Case 970 putting fuel in the oil......

tool · Oct 24, 2008

Hi all, this looks like a great discussion board, I've been a reader but never a poster.

Anyway, I have an early 970 Case that I bought in an estate 1.5 years ago.

I had problems with the old fuel in it, I religiously drained the water trap on the tank and changed the filters several times yet I think I have managed to dammage some fuel system components.

I have a slight miss and it's putting fuel in the oil.

Anybody able to point me in the direction to start looking?

I'm guess the best bet is to start at injectors and work backwards?

old · Oct 24, 2008

Could be a bad injector, or return line or seals in the injector pump or if it has a fuel pump a fuel pump going bad. But do not run it much if any till you fix it or if you get to much fuel in the oil it can/will lock up and that can then cost big $$ to fix BTDT sort of. I didn't lock one up but I got one that was locked up and had to fix it
Hobby farm

varmint · Oct 25, 2008

i have seen the return line plugged off with ded bugs that got in the tank when it was getting filled. that will blow the seal on the pump evry time.

tool · Oct 27, 2008

Yep I stopped running it as soon as I discovered that it was making oil.

Drained and replaced the oil allready, my plan now is to start it, run it and check with my laser thermometer for a cold cylinder on the exhauset manifold and, if there is one pull that injector first, bench test the injector and compression test the cylinder while the injector is out and work backwards from there.

Unless anybody has a better idea?

Brian Jasper co. Ia · Oct 27, 2008

You can find the misfire simply by loosening the line to each cylinder. Just keep your fingers away from the squirting fuel. If you have water in your fuel barrell, you probably have microbes growing in it. Get your fuel tested. BG Products can do it. I'm sure there are others that can to.
It won't do much good to have your pump rebuilt only to leave the cause of the trouble in your tank.

tool · Oct 27, 2008

Yes I hear you on the fuel quality issue, that has to be addressed before replacing any other fuel system components.

After draining the water trap MANY times and replacing both filters several times I don't seem to get any more water or dirt from either.

I'm tempted to remove the tank, drain it and have it steamed but everybody tells me that there is a high probabillity of dammaging the threads in the bottom of the plastic tank?

(according to the guys at the Case IH dealer where I buy parts)

I wish I knew how to identify if it is in fact the lift pump, or injector pump that was the cause of the problem.

Would removing and inspecting the lift pump tell me anything?

Case 970 putting fuel in the oil......

tool

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old

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varmint

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tool

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Brian Jasper co. Ia

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tool

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