Piston Ring Installation Procedure
- Properly orient the oil control ring expander as shown before installation. The ends of the expander must be facing toward the top of the piston.
- Using a piston ring expander, install the oil control ring assembly using the following procedure:
- Install the expander ring (3).
- Install the 2 oil scraper rings (4). Expand the rings only enough to clear the piston diameter. Overexpanding the piston rings will distort or crack the rings.
- Install the lower compression piston ring (2) onto the piston with the mark facing the top of the piston.
- Install the upper compression piston ring (1) onto the piston with the mark facing the top of the piston, if required.
- Once the rings are installed, set the ring gaps for the oil control, second and top ring as follows. Use the piston location arrow for reference.
- Lower oil control ring - position 1
- Upper oil control ring - position 2
- Top Ring - position 3
- Oil control ring expander - position 4
- Second ring - position 5
NOTE:
The lower compression piston ring (2) is thicker and will not fit in the upper compression rings (1) position.
NOTE:
For the LY7, the upper compression ring is symmetrical and may be installed either side up. For all other RPO's, the mark on the piston ring should face the top of the piston.