Installation

PISTON RINGS-INSTALLATION

Piston Ring Installation:

The No. 1 and No. 2 piston rings have a different cross section. Install rings with manufacturers I.D. mark facing up, to the top of the piston.

CAUTION: Install piston rings in the following order:

1. Oil ring expander.
2. Lower oil ring side rail.
3. Upper oil ring side rail.
4. No. 2 intermediate piston ring.
5. No. 1 upper piston ring.

Side Rail-Installation:

6. 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.
7. Install lower side rail first and then the upper side rail.

Upper And Intermediate Ring-Installation:

8. Install No. 2 piston ring and then No. 1 piston ring.

Piston Ring End Gap Position:

9. Position piston ring end gaps as shown in above image.
10. 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.