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boosting the crankcase/ oil leak

Old Dec 5, 2010 | 08:09 PM
  #11  
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Mine did the same exact thing when i wasted #7 piston.
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Old Dec 5, 2010 | 08:33 PM
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Originally Posted by SLO TRUCK
Mine did the same exact thing when i wasted #7 piston.
Elaborate please? puked mad oil out of the rear main?

Mine wont blow out the dipstick tube after the breather fix,

This is a forged motor with IIRC 7k na miles, and around 50 maybe boosted by me. Prev owner boosted it around 3k miles IIRC
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Old Dec 5, 2010 | 09:02 PM
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We waited for you this weekend to put it on the lift and inspect it while it is running.
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Old Dec 5, 2010 | 09:10 PM
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coyote hunting took up alot of my time lol , and I have hw and a test tomorrow at 8 am
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Old Dec 5, 2010 | 09:13 PM
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Well i had a similar situation about two years ago. i wasn't losing oil to bad just a bit. but i had tons of blow by out the exhaust and each valve cover. blow by was so bad it would push the dipstick out of tube. end up doing a compression test. #7 cylinder was about 60psi lower than all other cylinders. ended up being a cracked piston. So id start with a compression test. ill bet youll find the problem there.
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Old Dec 5, 2010 | 09:22 PM
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My truck went lean after i turned the boost up too much. Here is a pic of the damage. Oil coming out of the back near the rear main seal, breather vents, and dip stick. It took me 5 gallons of oil to make it 500 miles home. LOL



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Old Dec 5, 2010 | 09:59 PM
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Sweet pics of the piston. Your lucky it made 100 miles what did the cyl look like? Just a thought but are you sure that the rear cover and the pan are mated properly kinda why kent moore makes the big tool kits for these ls based motors to assure alingmnt of covers. Just putting it out there.
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Old Dec 5, 2010 | 10:10 PM
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You got some ***** turning the boost up being that far away from home, Im too big of a pansy
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Old Dec 6, 2010 | 12:05 AM
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Originally Posted by pkozera
Sweet pics of the piston. Your lucky it made 100 miles what did the cyl look like? Just a thought but are you sure that the rear cover and the pan are mated properly kinda why kent moore makes the big tool kits for these ls based motors to assure alingmnt of covers. Just putting it out there.
I am pretty sure they were. The rear cover had never been off. I guess I cant say that I was 100% sure. There was never a oil leak issue before so I would assume it was good.

Originally Posted by 1slow01Z71
You got some ***** turning the boost up being that far away from home, Im too big of a pansy
My saying is. Boost even makes smart people do dumb things.
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Old Dec 6, 2010 | 01:15 AM
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Originally Posted by brent1976
Check the oil pressure sensor, behind the manifold. I cracked mine, and thought it was a rear main, or oil pan for about 2 weeks. I also thought the manifold had a vacuum leak, and when I went to replace the intake gaskets, oil was all over the back of the motor.
where is this at? my sensor has been a bit wierd, and i get oil on the driveway every night..the rear main is new, and i can see inside the trans inspection hole and there is no oil in there, it just runs down both sides of the motor and drips off the bottom of the pan..
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