The upper crankcase half and lower crankcase half are machined at the factory in the assembled state, so they must be replaced as a set

NOTE

Crankshaft Main Journal Diameter Marks

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.

None: 35.984 ~ 35.992 mm (1.4167 ~ 1.4170 in.)

1: 35.993 ~ 36.000 mm (1.4170 ~ 1.4173 in.)

□: Crankshaft Main Journal Diameter Marks, "1" mark or no mark.

• Put the lower crankcase half on the upper crankcase half without bearing inserts, and tighten the case bolts to the specified torque and sequence (see Crankcase Assem­bly).

• Measure the crankcase main bearing bore diameter, and mark the upper crankcase half in accordance with the bore diameter.

OThe mark already on the upper crankcase half should almost coincide with the measurement.

9-22 CRANKSHAFT/TRANSMISSION

Crankshaft/Connecting Rods Crankcase Main Bearing Bore Diameter Marks ○: 39.000 ∼ 39.008 mm (1.5354 ∼ 1.5357 in.) None: 39.009 ∼ 39.016 mm (1.5358 ∼ 1.5361 in.) □□ □□: Crankcase Main Bearing Bore Diameter Marks, "○" mark or no mark. • Select the proper bearing insert in accordance with the combination of the crankcase and the crankshaft coding. • Install the new inserts in the crankcase halves and check insert/journal clearance with a plastigage.

Crankshaft Main Bearing Insert Selection

Crankcase Main Bearing Bore Diameter Mark	Crankshaft Main Journal Diameter Mark	Bearing Insert*
Size Color	Part Number	Journal Nos
о		Brown	92028-1102	2, 3
92028-1274	1, 4
None	None	Blue	92028-1100	2, 3
92028-1272	1, 4
о	None	Black	92028-1101	2, 3
None		92028-1273	1, 4

*: The bearing inserts for Nos. 2 and 3 journals have oil grooves.

Crankshaft Side Clearance

• Measure the crankshaft side clearance.

OInstall the lower crankcase half on the upper crankcase

half, and turn the crankcase upside down. OInsert a thickness gauge [A] between the upper crankcase

[B] and the crank web [C] at the No.2 and No.3 journals

to determine clearance.

• If the clearance exceeds the service limit, replace the
crankcase halves as set.

CAUTION

Дата добавления: 2014-12-23