Checking The Crankcase; Checking The Piston Pin - Yamaha EF2200iS Service Manual

PISTON, CONNECTING ROD, CRANKSHAFT AND CRANKCASE
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P
c. Measure piston skirt diameter "P" with the
micrometer.
a = 10 mm (0.3937 in) from the piston bottom
edge
Piston diameter:
48.574–48.594 mm (1.9124–1.9131 in)
Limit:
48.53 mm (1.9106 in)
d. If out of specification, replace the piston and pis-
ton rings as a set.
e. Calculate the piston-to-cylinder clearance with
the following formula.
Piston-to-cylinder clearance = Cylinder bore "C" – Piston skirt
diameter "P"
Piston-to-cylinder clearance:
0.020–0.035 mm (0.0008–0.0014 in)
Limit:
0.150 mm (0.0059 in)
f. If out of specification, replace the crankcase
assembly, and replace the piston and piston rings
as a set.

CHECKING THE CRANKCASE

1.
Check:
• Crankcase
Damage  Replace.
• Bearing
Noise/wear/rotational failure  Replace.

CHECKING THE PISTON PIN

1.
Check:
• Piston pin
Blue discoloration/grooves  Replace the piston
pin and then check the lubrication system.
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