To keep the rings from rotating on 2 stroke engines. You will not see this on 4 stroke engines.
The DNJ ring spec. information, printed on each compression ring (located next to the piston ring gap), is installed facing the top of the piston for both the top (#1) and middle (#2) compression piston ring slots. The oil control ring can be installed just like any other oil control ring in the bottom (#3) piston ring slot.
With a piston ring compressor.
Not enough information.
Generally in grooves near the top of the piston. The compression rings, near the top and the oil rings at the bottom of the top. The ring gaps are staggered.
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.
The purpose of a piston ring expander is to make it easier remove and install piston rings. Because of the low torque they use, they help to prevent damage to the piston rings.
The bottom ring in a piston with three rings is typically the oil control ring. Its purpose is to regulate the amount of oil that reaches the cylinder wall to maintain proper lubrication without excess oil consumption.
You have to disassemble the entire engine, remove the piston and check the rubber ring around that piston.
The DNJ ring spec. information, printed on each compression ring (located next to the piston ring gap), is installed facing the top of the piston for both the top (#1) and middle (#2) compression piston ring slots. The oil control ring can be installed just like any other oil control ring in the bottom (#3) piston ring slot.
a piston ring is not calibrated. You just slide the new one in place
The DNJ ring spec. information, printed on each compression ring (located next to the piston ring gap), is installed facing the top of the piston for both the top (#1) and middle (#2) compression piston ring slots. The oil control ring can be installed just like any other oil control ring in the bottom (#3) piston ring slot.
one ring per piston, the pistons have a groove in it where the ring fits on.
You mean a piston ring. It seals the gap between the piston and the chamber in your engine
The lowest ring is the oil ring
With a piston ring compressor.
There is a special tool for this purpose. Should be able to buy it or rent it at your local auto parts store.
The "D" on a piston ring typically indicates the cylinder bore diameter for which the ring is intended. The "N" refers to the ring's position on the piston, such as top, middle, or oil control ring. Together, "D N" specifies the ring's size and location within the engine.