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Farmall & IHC Tractors Discussion Forum
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450 Diesel Problems.....Please Help

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wdrew24

02-10-2006 16:16:30




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I got the thing to start on gas. (Thanks to all who helped on that) I'll explain what was the problem there later. What the problem now is this: I followed the book exactly and got all the air purged out and was happy to see the pressure gauge was just about pegged to the right. The only problem was when I opened the bleeders on the injectors I got no fuel, no air, no nothin. I pulled the plunger out of the pump and the spool valve in the bottom was stuck in the compressed position. I dis-assembled the plunger and the valve had crud on it. I cleaned it and re-assembled it. Here is the problem...After I put it back together and re-bled the system, I started her on gas, and opened the bleeders on the injectors. Fuel and air, I was so excited. Then the over-flow tube on the pump started pushing Fuel out the bottom...Meaning that something was leaking fuel into the injector pump crank case. I took the lid off the pump and put all the rest back together and re-started the engine. The fuel is leaking out of the housing on the plunger where the high pressure tube bolts in. It is not leaking at the tube, but from the "window" (if you will) that is on the side of the plunger housing. I looked at the diagram again and I don't understand what ever kept the fuel from squeezing out there. Does anyone know what is going on here....I'm sorry this turned into a book.

As for the gas problem that is now fixed. Who ever it was that said to check the "Flippers" in the intake was right. Even though they where shutting ok....there was a small opening where crud had built up and would not let them close all the way. Once I cleared the crud out (meaning they would close all the way) then the engine would only draw air through the carb thus pulling fuel with it. THANKS TO ALL THAT HELPED WITH THAT PROBLEM !!!

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Janicholson

02-11-2006 10:07:02




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 Re: 450 Diesel Problems.....Please Help in reply to wdrew24, 02-10-2006 16:16:30  
I think I was the one that hinted at the flippers (butterflys) in the intake.
From my recollection of that pump (mine was gummed up stuck) the window is the bleed off to control amount injected. I thought the cavity was scavenged? I may be wrong as that was 8 years ago and it is still working as far as I know. JimN



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the tractor vet

02-11-2006 07:17:02




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 Re: 450 Diesel Problems.....Please Help in reply to wdrew24, 02-10-2006 16:16:30  
Well ya got a seal that is not sealing somewhere . And it is like this I don"t even screw with injection pumps as i do not have all that it takes to work on them they are not carbarators and setting and testing has to be done on a test stand as just one littel wrong twist of a screw could cost and engine and i like to see waht it is doing on the stand before i put it on the engine then i have a base line to work from as far as turning it up . If ya screw up the govener and put it on the tractor and start the tractor and it goes wide open ya may not be able to shut it down sorta like the old Detroits when and injector stuck and held the rack open if ya could not force it to the shutdown then the best thing to do was RUN as fast and far as ya could , on a stand if it stuck all had to do was turn off the switch and it was back to square one . SO the best thing to do is take the pump off and find and OLD TIMER THAT KNOWES THE OLD PUMPS and have them go thru it and replace the cam bushings and replace all the seals and set it to spec. + 10% and life will be good.

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