Exhaust Valve Guide Clearance at Jesse Dedmon blog

Exhaust Valve Guide Clearance. Too loose and the guide can hold the valve exactly perpendicular to the seat, and both the head of the valve and the seat get beat up. Too tight and the valve can stick in the guide when the engine gets hot. The clearance between the valve stem and the valve guide is between.002’’ and.004’’ for the exhaust and.001’’ to.003’’ for the intake. The clearance requirements differ between intake and exhaust for obvious reasons of expansion differences between the guide and. A play of.017’’ is acceptable, everything above that is considered loose and needs replacing. If a valve replacement is required, the clearance between valve stem and inner guide diameter must not exceed the specified values. The clearance is intentionally tight so that the valve can’t wobble and. 7” bore engine with.375” valve stems. The clearance between the valve stem and the guide in the head is a critical dimension. The exhaust guides usually require. If the valve guide isn’t excessively worn, there’s not much clearance between the guide and the valve stem. I was recently measuring valve stem to valve guide clearance on a high output diesel. I'd shoot for.0012 intake and.0017 exhaust, assuming perfectly straight honed bronze guides and the exhaust valve stem has a little.

The exhaust guides usually require. The clearance between the valve stem and the valve guide is between.002’’ and.004’’ for the exhaust and.001’’ to.003’’ for the intake. If the valve guide isn’t excessively worn, there’s not much clearance between the guide and the valve stem. Too tight and the valve can stick in the guide when the engine gets hot. The clearance between the valve stem and the guide in the head is a critical dimension. I'd shoot for.0012 intake and.0017 exhaust, assuming perfectly straight honed bronze guides and the exhaust valve stem has a little. The clearance requirements differ between intake and exhaust for obvious reasons of expansion differences between the guide and. If a valve replacement is required, the clearance between valve stem and inner guide diameter must not exceed the specified values. The clearance is intentionally tight so that the valve can’t wobble and. A play of.017’’ is acceptable, everything above that is considered loose and needs replacing.

Repair Guides Engine Mechanical Components Valve Lash (clearance

Exhaust Valve Guide Clearance 7” bore engine with.375” valve stems. Too loose and the guide can hold the valve exactly perpendicular to the seat, and both the head of the valve and the seat get beat up. The clearance between the valve stem and the valve guide is between.002’’ and.004’’ for the exhaust and.001’’ to.003’’ for the intake. The clearance requirements differ between intake and exhaust for obvious reasons of expansion differences between the guide and. The clearance is intentionally tight so that the valve can’t wobble and. A play of.017’’ is acceptable, everything above that is considered loose and needs replacing. I'd shoot for.0012 intake and.0017 exhaust, assuming perfectly straight honed bronze guides and the exhaust valve stem has a little. If the valve guide isn’t excessively worn, there’s not much clearance between the guide and the valve stem. The clearance between the valve stem and the guide in the head is a critical dimension. Too tight and the valve can stick in the guide when the engine gets hot. I was recently measuring valve stem to valve guide clearance on a high output diesel. The exhaust guides usually require. If a valve replacement is required, the clearance between valve stem and inner guide diameter must not exceed the specified values. 7” bore engine with.375” valve stems.