7.3 oil usage problem
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7.3 oil usage problem
Hi. I just picked up an early 99 F450 with 135,000 miles. In 170 miles it uses enough oil that it’s just barely on the tip of the dipstick. I replaced the fuel filter and it looks brand new and fuel in the bowl looks perfect after using this much oil. The turbo appears to be in excellent shape with no excessive play in the shaft. Do the injector orings ever go out without dumping oil into the filter bowl? Has anyone seen this much oil consumption through the ccv caused by a dirty air filter? The engine has essentially zero blow by. Thanks
Lead Driver
Joined: Oct 2005
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From: Ponca City, OK
I half wonder if the injector wouldn't be somewhat in better health w/ 235k or more. My personal opinion, #1 killer of engines is heat. #2 is long stretches sitting. Engines are designed and built to move, if they're not moving they're not lubricating, and everything in life is better with the proper amount of lubrication.
Banned
Joined: Dec 2018
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Injector o-rings would be a likely suspect. The clogged air filter causing excessive PCV vacuum is easy enough to troubleshoot, but that would have to be a pretty clogged air filter. A little bit of seepage past the turbocharger rings wouldn't likely account for that much oil loss without making itself obvious. I don't believe this will show up on any diagnostic programs.
Lead Driver
Joined: Oct 2005
Posts: 6,129
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From: Ponca City, OK
Pressurizing the hpo system w/ shop air should confirm or deny an injector o-ring leak, be it internal or otherwise. Do a search for the "Cody Test", should bring up the details for preforming the test.,
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Hotshot
Joined: Mar 2014
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From: Douglassville, PA
This is one method but something to consider....HPOP hits some 2800 PSI but you don't get that with air pressure. As a result, I believe that there could still be a bad O-ring even if it doesn't show up in the Cody test.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
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From: Ponca City, OK
Edit: I do remember a thread here where a member had to use a hydraulic hand pump to get a high pressure leak to show itself. So there's always that route I suppose.
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