Piston Ring(s) - Installation

INSTALLATION





1. Measure clearance of piston rings to the cylinder bore and piston. Procedures
The No. 1 and No. 2 piston rings have a different cross section. Ensure that which ever design No. 2 ring is installed, it is installed with manufacturers I.D. mark (dot) facing up, towards top of the piston Description and Operation.

CAUTION: Install piston rings in the following order:
Do not use a piston ring expander during this step.
- Oil ring expander.
- Lower oil ring side rail.
- Upper oil ring side rail.
- No. 2 Intermediate piston ring.
- No. 1 Upper piston ring.





2. Install the side rail (1) by placing one end between the piston ring groove and the expander. Hold end firmly and press down the portion to be installed until side rail is in position.




The No. 1 and No. 2 piston rings have a different cross section. Ensure that when the No. 2 ring is installed, it is installed with manufacturers I.D. mark facing up, towards top of the piston Description and Operation.

3. Install upper side rail first and then the lower side rail.
4. Install the No. 2 piston ring and then No. 1 piston ring.




5. Position piston ring end gaps.
6. Position oil ring expander gap at least 45° from the side rail gaps but not on the piston pin center or on the thrust direction. Staggering ring gap is important for oil control.