edneyens
07-14-2010, 11:29 PM
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.