LS2 Noise...Need help.
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On The Tree
Joined: Oct 2015
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From: Space Coast Florida
LS2 Noise...Need help. Note: Just realized I posted this in external. I'll copy to internal.
Details. 07 CTS-V, LS2, 142k Miles
At 142k miles I lost a lifter (left side, 2nd from front) and a chunk of it broke off. Long story short, I tore the top end down, put in new LS7 lifters, BTR3 cam, dual valve springs, titanium retainers, new push rods, upgraded trunions and found the chunk of lifter in the oil pan. This problem is NOT top end related.
When I first heard this sound, I thought it was the oil pump. I was spinning the crank with heads off and no chain on the cam yet and heard it. This is why I say it's not top end related. The sound when spinning by hand almost sounds like something solid scraping up against something thin. Which leads us up to my current status.
I have the front subframe dropped, the oil pan off, and the windage tray out (thought crank was scraping the windage tray from setting engine down on pan). Turns out this is not the issue. So now, I have the engine suspended by straps from the strut bar, an open bottom end and am not sure where to go next.
I found a broken rubber gasket in the oil pick up tube. It looks like the one that goes on the crank snout for the harmonic balancer. I'm not sure if this has anything to do with the noise or not.
Below videos are car running with the new cam in, and spinning the crank by hand.
I'm open for any suggestions and questions.
Details. 07 CTS-V, LS2, 142k Miles
At 142k miles I lost a lifter (left side, 2nd from front) and a chunk of it broke off. Long story short, I tore the top end down, put in new LS7 lifters, BTR3 cam, dual valve springs, titanium retainers, new push rods, upgraded trunions and found the chunk of lifter in the oil pan. This problem is NOT top end related.
When I first heard this sound, I thought it was the oil pump. I was spinning the crank with heads off and no chain on the cam yet and heard it. This is why I say it's not top end related. The sound when spinning by hand almost sounds like something solid scraping up against something thin. Which leads us up to my current status.
I have the front subframe dropped, the oil pan off, and the windage tray out (thought crank was scraping the windage tray from setting engine down on pan). Turns out this is not the issue. So now, I have the engine suspended by straps from the strut bar, an open bottom end and am not sure where to go next.
I found a broken rubber gasket in the oil pick up tube. It looks like the one that goes on the crank snout for the harmonic balancer. I'm not sure if this has anything to do with the noise or not.
Below videos are car running with the new cam in, and spinning the crank by hand.
I'm open for any suggestions and questions.
Last edited by tlorenzen; Feb 25, 2017 at 10:36 PM.
