Posted by msb on March 22, 2010 at 19:37:32 from (67.236.244.190):
In Reply to: Lapping the valves posted by Ultradog MN on March 22, 2010 at 14:54:21:
FWIW, General Motors recommended their dealer shops to discontinue the practice 40 or more years ago.Their reasoning was that no matter how hard you try, you can never get all the compound off. As a result the compound keeps cutting which shortened the life of the valve seal.FIL was a service manager back then. Two things he insisted on was no lapping compound and all valve guides were to be knurled.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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