Removing The Crankshaft Assembly; Checking The Crankshaft - Yamaha VMX12 2001 Service Manual

CRANKSHAFT
EAS00387
REMOVING THE CRANKSHAFT
ASSEMBLY
1. Remove:
• crankshaft assembly
• crankshaft journal upper bearings
(from the upper crankcase)
NOTE:
@
Identify the position of each crankshaft journal
upper bearing so that it can be reinstalled in its
original place.
@
EAS00396

CHECKING THE CRANKSHAFT

1. Measure:
• crankshaft runout
Out of specification → Replace the crank-
shaft.
Crankshaft runout
Less than 0.03 mm
2. Check:
• crankshaft journal surfaces
• crankshaft pin surfaces
• bearing surfaces
Scratches/wear → Replace the crankshaft.
3. Measure:
• crankshaft-journal-to-crankshaft-journal-
bearing clearance
Out of specification → Replace the crank-
shaft journal bearings.
Crankshaft-journal-to-crankshaft-
journal-bearing clearance
0.040 ~ 0.058 mm
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
CAUTION:
@
Do not interchange the crankshaft journal
bearings. To obtain the correct crankshaft-
journal-to-crankshaft-journal-bearing clear-
ance and prevent engine damage, the
crankshaft
installed in their original positions.
@
4 - 68
ENG
journal bearings must be