BRP Johnson J30TEL4SUA 2007 Service Manual page 164

POWERHEAD
PISTON, CYLINDER, AND CRANKSHAFT
Remove eight (8) outer bolts, then eight (8) inner
bolts. Remove the crankcase from the cylinder
block.
1
2
1. Outer bolts (8)
2. Inner bolts (8)
Use the scale on the Plastigage envelop to mea-
sure the Plastigage on the journal at its widest
point.
If the measurement exceeds the service limit,
replace the crankshaft main bearing.
Crankshaft Journal Oil Clearance
Standard
Service Limit
1
2
1. Scale
2. Plastigage
162
0.0008 to 0.0016 in.
(0.020 to 0.040 mm)
0.0026 in. (0.065 mm)
Selecting a Main Bearing
Whenever a main bearing requires replacement,
select a new bearing according to following proce-
dure.
•
Check the main bearing journal diameter.
The upper (flywheel side) crank web of the No.1
cylinder has four (4) stamped numerals. The
numerals 1, 2, and 3 represent the following jour-
nal diameters.
Numeral
Stamped
1
001532
2
3
5
1. No. 1 journal code
2. No. 2 journal code
3. No. 3 journal code
4. No. 4 journal code
5. Crankshaft (flywheel side)
001575
•
Check the inside diameter of the bearing holder
without the bearing installed.
Main Bearing Journal Diameter
1.5746 to 1.5748 in.
(39.994 to 40.000 mm)
1.5743 to 1.5746 in.
(39.998 to 39.994 mm)
1.5741 to 1.5743 in.
(39.982 to 39.988 mm)
1
2
3
4
001576