Crankshaft and Connecting Rods
Crankshaft Runout Inspection
Measure the crankshaft runout.
If the measurement exceeds the service limit, replace the
TIR 0.02 mm (0.0008 in.) or less
Service Limit: TIR 0.05 mm (0.0020 in.)
Crankshaft Main Bearing Insert/Journal Wear
Using a plastigage (press gauge) [A], measure the bear-
ing insert/journal [B] clearance.
Tighten the crankcase bolts to the specified torque (see
Do not turn the crankshaft during clearance measure-
Journal clearance less than 0.025 mm (0.00098 in.) can
not be measured by plastigage, however, using genuine
parts maintains the minimum standard clearance.
Crankshaft Main Bearing Insert/Journal Clearance
0.010 ∼ 0.037 mm (0.0004 ∼ 0.0015 in.)
Service Limit: 0.07 mm (0.0028 in.)
If the clearance is within the standard, no bearing replace-
ment is required.
If the clearance is between 0.038 mm (0.0015 in.) and the
service limit (0.07 mm, 0.0028 in.), replace the bearing in-
serts [A] with inserts painted blue [B]. Check insert/journal
clearance with the plastigage. The clearance may exceed
the standard slightly, but it must not be less than the min-
imum in order to avoid bearing seizure.
If the clearance exceeds the service limit, measure the
diameter [C] of the crankshaft main journal.
Crankshaft Main Journal Diameter
30.984 ∼ 31.000 mm (1.2198 ∼ 1.2202 in.)
Service Limit: 30.96 mm (1.2189 in.)
If any journal has worn past the service limit, replace the
crankshaft with a new one.
If the measured journal diameters are not less than the
service limit, but do not coincide with the original diameter
markings [D] on the crankshaft, make new marks on it.
Crankshaft Main Journal Diameter Marks
None: 30.984 ∼ 30.992 mm (1.2198 ∼ 1.2202 in.)
30.993 ∼ 31.000 mm (1.2203 ∼ 1.2205 in.)
: Crankshaft Main Journal Diameter Marks, "1" mark
or no mark.