Mysterious oil loss - Ford Powerstroke Diesel Forum
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Old 02-03-2014, 01:10 PM
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Mysterious oil loss

Hi all,

Trying to find the source of oil loss on the 2000 f350 I put injectors and glowplugs in a few weeks ago. It's blazing through oil, about 2 quarts every 100 miles. NO external leakage, tailpipe is clean, little if any smoke while driving. No oil in fuel filter bowl. I'm thinking that it's still probably a nicked injector o ring-2 quarts every 100 miles is slow enough that it probably would never make it back to the fuel bowl, as the injectors on that side would be using fuel faster than oil is getting forced into the fuel system. Any other ideas, and are there any reliable ways to figure out which side to pull the valvecover on? I have a temp gun, I was thinking I could aim it at the exhaust manifolds and go for the side with the coolest temperature.
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Old 02-03-2014, 01:32 PM
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Injector o rings im sure

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Old 02-03-2014, 01:33 PM
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I would pull them all and replace all the o.rings. you don't wanna have to pull it apart again.....

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Old 02-03-2014, 01:45 PM
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Yep, that's what I figured. The injectors I installed are remans from Pensacola Diesel. Is it likely I did something wrong, or the o rings were substandard, or is it simply luck sometimes when this happens? The reason I ask is that the injectors were supplied by the customer. I'm inclined to simply eat this one unless there's pretty clear evidence that the o rings were bad from the start.
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Old 02-03-2014, 02:00 PM
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Not Pensacola. Could be just a rolled external oring got nic'd. Thats what you should hope for. If not they may be crappy rebuilds. There is a reason they are cheap. Probably dont even bench flow test them before they ship them out.
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Old 02-04-2014, 01:47 PM
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Is it even possible for an injector to internally leak oil into the fuel system w/o an oring problem?
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Old 02-04-2014, 03:01 PM
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it could pass oil past the intensifier piston orings internally and consume oil but more than likely you have a bad center "pink" external oring
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Old 02-04-2014, 06:28 PM
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Ok, thanks. Maybe my temp gun on the exhaust manifolds would reveal a cylinder running noticeably cooler than the others to tell me which valve cover to pull? Filtered motor oil does not burn as well or cleanly as diesel fuel when injected through diesel injectors. I know that firsthand...
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