ENGINE
B2050, B2350, B2650, B3150, WSM
1-S51
Oil Clearance of Camshaft Journal
1. Measure the camshaft journal O.D. with an outside micrometer.
2. Measure the cylinder block bore I.D. for camshaft with a cylinder
gauge, and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the
camshaft.
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Replacing Idle Gear Bushing
(When removing)
1. Press out the used idle gear bushing using an idle gear bushing
replacing tool. (See page "SPECIAL TOOLS".)
(When installing)
1. Clean a new idle gear bushing and idle gear bore, and apply
engine oil to them.
2. Press in a new bushing using an idle gear bushing replacing
tool, until it is flush with the end of the idle gear.
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(3) Piston and Connecting Rod
Piston Pin Bore I.D.
1. Measure the piston pin bore I.D. in both the horizontal and
vertical directions with a cylinder gauge.
2. If the measurement exceeds the allowable limit, replace the
piston.
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Oil clearance of
camshaft journal
Factory specification
0.050 to 0.091 mm
0.0020 to 0.0035 in.
Allowable limit
0.15 mm
0.0059 in.
Camshaft journal O.D. Factory specification
35.934 to 35.950 mm
1.4147 to 1.4153 in.
Camshaft bearing I.D.
(Cylinder block bore I.D.)
Factory specification
36.000 to 36.025 mm
1.4173 to 1.4183 in.
(A) When Removing (B) When Installing
Piston pin bore I.D.
Factory specification
22.000 to 22.013 mm
0.86615 to 0.86665 in.
Allowable limit
22.03 mm
0.8673 in.
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