ENGINE
B1220, B1620, B1820, WSM
1-S50
(EU)
Clearance between Piston Ring and Piston Ring Groove
1. Clean the rings and the ring grooves, and install each ring in its
groove.
2. Measure the clearance between the ring and the groove with a
feeler gauge.
3. If the clearance exceeds the allowable limit, replace the piston
ring.
4. If the clearance still exceeds the allowable limit after replacing
the ring, replace the piston.
9Y1210272ENS0083US0
(4) Crankshaft
Crankshaft Side Clearance
1. Set a dial indicator with its tip on the end of the crankshaft.
2. Measure the side clearance by moving the crankshaft to the
front and rear.
3. If the measurement exceeds the allowable limit, replace the
thrust bearings.
4. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an oversize one referring to the
table and figure.
(Reference)
• Oversize thrust bearing
9Y1210272ENS0084US0
Piston ring gap
Second
ring
Factory
specifica-
tion
0.0900 to 0.120 mm
0.00355 to 0.00472 in.
Allowable
limit
0.15 mm
0.0059 in.
Oil ring
Factory
specifica-
tion
0.040 to 0.080 mm
0.0016 to 0.0031 in.
Allowable
limit
0.15 mm
0.0059 in.
Crankshaft side
clearance
Factory specification
0.15 to 0.31 mm
0.0059 to 0.012 in.
Allowable limit
0.50 mm
0.020 in.
Oversize
Bearing
Code Number
Marking
0.20 mm
0.0079 in.
Thrust bearing 1 02
15261-23950
020 OS
Thrust bearing 2 02
15261-23970
020 OS
0.40 mm
0.016 in.
Thrust bearing 1 04
15261-23960
040 OS
Thrust bearing 2 04
15261-23980
040 OS
Oversize
0.20 mm
0.0079 in.
0.40 mm
0.0016 in.
Dimension
A
54.50 to 54.70 mm
2.146 to 2.153 in.
54.60 to 54.80 mm
2.150 to 2.157 in.
Dimension
B
26.20 to 26.25 mm
1.032 to 1.033 in.
26.40 to 26.45 mm
1.040 to 1.041 in.
Dimension
C
2.80 to 3.20 mm radius
0.111 to 0.125 in. radius
2.80 to 3.20 mm radius
0.111 to 0.125 in. radius
The crankshaft journal must be fine-finished to higher than Rmax=0.8S
KiSC issued 07, 2011 A
Summary of Contents for B1220
Page 1: ...WORKSHOP MANUAL TRACTOR B1220 B1620 B1820 KiSC issued 07 2011 A ...
Page 3: ...I INFORMATION KiSC issued 07 2011 A ...
Page 9: ...INFORMATION B1220 B1620 B1820 WSM I 5 EU 9Y1210272INI0002US0 KiSC issued 07 2011 A ...
Page 13: ...G GENERAL KiSC issued 07 2011 A ...
Page 68: ...1 ENGINE KiSC issued 07 2011 A ...
Page 126: ...2 CLUTCH KiSC issued 07 2011 A ...
Page 127: ...CONTENTS 1 LINKAGE MECHANISM 2 M1 MECHANISM KiSC issued 07 2011 A ...
Page 141: ...3 TRANSMISSION KiSC issued 07 2011 A ...
Page 177: ...4 REAR AXLE KiSC issued 07 2011 A ...
Page 178: ...CONTENTS 1 STRUCTURE 4 M1 MECHANISM KiSC issued 07 2011 A ...
Page 186: ...5 BRAKES KiSC issued 07 2011 A ...
Page 203: ...6 FRONT AXLE KiSC issued 07 2011 A ...
Page 204: ...CONTENTS 1 STRUCTURE 6 M1 MECHANISM KiSC issued 07 2011 A ...
Page 218: ...7 STEERING KiSC issued 07 2011 A ...
Page 244: ...8 HYDRAULIC SYSTEM KiSC issued 07 2011 A ...
Page 274: ...9 ELECTRICAL SYSTEM KiSC issued 07 2011 A ...
Page 277: ...ELECTRICAL SYSTEM B1220 B1620 B1820 WSM 9 M2 EU 2 B1220 WITH OPC TYPE KiSC issued 07 2011 A ...