Removing The Balancer Shaft Journal Bearings; Removing The Crankshaft Journal Bearings; Checking The Balancer Shaft Assembly - Yamaha XSR MTM690 2016 Service Manual

EAS31072
REMOVING THE BALANCER SHAFT
JOURNAL BEARINGS
1. Remove:
• Balancer shaft journal lower bearings
(from the crankcase)
• Balancer shaft journal upper bearings
(from the cylinder)
TIP
Identify the position of each balancer shaft jour-
nal bearing so that it can be reinstalled in its orig-
inal place.
EAS31074
REMOVING THE CRANKSHAFT JOURNAL
BEARINGS
1. Remove:
• Crankshaft journal lower bearings
(from the crankcase)
• Crankshaft journal upper bearings
(from the cylinder)
TIP
Identify the position of each crankshaft journal
bearing so that it can be reinstalled in its original
place.
EAS31142
CHECKING THE BALANCER SHAFT
ASSEMBLY
1. Check:
• Balancer driven gear
Damage/wear → Replace the balancer drive
gear and balancer shaft assembly as a set.
Excessive noise during operation → Replace
the balancer drive gear and balancer shaft
assembly as a set.
2. Measure:
• Balancer shaft runout
Out of specification → Replace the balancer
shaft assembly.
Balancer shaft runout limit
0.030 mm (0.0012 in)
CRANKSHAFT AND BALANCER SHAFT
3. Check:
• Balancer shaft assembly
Cracks/damage/wear → Replace the balanc-
er shaft assembly and journal bearings.
Dirt → Clean.
• Bearings
Damage/wear → Replace.
4. Measure:
• Balancer shaft-journal-to-balancer shaft-jour-
nal-bearing clearance
Out of specification → Replace the balancer
shaft journal bearings.
ECA18400
NOTICE
Do not interchange the balancer shaft jour-
nal bearings. To obtain the correct balancer
shaft-journal-to-balancer shaft-journal-bear-
ing clearance and prevent engine damage,
the balancer shaft journal bearings must be
installed in their original positions.
▼ ▼▼▼
a. Clean the balancer shaft journal bearings,
balancer shaft journals, and bearing portions
of the crankcase and cylinder.
b. Install the balancer shaft journal upper bear-
ings "1" and the balancer shaft assembly into
the cylinder.
TIP
Align the projections "a" on the balancer shaft
journal upper bearings with the notches "b" in the
cylinder.
c. Put a piece of Plastigauge® "2" on each bal-
ancer shaft journal.
5-83
Balancer shaft journal to balanc-
er shaft bearing clearance
0.020–0.054 mm (0.0008–0.0021
in)
Balancer shaft journal to balanc-
er shaft bearing clearance
0.020–0.054 mm (0.0008–0.0021
in)
▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
a
1
▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
b