Connecting Rod Big End Bearing Insert Selection

Crankshaft Runout

• Measure the crankshaft runout.

OSet the crankshaft in a flywheel alignment jig or on V blocks.

OSet a dial gauge against the points indicated.

OTurn the crankshaft slowly to measure the runout. The dif­ference between the highest and lowest dial gauge read­ings (TIR) is the amount of runout.

• If the measurement exceeds the service limit, replace the
crankshaft.

Crankshaft Runout Service Limit: 0.05 mm (0.0020 in.) TIR

Crankshaft Main Bearing Insert/Journal Clearance

• Measure the bearing insert/journal clearance using a
plastigage.

OSplit the crankcase and wipe each bearing insert and jour­nal surface clean of oil.

OCut strips of plastigage to bearing insert width, and place a strip on each journal parallel to the crankshaft so that the plastigage will be compressed between the journal and the bearing insert.

CRANKSHAFT/TRANSMISSION 9-21

Crankshaft/Connecting Rods

OInstall the lower crankcase half, and tighten the case bolts to the specified torque.

Torque - Crankcase 8 mm Bolts: 27 N·m (2.8 kgf·m, 20 ft·lb) Crankcase 6 mm Bolts: 12 N·m (1.2 kgf·m, 104 in·lb)

NOTE

O Do not turn the crankshaft during clearance measure­ment.

ORemove the lower crankcase half and measure the plas-tigage width [A] to determine the bearing insert/journal [B] clearance.

Crankshaft Main Bearing Insert/Journal Clearance
Standard: 0.020 ~ 0.044 mm (0.0008 ~ 0.0017 in.)

Service Limit: 0.08 mm (0.0032 in.)

• If the clearance is within the standard, no bearing insert replacement is required.

• If the clearance is between 0.044 mm (0.0017 in.) and the service limit 0.08 mm (0.0032 in.), replace the bearing in­serts [A] with inserts painted blue [B] Check insert/journal clearance with a plastigage. The clearance may exceed the standard slightly, but it must not be less than the min­imum in order to avoid bearing seizure.

• If the clearance exceeds the service limit, measure the diameter of the crankshaft main journal.

Crankshaft Main Journal Diameter
Standard: 35.984- 36.000 mm (1.4167 ~ 1.4173 in.)

Service Limit: 35.96 mm (1.4157 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 on the crankshaft, write a new mark on it.