Cylinder And Piston Inspection - Yamaha WaveRunner FX160 Wartungshandbuch

POWR
a
b
D
2
c
D
4
D
6
CONNECTING RODS AND PISTONS
D
1
d
D
3
e
D
5

Cylinder and piston inspection

The following procedure applies to all of the
cylinders and pistons.
1. Check:
• Piston wall
• Cylinder wall
Vertical scratches → Replace the cylin-
der, and the piston and piston rings as a
set.
2. Measure:
• Piston-to-cylinder clearance
Measurement steps:
• Measure cylinder bore "C" with the cylin-
der bore gauge.
Cylinder bore "C"
Taper limit "T"
Out of round "R"
"C" = maximum of D
"T" = maximum of D
(direction e)
and D –D
2 6
"R" = maximum of D
point a) and D
• If out of specification, replace the cylin-
der, and the piston and piston rings as a
set.
• Measure piston skirt diameter "P" with the
micrometer.
a 5 mm (0.2 in) from the bottom edge of the
piston
Standard
5-93
76.000–76.015 mm
(2.9921–2.9927 in)
0.08 mm (0.003 in)
0.05 mm (0.002 in)
–D
1 6
(direction d)
–D
1 5
–D (measuring
2 1
(measuring point c)
–D
6 5
Piston size "P"
75.895–75.910 mm
(2.9880–2.9986 in)
E