Duramax Diesels Forum Truck of the Week
  #1  
Old 10-17-2011, 04:44 AM
Hardknock1 Hardknock1 is offline
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Default Fuel in oil and oil leak

Noticed big oil leak front of engine. Checked oil level.....way too much. Drove truck like this on trip over 1000 miles before i discovered problem. I think it is the CP3. Engine is running good at highway speeds, a little rough at idle. Did I do damage to bearings or internal parts with all that fuel in the oil?
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Old 10-17-2011, 05:07 AM
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Injectors? What year is it?
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Old 10-17-2011, 05:09 AM
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What year is your truck? Sounds like a LB7, they have the most problems with fuel in oil. If it is a LB7 more likey it's injectors. I have never heard of the cp3 putting fuel in the engine oil but it could happen...
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Old 10-17-2011, 05:28 AM
Hardknock1 Hardknock1 is offline
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It is a 2003 with 118000 miles. Had a leaky injector line replaced and the system check at dealer about 20000 miles ago. no leaks and pressures were good at that time.
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Old 10-17-2011, 06:38 AM
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Sounds like one or more went bad, Have to check balance rates to see for sure, but usually a base pan full of fuel indicates a bad injector or a leaky injector line under the covers?
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Thanks to:
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Old 10-17-2011, 08:26 AM
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Yea sounds like a bad injector is filling the motor with fuel and it's coming out the crank case vent spilling onto the ground.
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Old 10-17-2011, 08:26 AM
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Right year and mileage for injectors to be bad. I would stop driving it IMMEDIATELY and check balance rates.
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Old 10-17-2011, 08:28 AM
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I'm going to bet your oil pressure is reading damn near zero at idle too.
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Old 10-17-2011, 10:06 AM
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Quote:
Originally Posted by jraymer View Post
I'm going to bet your oil pressure is reading damn near zero at idle too.
When mine went it still read normal at idle but it wouldnt go past 50 when driving
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Old 10-17-2011, 10:32 AM
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Not to hijack this thread but what is a normal oil pressure? While driving mines usually between 40 and 60 psi hot and drops down to 25 or so at idle.


Sint frum tha orijinul smert fone
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Old 10-17-2011, 10:47 AM
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My balance rates were perfectly fine while the crank case was full of fuel & leaked all over the floor. No SES light, no exhaust smoke or injector knock. More than likely injector issue. LB7s were known for having cracked injector bodies and/or ball seat erosion. Mine occurred around 100k. Bosch corrected this issue in 2008. Best way is have a dealer check for high fuel return rates.
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Old 10-18-2011, 06:06 AM
Hardknock1 Hardknock1 is offline
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Thanks everyone. Had it towed to shop. FYI Oil Pressures never changed since I bought it with 77000 miles ( 50 to 60 on highway and about 30 at idle) Truck ran great for the 1000 mile trip, got 20 mpg. was idleing a little rough, not bad before i left on the trip. should have check the oil then. was still running good before i had it towed to the shop.
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Old 10-18-2011, 06:14 AM
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I have seen more leaking return lines than cracked bodies.
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Old 10-18-2011, 08:13 AM
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Quote:
Originally Posted by 02greysixer View Post
Not to hijack this thread but what is a normal oil pressure? While driving mines usually between 40 and 60 psi hot and drops down to 25 or so at idle.


Sint frum tha orijinul smert fone
Mine is around 60 when cruising on the highway and goes up to 70 under moderate acceleration
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I kick all kinds of cars asses all the time but mainly cause they 1.) dont know we are racing & 2.) I dont hang around to tell em
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Old 09-12-2012, 07:35 PM
Mwfoshee Mwfoshee is offline
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Default Duramax oil leak

I have been wondering what has been causing my oil pressure toto show "damn near zero at idle" for awhile.

Today I came out to my 2003 duramax with 200k plus miles and found alarge oil leak. I immeadiatly checked the oil level and it was over full.

Safe bet to assume injectors?

My question is this, its it safe to drive the truck to the shop?
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