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J Witt · 08-23-2015, 03:44 PM

If the engine is free turning and the other three plugs are out, car in neutral, the 20psi in the cylinder is enough to push the piston down. which way depends on which side of TDC the crank is on. Put it in 1st gear and put on the hand brake.

Puff of smoke when changing gears can be a sign of loose valve guide clearance -- oil is pulled by the valve stems when the throttle is closed and burned when the throttle is opened again.

Sounds like a valve job to me, but hard to tell since the pistons moved. Perhaps an A&P mechanic among us can give a better opinion.

John

08-23-2015, 03:44 PM	#4
J Witt Senior Member Join Date: Mar 2015 Location: Acworth GA Posts: 534	Re: Questions for engine experts If the engine is free turning and the other three plugs are out, car in neutral, the 20psi in the cylinder is enough to push the piston down. which way depends on which side of TDC the crank is on. Put it in 1st gear and put on the hand brake. Puff of smoke when changing gears can be a sign of loose valve guide clearance -- oil is pulled by the valve stems when the throttle is closed and burned when the throttle is opened again. Sounds like a valve job to me, but hard to tell since the pistons moved. Perhaps an A&P mechanic among us can give a better opinion. John __________________ Houston, Tranquility base here. The Eagle has landed.