Piston Ring: Service and Repair
FITTING PISTON RINGSCheck Gap On Piston Rings:
1. Wipe cylinder bore clean. Insert ring and push down with piston to ensure it is square in bore. The ring gap measurement must be made with the ring positioning at least 16 mm (0.63 inch) from bottom of cylinder bore. Check gap with feeler gauge. Refer to Piston Ring Specification Chart.
PISTON RING SPECIFICATION CHART
Piston Ring Clearance:
2. Check piston ring to groove clearance. Refer to Piston Ring Specification Chart.
PISTON RINGS-INSTALLATION
Piston Ring-Installation:
1. The No. 1 and No. 2 piston rings have a different cross section. Install rings with manufacturers mark and size mark facing up, to the top of the piston.
CAUTION: Install piston rings in the following order:
a. Oil ring expander.
b. Upper oil ring side rail.
c. Lower oil ring side rail.
d. No. 2 Intermediate piston ring.
e. No. 1 Upper piston ring.
Side Rail-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.
3. Install upper side rail first and then the lower side rail.
Installing Upper And Intermediate Rings:
4. Using a piston ring expander, install No. 2 piston ring and then No. 1 piston ring.
Piston Ring End Gap Position:
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.
Identify Piston And Rod Assembly For Cylinder Installation:
7. Connecting rod front mark 72 must always face forward, toward timing belt end.
8. Install the piston and connecting rod assembly into there respective bore from the cylinder block top.
CAUTION: Piston assemblies are not to be interchanged from bank to bank.
Connecting Rod And Cap:
9. Check alignment marks made during disassembly and that bearing position notches new or used are on the same side.
10. Install the following components:
^ Oil pan
^ Cylinder heads
^ Timing belt
^ Cylinder head covers
^ Intake manifold/plenum