Slide one of the compression rings down into the cylinder and measure the gap with a feeler gauge.
Piston ring gap.
There is no clearance of the ring to the block. The ring works in contact with the block to seal the combustion chamber and provide oil control.
To measure the piston ring side clearance, first, install the piston ring onto the piston and place them in the cylinder bore. Use a feeler gauge to measure the gap between the ends of the ring when it is positioned in the bore. The thickness of the feeler gauge that fits snugly in the gap indicates the side clearance. Ensure that the measurements are taken at multiple points for accuracy, as the clearance can vary due to wear or manufacturing tolerances.
You have to disassemble the entire engine, remove the piston and check the rubber ring around that piston.
assuming that you have new cylinder liners and pistons or old pistons with good ring groove conditions, piston rings come with the correct/specified clearance when bought new.
ALumnium Ferrous INsert PistonIt is a bi-metrallic piston, consisting of a body of aluminum alloy and a wear resistant cast iron inserted for the top grove. The top grove is fitted with a steel chrome in land ring. Which will give a enhanced piston life.
Yes , the steel(compression) ring goes on top ; see the related link to a video tutorial .
As the piston moves up and down in the cylinder it also moves the piston rings up and down in the grooves. With the rings moving up and down it gradually increases the side clearence. Material is taken off from both the piston groove and the ring.
ALumnium Ferrous INsert PistonIt is a bi-metrallic piston, consisting of a body of aluminum alloy and a wear resistant cast iron inserted for the top grove. The top grove is fitted with a steel chrome in land ring. Which will give a enhanced piston life.
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.
The clearance between the piston and cylinder is maintained by the piston rings, the ring centers the piston within the cylinder bore and is the device that seals the cylinder bore and creates and maintains the pressure created by the piston movement in the bore. When assembling an engine you will need to check and set end gap of the rings, this is done by centering the new ring in the bore and measuring the gap between the ring ends, you can measure this distance with feeler gauges and adjust by filing the ends of the rings to increase to the recommended tolerance, this tolerance is measured in .000 of an inch and different engines require different end gaps. This end gap is determined by the diameter of the bore with the greater the bore diameter than the greater the end gap,.
Totally confusing question hope this question may by as "Fluid is leaking to down port and hence lever is moving down. What is to be done to hold lever in the up position?" If the question is as above then there is an inter-port leakage due to failure of O-Ring or oil-seal or piston ring. This arrangement may be enhanced by using a piston cylinder arrangement. Also inter-port leakage is possible if cylinder size variation due to wear on long usage. It is better to check following points. Check whether Oil-seal/O-ring/Piston ring damaged. Check cylinder and piston clearance. Check whether rated oil grade is used. This will sort out the issue.