Assembling The Piston And Cylinder Block - Yamaha F2.5A Service Manual

POWR
Assembling the piston and cylinder
block
1. Assemble the piston 1, connecting rod
2, piston pin 3, and new piston pin clips
4.
NOTE:
• Face the embossed "Y" mark a on the
connecting rod in the same direction as the
"UP" mark b on the piston.
• Always use new piston pin clips, and do not
allow the piston pin clip end to align with the
piston pin slot c.
2. Install the oil ring 5, second ring 6, and
top ring 7 to the piston with the "N"
marks d of the top and second ring fac-
ing upward.
3. Offset the piston ring end gaps as
shown.
5
#5
#4
#3
E
5-33
Power unit
d
45˚
45˚
#3
UP
#1,#4
6
#2
7
#1
d
N
S69M5940
CAUTION:
Do not scratch the piston or break the pis-
ton rings.
NOTE:
After installing the piston rings, check them
for smooth operation.
4. Install the crankshaft 8 into the cylinder
block 9.
8
5. Install the piston with the "UP" mark on
the piston crown facing towards the fly-
wheel magnet.
NOTE:
#2
Apply engine oil to the piston and piston rings
before installation.
#5
Piston slider 0: 90890-06843
9
S69M5950
0
S69M5970
69M3E11