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SG4247 · 01-17-2025, 07:55 PM

Looks to me like both the cams are timed to each other correctly. To me that rules out phasers.

But both cams are not timed to the crank properly. It is off a little.

How can this be? Maybe main timing chain has stretch. Or the main chain tensioner is not taking up the chain slack, due to low oil pressure. At 50k miles my main chain and crank gear had significant wear. My car has been driven extremely hard, I could hear the chain noise on start up for a few seconds until oil pressure made the tensioner take up slack. I replaced the chain, gear, tensioner and galley gaskets and now that noise is gone. I never had any codes, just noise.

Has the front cover ever been off? Galley gaskets and seals replaced?

01-17-2025, 07:55 PM	#2 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 797 Drives: 2010 touring Rep Power: 7842	Looks to me like both the cams are timed to each other correctly. To me that rules out phasers. But both cams are not timed to the crank properly. It is off a little. How can this be? Maybe main timing chain has stretch. Or the main chain tensioner is not taking up the chain slack, due to low oil pressure. At 50k miles my main chain and crank gear had significant wear. My car has been driven extremely hard, I could hear the chain noise on start up for a few seconds until oil pressure made the tensioner take up slack. I replaced the chain, gear, tensioner and galley gaskets and now that noise is gone. I never had any codes, just noise. Has the front cover ever been off? Galley gaskets and seals replaced? __________________ NA on E85 - 12.402 @ 112 mph 100 shot E85 - 11.589 @ 117 mph JWT C2 cams rev Base Circle & Titan Valves Last edited by SG4247; 01-17-2025 at 07:59 PM.