Oil leak and PCV system linked?
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Teching In
Joined: Jul 2013
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From: NW suburbs Chicago
Oil leak and PCV system linked? I have a L76 from a 2008 Pontiac G8GT with headers, Texas Speed Stage 1 cam and DOD delete kit from Texas Speed. Rest of engine is stock. It is in my 68 Lemans. After cam swap and re-ringing (engine had 30K on it) I have about 100 miles on it. I will drive for about 5-10 miles and when I park it I will get an 3" diam oil spot on the floor at the rear of the engine. I can see a drip from between the block and bellhousing. Nothing is coming down from the valley cover of above. It also leaks while driving because I have an oil film under the car. A person following said it is not burning oil. My first thought was that I did not get the rear cover and crank seal installed properly, but then I thought about my PCV system (or lack of) and thinking maybe I am building up crankcase pressure and it is pushing oil out through the rear cover or seal. Is this possible? could it build up enough crankcase pressure to do this? Following is what I did for the PCV system:
- From the passenger valve cover nipple ran a line from it to my intake tube ahead of the TB
- The driver valve cover nipple I cap it off (I have also tried just leaving it open, came results; oil leak from back of engine).
- Plugged the two inlets after the TB on the intake manifold.
There is no nipple on my valley cover from the DOD kit.
PCV problem or rear cover/crank seal sealing problem?
- From the passenger valve cover nipple ran a line from it to my intake tube ahead of the TB
- The driver valve cover nipple I cap it off (I have also tried just leaving it open, came results; oil leak from back of engine).
- Plugged the two inlets after the TB on the intake manifold.
There is no nipple on my valley cover from the DOD kit.
PCV problem or rear cover/crank seal sealing problem?
Thread Starter
Teching In
Joined: Jul 2013
Posts: 31
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From: NW suburbs Chicago
Thanks, I see the post now. I have my thrread also going on the Camero portion of the site with lots of responses and my direction listed based on feedback. I am hoping I have not done that much damage as blowing the seal out. I have not taken it over 3500RPM and only 100ish miles so hopefully only leaking.
Thread Starter
Teching In
Joined: Jul 2013
Posts: 31
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From: NW suburbs Chicago
Yes I have a DOD valley cover, but it does not have a port for PCV system. I only have PCV ports on both valve covers. Sucking/blowing on the hose of the driver side there is some sort of a restriction you can feel, but on the passenger side I don't feel like any air gets through at all when sucking/blowing, which seems a little strange to me.
Teching In
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this sounds like my set up..... I have on nipple on each valve cover. do I hook the forward facing nipple on the passenger side up to vacuum and the drivers side up to fresh air or vise versa? I see the drivers side nipple has only a small hole in it.... do I need a PCV valve with this set up or is that what the small hole acts as?
Thread Starter
Teching In
Joined: Jul 2013
Posts: 31
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From: NW suburbs Chicago
Go to the following link on the conversion side of the website, scroll towards the end. It will answer your questions
https://ls1tech.com/forums/conversio...-linked-2.html
https://ls1tech.com/forums/conversio...-linked-2.html
