Assembling The Piston And Connecting Rod Assemblies - Yamaha F15B Service Manual

POWR
6. If the oil clearance is below specification,
check the main bearing color and clean
the contact surface of the cylinder body
and the main bearing, and then check the
main journal oil clearance again.
7. If the oil clearance is over specification,
install an oversized main bearings as a
set, and then check the main journal oil
clearance again.
Assembling the piston and
connecting rod assemblies
1. Assemble the pistons 1, connecting
rods 2, piston pins 3, and new piston
pin clips 4.
4
2
a
4
NOTE:
9 Face the embossed "Y" mark a on the con-
necting rod in the same direction as the
"UP" mark b on the piston.
9 Always use new piston pin clips.
2. Install the oil ring 5, second ring 6, and
top ring 7 to the piston with the "N" mark
c on the piston rings facing upward.
5-45
Power unit
3
1
b
4
6D451400
3. Offset the piston ring end gaps as shown.
cC
Do not scratch the piston or break the pis-
ton rings.
NOTE:
After installing the piston rings, check that
they move smoothly.
4. Install the piston with the "UP" mark on
the piston crown facing towards the fly-
wheel.
NOTE:
Apply engine oil to side of the piston assem-
bly.
Piston slider: 90890-06529
c
6D451410
6D451420
6D45F11