BRP Johnson J30TEL4SUA 2007 Service Manual page 167

IMPORTANT:
The top compression ring differs
from the second compression ring in shape and
color of the surface contacting the cylinder wall.
1
2
3
1. Top compression ring
2. 2nd compression ring
3. Oil ring
IMPORTANT:
The top compression ring and the
second compression ring are marked "RN" or "R".
When installing these piston rings, the marked
side must face toward the top of the piston.
1
1. ID mark location
2. Top compression ring ("RN")
3. Second compression ring ("R")
IMPORTANT:
Position the piston rings so their
gaps are each staggered by approximately 90°, as
PISTON, CYLINDER, AND CRANKSHAFT
shown. Failure to stagger the piston ring gaps
may result in crankcase oil dilution.
3
2
1. Top compression ring
2. Oil ring lower side rail
001587
3. 2nd compression ring
4. Oil ring upper side rail
Apply engine oil to the piston and the cylinder
walls. Use a piston ring compressor to insert the
piston and connecting rod assembly into the cylin-
der bore from the cylinder head side. Position the
"O" mark on the top of the piston to the flywheel
side.
2
3
001588
1. Piston ring compressor
1. "O" mark (flywheel side of piston)
POWERHEAD
4
1
001589
7
1
001591
1
001592
165