IH 239 injector Help

Need to change-check the injectors in my 3500a loader. I dont think they have ever been out. It is a 1973 IH 239. Has anyone taken one of these out? I know it won't just pull out. I have a slide hammer and pullers but don't want to break it. I have never changed one. Just had injection pump rebuilt. Should I replace all 4? I know #1 is shot, all white smoke. Thanks Dale

Good chance the trouble is not the injector, white smoke means fuel is getting into the chamber but there's not enough compression heat to burn it. Did you try loosening each injector inlet line nut, taking fuel away while running to see if the smoke clears? Does the blowby tube have "puffs" of air coming out while running? That's a sign there's piston/sleeve/ring trouble. Can be confirmed with a compression check after the injectors are out. My Hydro 84 has the late Bosch bar stock injectors with the single clamp bolt holding them in place. Early engines used the two bolt style Bosch injector. On either type drain the coolant first before pulling them as the brass sleeve they are in MAY come out too. I've had to split the brass sleeve to get out the corroded injector from the sleeve..

Puller, pry bar, big hammer?

Not a lot of blow by. Cracked exhaust manifold on #1. A lot of raw fuel running out the crack. Cleans up a little when it warms up. Just pry them out?

Most will pull if not corroded in the brass tube with two roll head pry bars. Raw fuel out the exhaust could be an injector that's stuck open, but that usually will cause a loud knock. Try to find which cylinder while running and loosening each line, the one the white smoke clears when loose is the problem cylinder. Low compression will cause the raw exhaust fuel too.

Dale, our 826 has essentially the same engine as your tractor, only it has 6 cylinders instead of 4. I don't know which injectors yours has, but when I put new injectors in it a couple years ago, they were surprisingly cheapest for NEW ones, and that was from the Case IH dealer. So close in price, that it wasn't worth getting ours rebuilt. I don't know if that is still the case, but that's how it was a couple years back. Mine had the 2 bolt style injectors. I just blew off the head with a compressor, washed everything off with brake clean, blew it off again, cracked the injector lines so they were loose, loosened up the nuts until they were almost all the way off, and just stuck a short pry bar under each of the ears where the stud goes through. I just gently pried, didn't have to force any of them, they came right loose. Then I rinsed it off with brake clean again and blew it off again, after which I finished removing both nuts, and unscrewed the injector line all the way, and then removed the injector. Also, I believe that the Nuess IH engines are more prone to wet stacking if not working, fully warmed up, under full load, etc. Make sure the thermostat is working, and covering the radiator in winter will help some with the wet stacking. Not that that is your issue, just something to keep in mind.

Ross

Thanks for the help guys. This engine has been abused. Bought the unit as a non- runner. Had a plastic in line filter on it. Some one had the injection pump apart and didn't get it back together right. Looks like a lot of dirt went through the system. Thinking now that it has a new pump. Now it needs injectors. And Ross you are right just as cheep at case

Those injectors have replaceable nozzle tips, lots of injectors I repair are much less than complete assemblies if the bodies are good and just the tips are replaced. On some Cummins applications the complete injectors are the same cost as the tips. Don't always make sense, used to ask why at the Bosch service training classes, never got a good answer. Always wondered if some companies use a dartboard to determine pricing. Just replaced some Perkins injector tips, think they were 45.00 each if I recall.

I had to make a pry bar out of a piece of 5/8" rebar. Heat the end and pound it flat and put a bend in it. Then grind the end to fit the injector. Only takes a few minutes to make.