Engine Gurus - Need help...
Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
Engine Gurus - Need help...
Please bear with me as I try to explain in as little detail as possible as not to lose your attention.
Background:
1999 FRC stock LS1 134K miles on the clock.
Problem:
Broken pushrod on #5 intake side. Lots of oil entering the cylinder causing massive smoke.
I obvioulsy twisted the the thing a little too hard and broke the pushrod, but that's not my concern/confusion. The issue is this. As soon as the pushrod broke, the car started smoking like a 5 alarm fire out of the left side exhaust -so much so that I honestly thought the car had caught on fire.
I pulled all of the left bank spark plugs to do a compression test before pulling the head and the #5 cylinder was blowing oil out of the hole and onto the frame rail of the car. That's obvioulsy where the smoke was coming from, but it didn't crack the piston and the head gasket was 100% intact so where could the oil be coming from?
1st pic shows #5 intake pushrod. 2nd pic is #5 and #7 piston.
Background:
1999 FRC stock LS1 134K miles on the clock.
Problem:
Broken pushrod on #5 intake side. Lots of oil entering the cylinder causing massive smoke.
I obvioulsy twisted the the thing a little too hard and broke the pushrod, but that's not my concern/confusion. The issue is this. As soon as the pushrod broke, the car started smoking like a 5 alarm fire out of the left side exhaust -so much so that I honestly thought the car had caught on fire.
I pulled all of the left bank spark plugs to do a compression test before pulling the head and the #5 cylinder was blowing oil out of the hole and onto the frame rail of the car. That's obvioulsy where the smoke was coming from, but it didn't crack the piston and the head gasket was 100% intact so where could the oil be coming from?
1st pic shows #5 intake pushrod. 2nd pic is #5 and #7 piston.
Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
I'll be putting on a different set of heads, so if these are ruined it's no big deal. I just don't want to go through all the trouble to put it all back together and find that there's a problem in the cylinder. I just can't imagine how there could be.
Le Mans Master
Joined: Oct 2002
Posts: 6,855
Likes: 2
From: Grovetown GA
I know you probably did already - did you check for a groove in the cylinder wall?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Examine the Valve Guide seal, the area around the valve guide for cracks/damage. If that area or the seal is damaged,,you will get oil in the cylinder.
Heres a post of a guy that may need a LS1 head if your getting rid of yours:
http://www.c5forum.com/cgi-bin/ultim...ic/1/2020.html
Heres a post of a guy that may need a LS1 head if your getting rid of yours:
http://www.c5forum.com/cgi-bin/ultim...ic/1/2020.html
Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
Thanks guys.
Jeff - I have not rotated the engine to examine the cyl walls. Will do that tonight.
Bill - I'll check those items tonight as well. Nothing seemed out of the ordinary, but I didn't look very hard since it was after midnight.
Jeff - I have not rotated the engine to examine the cyl walls. Will do that tonight.
Bill - I'll check those items tonight as well. Nothing seemed out of the ordinary, but I didn't look very hard since it was after midnight.
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Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
Le Mans Master
Joined: Oct 2002
Posts: 6,855
Likes: 2
From: Grovetown GA
- It is tough to spend money on LS1 heads so they need to be almost free...According to my engine builder the 2004 LS1 heads are the best.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Have you checked out this post?????
http://forums.corvetteforum.com/c5-t...post1573996360
Looks like you have the same shifting issues to work on.
http://forums.corvetteforum.com/c5-t...post1573996360
Looks like you have the same shifting issues to work on.
Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
Le Mans Master
Joined: Oct 2002
Posts: 6,855
Likes: 2
From: Grovetown GA