Number 1 cylinder is on passenger side front of engine. Remove all the spark plugs and place you thumb over the #1 plug hole. Turn the engine until you feel the piston come up on the compression stoke. It will push at your thumb on the compression stroke. You can then insert a long screwdriver in the hole and touch the top of the piston. Turn the engine over by hand very, very, slowly until the piston is at TDC. Caution: Do not do this with the starter, turn it over by hand.
The way the question is phrased the answer is zero. But I suspect that you mean ring gap, and rule of thumb is .002 inches per inch of bore.
One of the parts in the piston are the piston head,
Number 1 cylinder is located drivers side, front of engine. Remove all spark plugs, rotate the engine by hand until # 1 piston is at TDC on the compression stroke. There are several ways to find this out. One way to find #1 on the distributor is to place your thumb over #1 plug hole and rotate the engine until you feel it pushing at your thumb. Now place a long screwdriver into the plug hole and touch the piston, rotate very slowly until the piston reaches the top. Remove the distributor cap and the rotor will now be pointing to #1.
A bent engine piston is a reference to the piston rod. The piston cannot be bent, but the piston rod can be bent.
The driving force action on the piston is called piston effort.In other words the net resultant of all the other forces acting on the piston is called piston effort.
The piston rings create a seal between the piston and the cylinder wall.
There is the penis, the testicles, the scrotum, the prostate, the sperm duct etc.
thumb nail, thumb tack, thumb screw, thumb print
A piston seal is a gasket designed to keep fluid from leaking around the piston. Piston seals are commonly used in brake calipers.
The piston doesn't twist it's way out. There is a ratchet screw adjustment that takes up the slack behind the piston. Screwing the piston back in resets the adjustment.
It is a spring metal sleeve that goes over a piston to compress the rings so that the piston can be install in the motor. It tightens down on the piston, forcing the rings into the grooves in the piston then you tap it into the cylinder.