The quick and dirty way is to take the valve (new or good condition) and rock it back and forth ( side to side) in the guide. If you can feel it move it requires repair. (most people can feel .007 inch movement)
Properly you get a proper gauge and measure the diameter of the guide in several locations and at several points on the "clock" at each depth.
Replace the valve seal and check the valve guide for wear.
an inside micrometer
Inside Micrometer
to check the piston rings and the valve seals for wear.
There are multiple causes to intake and exhaust valve damage. These include preÊdetonation (knocking) and valve guide wear causing tracking issues.Ê
You can check the valve clearance with a valve clearance guide. Slide the guide between the valve. The guide will register the clearance.
The valve guide is a precise hole in the head that the valve stem slides in. The valve is retained by the retainer and two valve locks.
valve guides are present in the engine cylinder head.these valve guide operates the working of valves in the cylinder.that is the inlet ant the outlet valves.
A valve guide keeps the valve straight. Valve keepers keep the valve secured.
An engine valve normally needs to be removed from the head for a valve job, or to replace other parts related to its operation like the spring or valve guide. This is normally done when the engine has a poor seal from the valve/valve seat or oil consumption caused by the vavle guide.
A Hat
Ring wear, sludge buildup around the ring grooves, valve guide wear, rod and main bearing wear, camshaft and lifter pitting, oil consumption ring failure. Other than that, not much.