Losing oil..HELP
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Joined: Dec 2006
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Losing oil..HELP
I am the office manager for a large Diesel repair shop. We recently performed an inframe on a 1993 F350 7.3L turbo diesel. Somewhere, someway, this vehicle loses about 12 qts per 100 miles. There are no visable leaks. No wetness on the underside. NO drops on the floors. We have checked the turbo lines..they are dry..I have driven behind and beside this vehicle to check for anything while in motion. We have nothing. Normal smoke for a diesel. We have 5 mechanics with over 100 years exp. and this is kicking our butts..other than this problem..the owner says his truck is running better than it ever has...does anyone have a clue?
Senior User
Joined: Oct 2006
Posts: 210
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From: Welland, On
Just a thought. I had a friend that had a turbo 4 cylinder mustang. The turbo had an oil pressure line and an oil leak past a seal or something that would cause lots of oil consumption. Being a gas engine, you could see it and smell the oil coming out the exhaust. I don't know if this would be apparent with the diesel or if the quantity of oil mixed with diesel would be noticable. I own a 6.9 without turbo so I am not a turbo expert, but as soon as I read your post, it brought my friends car to mind.
Elder User
Joined: Sep 2006
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I have an 84 IDI with high oil consumption [no leeks, engine is clean] as well but I have a pretty good idea where it is going....when I'm towing, I have very EGT's and I belive it is due to excessive oil in the cylinders?!!
Elder User
Joined: Sep 2005
Posts: 641
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From: Delta B.C.
Holy crap!!!
12 qrts per 100 miles.... thats a whole bunch of oil...
I guess there are only 3 places oil can go...
1) Out the tail pipe
2) into the coolant
3) onto the ground
Why was the engine rebuilt? was it because of oil loss??
I will assume that because it was an in frame that it was just honed and re-ringed...
What exactly did you guys do when you re-built it??
12 qrts per 100 miles.... thats a whole bunch of oil...
I guess there are only 3 places oil can go...
1) Out the tail pipe
2) into the coolant
3) onto the ground
Why was the engine rebuilt? was it because of oil loss??
I will assume that because it was an in frame that it was just honed and re-ringed...
What exactly did you guys do when you re-built it??
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
My first guess and I mean that would be an oil leak into the turbo from a seal... Maybee the increased performance is from the disappearing oil. Where is the CDR located....????
WHERE does the return oil from the TURBO dump back into the engine.......valley pan.........???????
WHERE does the return oil from the TURBO dump back into the engine.......valley pan.........???????
Last edited by PLC7.3; Dec 26, 2006 at 04:17 PM.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Nightf10182003,
Welcome to FTE and the IDI diesel forum.
My money is on the CDR diaphragm being ruptured.
The engine is using the oil for high BTU fuel, hence it runs very good.
It could be the turbo seal, but I would think you would see blue smoke at low RPM.
Since you said inframe, I assume the rings were not touched, how many miles on the engine?
Extra blow by on a high mileage engine and a bad CDR could cause a lot of oil to dissapear at higher RPM.
Pull the air cleaner top off the turbo and see if the turbo is all oily on the inside.
If that is clean, pull the hat off the intake manifold.
Oil on the turbo impeller would be the CDR.
Oil after the turbo in the intake would be the turbo oil seal.
Also if the valley pan was replaced, did you punch holes in the shield under the turbo drain?
That must not be the problem though or it would show up on the ground.
I am assuming this is either a factory turbo or an ATS unit.
Welcome to FTE and the IDI diesel forum.
My money is on the CDR diaphragm being ruptured.
The engine is using the oil for high BTU fuel, hence it runs very good.
It could be the turbo seal, but I would think you would see blue smoke at low RPM.
Since you said inframe, I assume the rings were not touched, how many miles on the engine?
Extra blow by on a high mileage engine and a bad CDR could cause a lot of oil to dissapear at higher RPM.
Pull the air cleaner top off the turbo and see if the turbo is all oily on the inside.
If that is clean, pull the hat off the intake manifold.
Oil on the turbo impeller would be the CDR.
Oil after the turbo in the intake would be the turbo oil seal.
Also if the valley pan was replaced, did you punch holes in the shield under the turbo drain?
That must not be the problem though or it would show up on the ground.
I am assuming this is either a factory turbo or an ATS unit.
Last edited by Dave Sponaugle; Dec 26, 2006 at 07:53 PM.
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Senior User
Joined: Oct 2006
Posts: 210
Likes: 2
From: Welland, On
Sorry to be a little off topic, but just so I can understand the responses better, could someone explain the meanings of:
EGT's
IDI
BTU (British Thermal Units?)
ATS (aftermarket turbo s??)
I believe that CDR is the crankcase depression regulator?
BTW, is there a FAQ page where acronyms are decoded? I did look before I posted but had no luck.
Thanks
EGT's
IDI
BTU (British Thermal Units?)
ATS (aftermarket turbo s??)
I believe that CDR is the crankcase depression regulator?
BTW, is there a FAQ page where acronyms are decoded? I did look before I posted but had no luck.
Thanks
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
iron1951,
Welcome to FTE and the IDI diesel forum.
EGT - exhaust gas temperature - pistons melt at 1250 degrees -easy to reach if you turn the fuel up on a diesel
IDI - Indirect injection - 1983 thru early 1994 diesels were IDI
BTU - british thermal unit - amount of heat contained in a quantity of fuel in this instance
ATS - Advanced Turbo Systems - designed the original Ford turbo system as well as an aftermarket supplier of turbo systems
You are correct on the CDR.
There were some decoders, but they are being overhauled at the present time.
When they come back they will be in the articles and specs section.
Welcome to FTE and the IDI diesel forum.
EGT - exhaust gas temperature - pistons melt at 1250 degrees -easy to reach if you turn the fuel up on a diesel
IDI - Indirect injection - 1983 thru early 1994 diesels were IDI
BTU - british thermal unit - amount of heat contained in a quantity of fuel in this instance
ATS - Advanced Turbo Systems - designed the original Ford turbo system as well as an aftermarket supplier of turbo systems
You are correct on the CDR.
There were some decoders, but they are being overhauled at the present time.
When they come back they will be in the articles and specs section.
