Posted by T-Nason on July 24, 2023 at 14:36:53 from (109.43.112.163):
Bought this little TO-20 awhile ago and while using it recently it seemed to develop a oil leak out of the spark plugs? I pulled all 4 and they were very much coated in black carbon. I replaced all 4 after making sure the plug holes were clean and they continue to weep. I did a compression check and got 90-90-85-80 psi. I did a oil compression test and got roughly the same psi. Seems like its a head issue? Any ideas gentlemen?
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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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