LS3 defective lifters?
Thread Starter
Teching In
Joined: Jul 2010
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LS3 defective lifters? My car is in the shop for valve train noise issues on passenger side - not extreme, but not normal either, does not go away after start up (this is a LS3 engine).
Dealer initially said he would look into oil pressure-blockage issues on that side.
1st report back from dealer yesterday, was they have determined problem is with components associated with cylinder #6 - ruled out accessible top side components, leaving problem to be either a bad lifter or bad cam.
Report today is that the lifter roller pin broke; dealer claims GM is saying only way this could happen is over rev of engine.
I have never hit red line yet (still breaking in <1,200 miles), and only came close to red line a couple times under light acceleration - besides I thought we have a rev limiter.
Strange thing is all of the parts were in place no missing needle bearings, no apparent damage to valve, push rod, rocker arm or cam. Quite puzzling.
Big issue is damage done by broken pin - it scraped the "lifter cylinder" as it worked its way out of the lifter. May have toasted the block.
Anyway if anyone knows of other instances of a lifter roller pin breaking, please let me know. I may have a fight with GM on this.
Dealer initially said he would look into oil pressure-blockage issues on that side.
1st report back from dealer yesterday, was they have determined problem is with components associated with cylinder #6 - ruled out accessible top side components, leaving problem to be either a bad lifter or bad cam.
Report today is that the lifter roller pin broke; dealer claims GM is saying only way this could happen is over rev of engine.
I have never hit red line yet (still breaking in <1,200 miles), and only came close to red line a couple times under light acceleration - besides I thought we have a rev limiter.
Strange thing is all of the parts were in place no missing needle bearings, no apparent damage to valve, push rod, rocker arm or cam. Quite puzzling.
Big issue is damage done by broken pin - it scraped the "lifter cylinder" as it worked its way out of the lifter. May have toasted the block.
Anyway if anyone knows of other instances of a lifter roller pin breaking, please let me know. I may have a fight with GM on this.
LS1Tech Sponsor
Joined: Feb 2006
Posts: 1,170
Likes: 1
From: Rockfield Kentucky
That is what I am thinking also. The LS3 has so many limits in the computer that even if you hit the limiter your not going to hurt anything. Now if you downshifted from fourth to first then it's mechanical rev and not limited by the computer.
Chances are you got a defective lifter. If you are stock there should be no question.
Good luck!
Robin
Chances are you got a defective lifter. If you are stock there should be no question.
Good luck!
Robin
Thread Starter
Teching In
Joined: Jul 2010
Posts: 4
Likes: 0
I do have some mod's that is what scares me, have CAI, suspension work etc. nothing change in/on engine or anything done that I feel can relate to the breakage.
I have been honest with the Dealer and GM letting them know everything I did.
I have good news to report, today GM gave my dealer the go ahead to replace the engine.
I have been honest with the Dealer and GM letting them know everything I did.
I have good news to report, today GM gave my dealer the go ahead to replace the engine.
