BRP Johnson 4HP, Service Manual, Page: 108 / 185

6-34
POWERHEAD
REASSEMBLY
Piston Ring to Piston
Oil ring
1. Apply engine oil to the piston rings.
2. Install the spacer
1
first, then the side rails
2
to the pis-
ton.
When installing the spacer, do not allow the ends to
overlap in the groove.
1st ring and 2nd ring
1. Apply engine oil to the piston rings.
2. Install the 2nd ring and the 1st ring to the piston with the
“N” mark toward the piston head side.
NOTE:
The 1st ring differs from the 2nd ring in shape.
Distinguish the 1st ring from the 2nd ring by referring to the
figure.
Ring gap direction
Position the piston rings so the ring gaps are staggered at
approximately 90 degree angles as shown in the figure.
1
1st ring
3
2nd ring
2
Oil ring lower side rail
4
Oil ring upper side rail
Failure to stagger the piston ring gaps may result in
crankcase oil dilution.
Incorrect
Correct
Chrome plate
1st ring
2nd ring
Up mark “O”