Removing The Crankshaft Journal Bearings; Checking The Crankshaft And Connecting Rod - Yamaha MBK X-MAX 300 2017 Service Manual

EAS30419
REMOVING THE CRANKSHAFT JOURNAL
BEARINGS
The following procedure applies to both of the
crankshaft journal bearings.
1. Remove:
• Crankshaft assembly
• Balancer shaft assembly
• Crankshaft journal bearings "1"
TIP
Remove the crankshaft journal bearings using
the pressure tool "2".
Crankshaft metal installation
base set
90890-04181
Crankshaft metal installation
base set
YM-04181
TIP
Identify the position of each crankshaft journal
bearing so that it can be reinstalled in its original
place.
EAS30423
CHECKING THE CRANKSHAFT AND
CONNECTING ROD
1. Measure:
• Crankshaft runout
Out of specification → Replace the crank-
shaft.
Runout limit
0.030 mm (0.0012 in)
2
1
2. Check:
• Crankshaft journal surfaces
• Crankshaft pin surfaces
• Bearing surfaces
Scratches/wear → Replace the crankshaft.
3. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification → Replace the big end
bearings.
Connecting rod
Oil clearance
0.033–0.057 mm (0.0013–0.0022
in)
a. Clean the big end bearings, crankshaft
pins, and the inside of the connecting rod
halves.
b. Install the big end upper bearing into the
connecting rod and the big end lower
bearing into the connecting rod cap.
TIP
Align the projections "a" on the big end bearings
with the notches "b" in the connecting rod and
connecting rod cap.
c. Put a piece of Plastigauge® "1" on the
crankshaft pin.
5-67
CRANKSHAFT