RINGS-PISTON
STANDARD PROCEDURE - PISTON RING FITTING
1. Wipe cylinder bore clean. Insert the ring and push down with piston to ensure squareness in bore to approximately 12 mm (0.50 in.) from top of cylinder bore. Check ring gap with a feeler gauge . For clearance specification (Refer to 9 - ENGINE - SPECIFICATIONS).
2. Check piston ring to groove side clearance . For clearance specification (Refer to 9 - ENGINE - SPECIFICATIONS)
REMOVAL
1. Remove piston and connecting rod. (Refer to 9 - ENGINE/ENGINE BLOCK/PISTON & CONNECTING ROD - REMOVAL)
2. Remove No. 1 and No.2 piston rings from piston using a ring expander tool .
3. Remove upper oil ring side rail.
4. Remove lower oil ring side rail.
5. Remove oil ring expander.
INSTALLATION
1. Install rings with manufacturers I.D. mark (if present) facing up, to the top of the piston .
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.
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 .
3. Install upper side rail first and then the lower side rail.
4. Install No. 2 piston ring and then No. 1 piston ring.
5. Position piston ring end gaps as shown.
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.