Checking The Balancer Shaft - Yamaha TRACER MT09TRA Service Manual

A
J J J
B
1 2 3
EAS31076

CHECKING THE BALANCER SHAFT

1. Measure:
• Balancer shaft runout
Out of specification  Replace the balancer
shaft.
Balancer shaft runout limit
0.030 mm (0.0012 in)
2. Check:
• Balancer shaft journal surfaces
• Bearing surfaces
Scratches/wear  Replace the balancer
shaft.
3. Measure:
• Balancer shaft journal-to-balancer shaft jour-
nal bearing clearance
Out of specification  Replace the balancer
shaft journal bearings.
CRANKSHAFT AND BALANCER SHAFT
J J J J
1 2 3 4
J
4
Balancer shaft journal to balancer
shaft bearing clearance
0.024–0.048 mm (0.0009–0.0019
in)
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.
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a. Clean the balancer shaft journal bearings,
balancer shaft journals, and bearing portions
of the crankcase.
b. Place the upper crankcase upside down on a
bench.
c. Install the balancer shaft journal upper bear-
ings "1" and the balancer shaft into the upper
crankcase.
TIP
Align the projections "a" on the balancer shaft
journal upper bearings with the notches "b" in the
upper crankcase.
1
a
b
d. Put a piece of Plastigauge® "1" on each bal-
ancer shaft journal.
TIP
Do not put the Plastigauge® over the oil hole in
the balancer shaft journal.
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