2001 lb7 oil from crankcase vent - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 02-19-2012, 12:27 PM   eBay Motors  #1 (permalink)
 
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2001 lb7 oil from crankcase vent

Hi everyone, I've been searching and I know there's already threads on this but they dont seem to match what mine is doing. I just purchased this truck last week, my first diesel. It has 132000 miles. It has new injectors put in a few months ago. I was under it last night trying to rip off my brake backing plate that decided to fall off 100 miles from home and i noticed oil coming from the crankcase vent that has been leaking and running back. I don't remember the leak being there when I looked at the truck. The oil does not smell like fuel and the truck seems to run perfect. But when I checked the dipstick after sitting overnight it seems overfull. Where do i start with this? An oil change and monitor the level? Is there something that can be cleaned that could be plugged causing excessive pressure? Any input is greatly appreciateted, I'm getting more and more frustrated with this truck
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Old 02-19-2012, 12:41 PM   eBay Motors  #2 (permalink)
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start wil an oil change and keep an eye on the level better to feel the oil between finger and thumb to see if there is fuel in it than smell it can be hard to smell pcv valve mabe could be excessive blow by
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Old 02-19-2012, 12:54 PM   eBay Motors  #3 (permalink)
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Pull dipstick out and put drop of oil on paper towel. Does a ring form around the oil?


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Old 02-19-2012, 02:33 PM   eBay Motors  #4 (permalink)
 
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I dont think so, but heres a pic


and here is a pic of the leak


what do you think?
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Old 02-19-2012, 02:54 PM   eBay Motors  #5 (permalink)
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Mine was doing the same thing when it make making oil....

You best bet is to drain the oil and see how much comes out. You should get 10QTS of oil.

You'll need more oil on the paper towel to see if its making oil.
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Old 02-19-2012, 03:39 PM   eBay Motors  #6 (permalink)
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I ran into this on an lb7 just a short time ago. I changed the PVC valve which actually is a little rubber diaphragm that looks like a carbureators accelerator pump. It's located on the drivers side valve cover. It's held down by 4 Phillips head screws. Only takes about 5-10 minutes to change. It's cheap and easy. I would do an oil change and change the pcv and then monitor it.
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Old 02-19-2012, 04:27 PM   eBay Motors  #7 (permalink)
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Quote:
Originally Posted by xsivspeed454 View Post
I ran into this on an lb7 just a short time ago. I changed the PVC valve which actually is a little rubber diaphragm that looks like a carbureators accelerator pump. It's located on the drivers side valve cover. It's held down by 4 Phillips head screws. Only takes about 5-10 minutes to change. It's cheap and easy. I would do an oil change and change the pcv and then monitor it.
Do all LB7's have PCV's? This is the first time Ive heard this about LB7's
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Old 02-19-2012, 05:09 PM   eBay Motors  #8 (permalink)
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I believe they all have the PCV system no matter what emission level the truck is. The one I was working on was loaded with all the emissions crap and it had one. My 03 doesn't have any emissions stuff on it (from the factory) and mine has one. All engines have a PCV system as far as I know.
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Old 02-19-2012, 05:16 PM   eBay Motors  #9 (permalink)
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Huh... Guess you learn something new every day......
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Old 02-19-2012, 05:16 PM   eBay Motors  #10 (permalink)
 
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Thanks for the replies! Tomorrow I will hopefully change the oil and check on getting a pcv valve. It is not a California emissions truck.
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