Bleedin' a 504 Diesel

Anonymous-0 · Mar 10, 2009

Chisel plowin' a few acres ,knew fuel was gettin low, headed for the shop, crossed a shallow ditch' plow got high centered, wheels throwed a few chunks of mud, sunk down on the back end and ran out of fuel....Four hrs jackin,1 out of 4 jacks had enough jack oil to jack "THE WIFE" pulled Me out with the Mahatma, I mean the Mahindra.....Re fueled, Bled lines, 504 wouldn't start. "THE WIFE" pulled Me to the hard road, short piece, tractor started, Runnin' Rough.
Question is...I Tried bleedin' at the injectors 5 times , still had bubbles...I have had to bleed a few CAT D 6....D8 so on, over the years could always get fuel without air bubbles. I killed engine started at the filter bled to the fuel pump, started the engine ,opened the nut at the injectors, still got bubbles, openin' the nut does pull the engine down like pullin' a plug wire off a gas burner....What do I do now??? Thank Y'all

504-2 · Mar 10, 2009

I would get it running set the throttle wide open and go eat supper, when you come back it will be fine. If it dies pull it again and see above.

Hugh MacKay · Mar 11, 2009

Bill: those early D-188 and D-282 could be a pig to get all the air out. I have a tendancy to say the same as 504-2, however if you have it running cracked each injector, one at a time for 2-3 minutes each and still getting air bubbles, I have to think you have an air suction leak somewhere between fuel tank and injection pump. These can be damn hard to find. I've seen cracked lines, cracked filter canisters, sediment bowl leak, etc.

I'd try letting it run for an hour or so at brisk idle, probably 1,200-1,500 rpm. If that doesn't cure it, turn fuel off at sediment bowl, take fuel line off at pump and apply about 20 psi back pressure through filters, lines and sediment bowl. I've seen air suck in, where fuel will not leak by graviety from tank. I've seen these older diesels run forever and a day, you know all is not perfect, and bingo that running out of fuel, brings out the worst.

I wouldn't rule out pump either, sometimes running out of fuel puts an end to a well worn old pump. I would do the other two ideas first.

Anonymous-0 · Mar 11, 2009

There is also a plug on the side of thoes injector pumps that has to be bleed if the fuel has been all run out the system. I think? it uses a 1/2 wrench. Been there on the D282 motor

Bleedin' a 504 Diesel

Anonymous-0

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504-2

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Hugh MacKay

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Anonymous-0

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