47
LYC062
LYC023
4. Main and conrod bearing shells are color-coded for
thickness as follows: orange (thinnest), blue
(medium), and green (thickest). For the conrod, only
orange and green are used.
5. Use the following tables to determine the crankshaft
grade code and then chose the proper conrod bearing
(journal sizes also shown for reference):
NOTE: Bearing size is based on a crankcase housing
bore and conrod big end bore that are not worn. This
pre-selection results in the following bearing play:
NOTE: Bearing clearance may be confirmed using
an indicator strip such as PLASTIGAUGE
®
.
PISTON
1. Check proper seat of circlip.
Disassembly
1. Using an awl, remove one piston-pin circlip.
2. Remove the piston pin. Mark pin as to MAG/PTO
direction. Account for the opposite-side circlip.
Remove the piston from connecting rod.
NOTE: If hard to remove the piston, use a Piston
Pin Puller. It is advisable to remove the opposite-side
circlip prior to using the puller.
3. Starting with the top piston ring, slide one end of the
ring out of the ring-groove.
4. Remove each ring by working it toward the dome of
the piston while rotating it out of the groove.
LYC024
PISTON PIN
1. Inspect pin and circlip for wear and discoloration.
2. Measure piston pin. Piston pin size must be within
specified dimensions.
3. Replace pin if the diameter is smaller then specified
dimensions and/or when radial valleys can be felt.
NOTE: Mild discoloration/bluing is not a concern
when pin is not seized.
ATV-1070
CRANKSHAFT BEARING
Grade
Diameter
(GL1, GL2, GL3)
Color
A 39.980-39.986 mm Orange/Orange
B 39.973-39.979 mm Green/Green
C 39.966-39.972 mm Blue/Blue
CONROD BEARING
Grade Diameter (HL1) Color
A 39.980-39.986 mm Orange/Orange
B 39.973-39.979 mm Green/Green
C 39.966-39.972 mm Green/Green
BORE SIZE IN BOLTED CONDITION
Crankshaft Main Bearing at Engine
Housing
44.000 to 44.011 mm
Conrod Big End Bearing
43.000 to 43.011 mm
BEARING PLAY
Crankshaft Main Bearing
0.030 to 0.060 mm
Conrod Big End Bearing
0.025 to 0.050 mm
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