Checking The Balancer Shaft - Yamaha YZF-R1 Series Service Manual

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
Scratches/wear → Replace the balancer
shaft.
• Bearing surfaces
Scratches/wear → Replace the balancer
shaft journal bearing.
3. Measure:
• Balancer shaft journal-to-balancer shaft jour-
nal bearing clearance
Out of specification → Replace the balancer
shaft journal bearings.
Balancer shaft journal to balanc-
er shaft bearing clearance
0.028–0.046 mm (0.0011–0.0018
in)
ECA18400
NOTICE
Do not interchange the balancer shaft jour-
nal bearings. To obtain the correct balancer
shaft-journal-to-balancer shaft-journal-bear-
CRANKSHAFT AND BALANCER SHAFT
ing clearance and prevent engine damage,
the balancer shaft journal bearings must be
installed in their original positions.
J J J J J
1 2 3 4 5
TIP
Align the projections "a" on the balancer shaft
journal upper bearings with the notches "b" in the
upper crankcase.
G089019
TIP
Do not put the Plastigauge® over the oil hole in
the balancer shaft journal.
G089020
TIP
• Align the projections "a" of the balancer shaft
journal lower bearings with the notches "b" in
the crankcase.
• Do not move the balancer shaft until the clear-
ance measurement has been completed.
5-94
a. Clean the balancer shaft journal bearings,
balancer shaft journals, and bearing por-
tions of the crankcase.
b. Place the upper crankcase upside down
on a bench.
c. Install the balancer shaft journal upper
bearings "1" and the balancer shaft into
the upper crankcase.
d. Put a piece of Plastigauge® "1" on each
balancer shaft journal.
e. Install the balancer shaft journal lower
bearings "1" into the lower crankcase and
assemble the crankcase halves.
1
a
b
1