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Valve clearence

Tiny
BONESMIKE
  • MEMBER
  • 2002 NISSAN FRONTIER
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 19,900 MILES
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?
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Saturday, January 16th, 2021 AT 12:22 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Saturday, January 16th, 2021 AT 9:21 AM

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