BRP Johnson J30TEL4SUA 2007 Service Manual page 162

POWERHEAD
PISTON, CYLINDER, AND CRANKSHAFT
Crankshaft Thrust Bearing Flange Thickness
Standard
1. Crankshaft thrust bearing flange
Inspect the crankshaft journals for wear and dam-
age.
Use a micrometer to measure the crankshaft jour-
nal for out-of-round and taper.
If any crankshaft journal is worn or damaged, or
the out-of-round or taper exceeds the service limit,
replace the crankshaft.
Crankshaft Journal Specifications
Standard Diameter
Out-of-Round and
Taper Service Limit
2
4
1. Crankshaft journal
2. Micrometer
3. Taper measurement
4. Out-of-round measurement
160
0.0972 to 0.0992 in.
(2.470 to 2.520 mm)
001567
1.5741 to 1.5748 in.
(39.982 to 40.000 mm)
0.0004 in. (0.010 mm)
001568
Crankshaft Main Bearings
Inspect the crankshaft bearing shells for pitting,
scratches, and wear. Replace any damaged bear-
ings.
IMPORTANT:
shell. Both halves of the bearing must be replaced
if either is worn or damaged.
1
Clean the surface of the bearing holders, the
bearings, and the main bearing journals.
Install the bearing shells into their original loca-
tions.
Install the main bearings in the cylinder and the
crankcase.
1
1
3
1. Upper bearing shells
2. Lower bearing shells
NEVER replace only one bearing
001569
2
001570