diesel in the radiator

[james dilley]

Went to get the Water pipev fixed And while draining the water There was Diesel fuel in the radiator, The owner says theres NO way. I talked to A Detroit Certified Tech. And he says the Injector cups are leaking. I know what I saw.

[OkieDavid]

I know the six cyl Cummins with their "pressure timed fuel delivery" system could leak around the injector and cause that (been there and done that several times) and although rare (since as I recall, Detroit uses a dedicated feed and communal return line to each injector), I suppose an injector cup seal could result in return pressure fuel entering the coolant at the head. As long as you aren't getting coolant in the oil (head gasket), the injector seal is the only place I can see fuel and coolant mixing. Since the return fuel is still under greater pressure than the coolant, path will be fuel to coolant and not coolant to fuel (resulting in the tale/tale white exhaust plume). Fuel in the oil could be damaged pump shaft seal. What are the specs on your engine and I'll dig out the old manuals? My only experience with Detroit(s) is the old Silver 71 series and their woefully inadequate initial attempts at converting gasoline 350 V-8 engines.....

[zant]

Head will have to come off to check cups,these should always be replaced when head is off,cheap insurance...Let us know what problem was..I have a S60 Detroit in my 770...Good Luck

[james dilley]

Well while checking the coolant level last nite I was treated to A HOT Diesel fuel shower. from the Radiator, The pressure was quite high, even while running. There have A mechanic check the engine tommorow .