Piston Ring(s) - Installation

INSTALLATION

1. Install rings with manufacturers I.D. mark (if present) facing up, to the top of the piston (Figure 1).

CAUTION: Install piston rings in the following order:

- Oil ring expander.
- Upper oil ring side rail.
- Lower oil ring side rail.
- No. 2 Intermediate piston ring.
- No. 1 Upper piston ring.




Figure 1 Piston Ring Installation






2. Install the side rail 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. Do not use a piston ring expander (Figure 2).
3. Install upper side rail first and then the lower side rail.




Figure 2 Oil Ring Side Rail - Typical


1 - SIDE RAIL END

4. Install No. 2 piston ring and then No. 1 piston ring (Figure 3).




Figure 3 Piston Ring Installation

5. Position piston ring end gaps as shown in (Figure 4).
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.




Figure 4 Piston Ring End Gap Position