Measuring Crankshaft Runout; Replacing Crankshaft Gear; Removing Crankshaft Gear; Installing Crankshaft Gear - Mitsubishi Heavy Industries SL Series Service Manual

4.10 Measuring crankshaft runout

Support the crankshaft at the front and rear journals with V-
blocks, and measure the crankshaft runout at the center
journal using a dial gauge. If the runout deviates from the
standard only slightly, grind the crankshaft to repair. If the
runout exceeds the standard considerably, straighten the
crankshaft using a press.
If the limit is exceeded, replace the crankshaft.
If the crankshaft has been repaired by grinding or pressing,
inspect the crankshaft for cracks and other harmful damage
using a magnetic particle method.
Item
Crankshaft runout (TIR)

4.11 Replacing crankshaft gear

4.11.1 Removing crankshaft gear

Using a gear puller, remove the gear from the crankshaft.
Note: Do not strike the gear with a hammer.

4.11.2 Installing crankshaft gear

(1) Install the key on the crankshaft.
(2) Press-fit the gear fully in alignment with the key.
Standard Limit
0.025 mm 0.050 mm
[0.0010 in.] or less [0.0020 in.]
INSPECTION AND REPAIR OF BASIC ENGINE
Measuring crankshaft runout
Removing crankshaft gear
Align them
Removing crankshaft gear
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