Cat Diesel Engine Dies

C. Amick

Well-known Member
I have a friend that has a Cat Dozer (see photo) and he can"t get to run. He says that it runs well then sputters and quits. He as ordered new filters, but the ones in there aren"t that old. He initially used it for about an hour digging and it ran well. He as removed the filers, drained the container the filters are in, opened the main fuel line and let it run slowly for while to hopefully drain any water out of the tank, filled the filter container half full of diesel, replaced the filters, bled the lines, restarted it and ran well for a short time and then died again. Any thoughts/recommendations?
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Either he is getting air in the system from a gasket leaking where he changed the filters. Or he has not got all the air out. Fill the tank completely full and open the bleeders on the filters. Then once fuel is clear and flowing there open the bleeders in behind each injector turn engine over with little starting engine till fuel is coming out of the bleeders on the injectors as you close them you should have it start running.
 
Nice ole 8U or 9U, 6A blade, hardnose with hydraulics, track pads a tad bit worn, LOL, but good on turf !

While not all that familiar with the fuel system, something comes to mind about using a section of an old tire tube, the valve stem area, cut it large enough to fit over the filler neck of the tank, and use compressed air to pressurize, just slightly, a pound or 2, correct me if I wrong, but wouldn't that help push the air out from the tank to the filters, and to the injection pump and system where you could bleed it ???
 
Start by taking off fuel line at tank, open valve right up and look for good flow. Put line back on then take off at other end and check flow. Just keep checking flow untill you get it clear.
Later Bob
 
Just a little pressure, a couple of PSI, you can band that section of tube around the filler neck, hard to say whats on the bottom of the tank, might want to let some of that flush first, filters should catch the rest if its like my old D7, not the same but similar. Bob may have forgot more than I'll know about many of these tractors, but knowing a little about the fuel system in general, of this era, it should not take too long with a little common sense to see if you can purge the air, and this is an old trick that may work in other instances, other tractors where you just need a little nudge ! Let us know how it goes, always something to learn!!!
 

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