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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

International 500C Help

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Cory

02-28-2004 12:55:40




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I have a 73 IH 500C dozer with 3cyl diesel. The engine will fun fine for about 30 minutes then dies down to an idle no matter where you have the accellorator level. I do not think that it is heat related because I have to wait over a week or two for it to run for another 30 minute. When I let it cool and try it the next day, it will only idle. I've replace fuel filter, water seperator filter, and air filter and did bleed them. It started doing this before the filters were change, but it had been over a year after the filters were last changed and everything worked fine up until now. Someone told me to check the fuel bowl, but I could find no such thing. I did drain all the fuel and put fresh in. Any ideas would be much appreciated. Thank you, Cory

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mike

02-28-2004 20:23:10




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 Re: International 500C Help in reply to Cory, 02-28-2004 12:55:40  
we had a 656 ih had a blocked return line to the fuel tank the tractor ran for a while then had nothing over a idle. also check the breather on the fuel tank, to see if it is letting air into the tank.



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ihmike(n.e.tx.)

02-28-2004 20:06:34




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 Re: International 500C Help in reply to Cory, 02-28-2004 12:55:40  
cory, Well unless you just get lucky and find the problem your going to have to troubleshoot step by step to narrow the problem. Sounds like a fuel restriction or a air leak into the suction side of the fuel system problem to me. Or a combination of both. Or fuel inj. pump or its transfer pump. Since those are expensive, need to eliminate those first by checking everything up to the pump. You will have to build your own stuff to do it. Unless you have several hundered extra laying around to by a kit.The object is going to be to find out how much vacume is at the inlet to the inj. pump and how much air is getting to the pump. You will have to rig some clear plastic (vinyl) line and a vacume guage into the line right before the inj. pump. Then since I don't think the 500 has a power-shift trans you will have to operate the machine from the operators seat to load the engine fully. 100% throttle !! This means you will have to have a few feet of clear line to enable you to check for air bubbles while under 100% throttle, a few are normal, a bunch are not. Vacume should not be more than about 4-6 inches. If all this checks ok, then the problem is in the inj. pump or its transfer pump. Read manuel to check pressure on the transfer pump. But if you do not check the input side first, then you will be buying a transfer pump for nothing. PS. Just remember to plumb all this in to the main fuel inlet line just before it enters the inj. pump. That way you'll know everything is ok up untill that point. Also like those other guys said, could be a simple little screen up there clogged up, so don't over look that. hope this helps. Mike.

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JOE

02-28-2004 17:04:57




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 Re: International 500C Help in reply to Cory, 02-28-2004 12:55:40  
IF IT A 3 CYL. DET. CHECK THE FUEL LIFT PUMP,NOT INJECTOR PUMP ALSO CK. FOR AIR LEAK IN LINE



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jim/pa

02-28-2004 18:45:47




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 Re: Re: International 500C Help in reply to JOE, 02-28-2004 17:04:57  
im not familiar with your machine but, on my case diesel, theres a screen just inside the injector pump where the inlet line goes in. i dont know how, but coarse material from the system gets thru the filters, and clogs that screen. the result is the same problem as you describe. good luck, jim



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