POWER UNIT 6-58
1st ring and 2nd ring
• Apply engine oil to piston ring.
• Install 2nd ring and 1st ring to piston.
NOTE:
• 1st ring differs from 2nd ring in shape and color of surface
contacting cylinder wall.
Distinguish 1st ring from 2nd ring by referring to figure.
• As indicated in figure, 1st and 2nd ring are marked, “N” or
“2N” .
When installing these piston rings, the marked side of each
ring must face towards top of piston.
Ring gap direction
Position rings so that their gaps are staggered at approxi-
mately 90 degree angles as shown.
1 1st ring 3 2nd ring
2 Oil ring lower side rail 4 Oil ring upper side rail
B
Failure to stagger piston ring gaps may result in crank-
case oil dilution.
1. 1st ring
2. 2nd ring
3. Oil ring
Mark
“N”
“2N”
1st ring
2nd ring
Up mark “O”
1
2
3
4
2
1
2
Incorrect
Correct
PISTON RING TO PISTON
Oil ring
• Apply engine oil to piston rings.
• Install spacer 1 first, then side rails 2 to piston.
B
When installing spacer, do not allow ends to overlap in
groove.
1
2
3
2nd ring
1st ring
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