Komatsu PC88MR-10 Shop Manual page 1087

Perform subsequent installation in the reverse
order of removal.
[*1]
Coupling mounting bolt:
98 to 122.6 Nm {10 to 12.5 kgm}
[*2]
Tighten the flywheel mounting bolts according to
the following procedure.
1. Apply engine oil to the threaded portions of
mounting bolts.
Mounting bolt threads:
Engine oil
2. Tighten the mounting bolts twice in order
according to the following torque.
Mounting bolt:
1st time: 58.8 to 117.7 Nm {6.0 to
12.0 kgm}
2nd time: 186.3 to 196.1 Nm {19.0
to 20.0 kgm}
The following figure shows the tightening order.
Measurement of radial runout of flywheel
a Standard value: Max. 0.30 mm
1. Install dial gauge [1] to the flywheel housing.
2. Set the probe of the dial gauge at a right
angle to the spigot joint portion (a) or outside
of the flywheel.
PC88MR-10
50 Disassembly and assembly
Engine and cooling system
3. Rotate the flywheel 1 turn, and measure the
difference between the maximum and
minimum readings of the dial gauge pointer.
a When the flywheel rotated 1 turn, check
that the dial gauge indicates the same
value as it of the starting rotation.
Measurement of facial runout of flywheel
a Standard value: Max. 0.30 mm
1. Similarly to the measurement of radial runout,
set dial gauge [2] so that its probe is at a right
angle with the end face (b) near the outer
circumference of the flywheel.
a Perform the measurement with the
crankshaft pulled to either the front or
rear side of the engine to prevent errors
caused by backlash.
2. Rotate the flywheel one turn, and measure
the difference between the maximum and
minimum readings of the dial gauge pointer.
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