Kawasaki STX-15F service manual Crankshaft Main Bearing Insert/Journal Wear

8-24 ENGINE BOTTOM END

Crankshaft and Connecting Rods

Crankshaft Main Bearing Insert/Journal Wear

•Measure the bearing insert/journal [B] clearance with a plastigage [A].

NOTE

○Tighten the crankcase bolts to the specified torque (see Crankcase Assembly).

○Do not turn the crankshaft during clearance measure- ment.

○Journal clearance less than 0.025 mm (0.0010 in.) can not be measured by plastigage, however, using genuine parts maintains the minimum standard clearance.

Crankshaft Main Bearing Insert/Journal Clearance

Standard: 0.030 ∼ 0.054 mm (0.0012 ∼ 0.0021 in.)

Service Limit: 0.08 mm (0.0032 in.)

If clearance is within the standard, no bearing replace- ment is required.

If clearance is between 0.055 mm (0.022 in.) and the ser- vice limit (0.08 mm, 0.0032 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 clearance exceeds the service limit, measure the diam- eter of the crankshaft main journal.

Crankshaft Main Journal Diameter

Standard:	40.984 ∼ 41.000 mm (1.6135 ∼ 1.6142 in.)
Service Limit:	40.96 mm (1.613 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, make new marks on it.

Crankshaft Main Journal Diameter Marks
None	40.984 ∼	40.992 mm (1.6135 ∼	1.61385 in.)
1	40.993 ∼	41.000 mm (1.61389 ∼	1.6142 in.)

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