Checking The Piston Pin; Installing The Piston - Yamaha 2004 Rhino 660 YXR660FAS Service Manual

CYLINDER AND PISTON

CHECKING THE PISTON PIN

1. Check:
• piston pin
Blue discoloration/grooves → Replace, then
check the lubrication system.
2. Measure:
• piston pin-to-piston clearance
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a. Measure the piston pin outside diameter a.
If out of specification, replace the piston pin.
Piston pin outside diameter
21.991 ~ 22.000 mm
(0.8658 ~ 0.8661 in)
<Limit>: 21.971 mm (0.8650 in)
b. Measure the piston pin bore inside diameter
b.
Piston pin bore inside diameter
22.004 ~ 22.015 mm
(0.8663 ~ 0.8667 in)
<Limit>: 22.045 mm (0.8679 in)
c. Calculate the piston pin-to-piston clearance
with the following formula.
Piston pin-to-piston clearance =
Piston pin bore inside diameter b –
Piston pin outside diameter a
d. If out of specification, replace the piston.
Piston pin-to-piston clearance
0.004 ~ 0.024 mm
(0.00016 ~ 0.00094 in)
<Limit>: 0.074 mm (0.00291 in)
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INSTALLING THE PISTON

1. Install:
• piston rings
(onto the piston)
NOTE:
• Be sure to install the piston rings so that the
manufacturer's
located on the upper side of the rings.
• Lubricate the piston and piston rings liberally
with engine oil.
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ENG
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marks or numbers
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are