PISTON RING FITTING
PISTON RING END GAP
NOTE: Before reinstalling used rings or installing new rings, the ring clearances must be checked.
1. Wipe the cylinder bore clean.
2. Insert the ring in the cylinder bore.
NOTE: The ring gap measurement must be made with the ring positioned at least 12 mm (0.50 inch.)
from bottom of cylinder bore.
3. Using a piston, to ensure that the ring is squared in the cylinder bore, slide the ring downward into the
cylinder.
4. Using a feeler gauge check the ring end gap.
Replace any rings not within specification.
PISTON RING SIDE CLEARANCE
NOTE: Make sure the piston ring grooves are clean and free of nicks and burrs.
1. Measure the ring side clearance as shown make sure the feeler gauge (1) fits snugly between the
ring land and the ring. Replace any ring not within specification.
2. Rotate the ring around the piston, the ring must rotate in the groove with out binding.
PISTON RING INSTALLATION
NOTE: The No. 1 and No.2 piston rings have a different cross section. Ensure No.2 ring is installed
with manufacturers 1.0. mark (Dot) facing up, towards top of the piston.
NOTE: Piston rings are installed in the following order:
โข Oil ring expander.
โข Lower oil ring side rail.
โข Upper oil ring side rail.
โข No. 2 Intermediate piston ring.
โข No. 1 Upper piston ring.
1. Install the oil ring expander.
2. Install upper side rail by placing one end between Install upper side rail by placing one end between
the piston ring groove and the expander ring. Hold end firmly and press down the portion to be installed until
side rail is in position. Repeat this step for the lower side rail.
3. Install No.2 intermediate piston ring using a piston ring installer.
4. Install No.1 upper piston ring using a piston ring installer.
NOTE: Install the piston rings so the gaps positioned as indicated with the piston viewed from the top.
NOTE: Staggering ring gap is important for 011 control.
5. Install the oil expander so the ring gap is located in the (1) position.
6. Install the oil ring rails so the ring gap is located in the (2,4) position.
7. Install the second compression ring so the ring gap is located in the (3) position.
8. Install the top compression so the ring gap is located in the (1) position.
