is not in my pump, it's in the engine.

I say, go for it, reseal it completely yourself.

Pat

901 Injector Pump Leak

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wayde

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Larry NCKS

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TinCan

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