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Re: Update on Burnt Valve
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Posted by Janicholson on October 30, 2006 at 17:08:21 from (66.173.50.21):
In Reply to: Update on Burnt Valve posted by Steve200460 on October 30, 2006 at 15:33:12:
A cylinderleak down test is a good analytical next step. One closes the valves by having the cylinder on tdc compression nad locking it in that location with a combination of being in high gear, locked brakes, and possibly a wrench on the front pulley nut to hold it from turning. Then apply air pressure to the cylinder with a used sparkplug with a fitting brazed into the place where the porcelin was located. This air pressure (100psi or so) will leak out of the same spot that the compression leaks during running. One listens to the intake at the carb (with air cleaner removed), to the exhaust in the muffler, and in the oil fill hole. The hissing will reveal the location. I believe an engine that is not using major oil (smoking blue grey) and seems tight will run well with out replacing the rings etc. If it does, all you have lost is some time and a head gasket, If it doesn't you have saved a bunch of money and time. My two cents, JimN
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