valve clearence

2002 NISSAN FRONTIER
19,900 MILES • 2.3L • 4 CYL • 2WD • AUTOMATIC
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BONESMIKE
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  • 21 POSTS
I have the truck listed above dual overhead cams. had a new head with new bolts and chin 4 months later the pin sheared causing the chain not to turn. did this hit the valves since the timing chain failed or is there a tolerance where it will not hit the valves?
Jan 16, 2021 at 12:22 AM
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ASEMASTER6371
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Good morning,

This has resulted in valve damage and possible piston damage. When the valve timing is off, there is no clearance for the piston and valves.

https://www.2carpros.com/articles/how-a-timing-belt-works

I would be very concerned as to why the pin broke. That tells me the cam locked up. That only happens when there is a lack of oil to the head.

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure

Roy
Jan 16, 2021 at 9:21 AM