Piston: Description and Operation

10. Piston
- The piston skirt has a "slipper" design to reduce weight and sliding friction. The oil control ring groove utilizes a slit design.
- The piston pin is located in an offset position. The Nos. 1 and 3 pistons are offset in the lower direction while the Nos. 2 and 4 pistons are offset in the upper direction.
- The piston head is recessed for both the intake and exhaust valves. It also has symbols used to identify the location and the direction of installation. Due to the uniformity of the shape of the recess for the intake valve and the recess for the exhaust valve, the piston is common to both the right and left banks.
- Three piston rings are used for each piston-two compression rings and one oil ring. The top piston ring has an inner-bevel design and the second piston ring has an interrupt design to reduce oil consumption.