Oil disappearing
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Mountain Pass
Joined: Jan 2009
Posts: 185
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Oil disappearing
2000 F450 with a 7.3. The last week this truck has been using oil rapidly. Over the past 2 days I've had to add 5 quarts of oil. I don't see any crazy leaks, the engine valley is dry and the coolant is clean. Truck runs ok with no smoke. Driver said it was shaking a little bit. Any thoughts on where it is going?
Fleet Mechanic
Joined: Apr 2019
Posts: 1,736
Likes: 660
From: South AR
2000 F450 with a 7.3. The last week this truck has been using oil rapidly. Over the past 2 days I've had to add 5 quarts of oil. I don't see any crazy leaks, the engine valley is dry and the coolant is clean. Truck runs ok with no smoke. Driver said it was shaking a little bit. Any thoughts on where it is going?
how is your air filter? If dirty can create a vacuum sucking oil out of engine..
checked your fuel filter recently? If black likely have injector o rings that need attention.
Cargo Master
Joined: Sep 2015
Posts: 2,860
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When mine started using alot of oil it ended up being the injector o rings . There is a injector O-rings test you can do by applying 100 psi air pressure to the heads where the hpop lines hook up to the heads. If it leaks down quickly the oring(s) are at fault. Another guy on here recently disconnected the hpop lines from hpop, filled the lines with oil and see if the oil goes down the lines over a period if time. I have not tried this method but sounds pretty simple
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,352
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From: Lake Hartwell, GA
Have a look over this thread to see if it is something you can accomplish.
https://www.ford-trucks.com/forums/1...diy-style.html
This link may help you. The author has not returned to provide additional information.
https://www.ford-trucks.com/forums/1...l#post19389441
The 7.3L PSD Tech Folder can be a great resource for you as well.
https://www.ford-trucks.com/forums/1...-7-3l-psd.html
https://www.ford-trucks.com/forums/1...diy-style.html
This link may help you. The author has not returned to provide additional information.
https://www.ford-trucks.com/forums/1...l#post19389441
The 7.3L PSD Tech Folder can be a great resource for you as well.
https://www.ford-trucks.com/forums/1...-7-3l-psd.html
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
That's a lot of oil and they don't smoke because they burn oil. They burn oil so well that they can run on it and they could even runaway on it if they get too much of it, which they could do if it's a turbo seal leak. I don't know if they can, or cannot run away on an O-ring leak.
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Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Its not going to smoke, there is enough people that run waste oil with no smoke.
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oil in the fuel will add a little haze to the exhaust compared to straight #2 but probably nothing you'd notice during daylight hours. Maybe at night you'd notice it under certain lighting conditions. depends how high the concentration is also.
I thought it was debunked that bad injector o-rings could cause black fuel and filter in the fuel bowl with a stock dead-headed fuel system. It might just be a dirty filter? I'd drain the fuel bowl, put a new filter in and check it over the next couple of days to see if it is obviously getting black quickly.
As said already check the air filter too. If it has the stock crankcase ventilation setup it could be sucking oil out of there if the filter is creating too much of a vacuum restriction under boost.
I thought it was debunked that bad injector o-rings could cause black fuel and filter in the fuel bowl with a stock dead-headed fuel system. It might just be a dirty filter? I'd drain the fuel bowl, put a new filter in and check it over the next couple of days to see if it is obviously getting black quickly.
As said already check the air filter too. If it has the stock crankcase ventilation setup it could be sucking oil out of there if the filter is creating too much of a vacuum restriction under boost.
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Joined: May 2014
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From: Lake Hartwell, GA
I thought it was debunked that bad injector o-rings could cause black fuel and filter in the fuel bowl with a stock dead-headed fuel system. It might just be a dirty filter? I'd drain the fuel bowl, put a new filter in and check it over the next couple of days to see if it is obviously getting black quickly.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
The gist of it is that once the fuel is at the heads the chances of it going back to the fuel tank are non existent. It's not like excess fuel goes out the other end of the head and back to the fuel tank as it can in some engines. Therefore, oil from the injectors cannot end up in the fuel tank. I am not an engineer (IANAE) but the logic sounds logical.
Fleet Mechanic
Joined: Apr 2019
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From: South AR
@SkySkiJason was talking about this recently. I cannot remember the details, but he said that the fuel filter turning black was in no way in relation to the injector o-rings leaking. Or something along those lines.
Thread Starter
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Mountain Pass
Joined: Jan 2009
Posts: 185
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@SkySkiJason was talking about this recently. I cannot remember the details, but he said that the fuel filter turning black was in no way in relation to the injector o-rings leaking. Or something along those lines.
