Yamaha YZ 2018 Series, Owner'S Service Manual, Page: 253 / 402

OIL PUMP AND BALANCER GEAR
5-56
3. Check:
• Oil pump operation
Rough movement

Repeat steps (1) and
(2) or replace the defective part(s).
EASB29B269
ASSEMBLING THE OIL PUMP
1. Install:
• Oil pump drive shaft “1”
• Inner rotor “2”
• Dowel pin “3”
TIP
• Apply the engine oil on the oil pump drive
shaft and inner rotor.
• Fit the dowel pin into the groove in the inner
rotor.
2. Install:
• Outer rotor “1”
TIP
Apply the engine oil on the outer rotor.
3. Install:
• Oil pump cover “1”
• Oil pump cover screw “2”
Inner-rotor-to-outer-rotor-tip
clearance
0.000–0.150 mm (0.0000–0.0059
in)
Limit
0.23 mm (0.0091 in)
Outer-rotor-to-oil-pump-housing
clearance
0.13–0.18 mm (0.0051–0.0071 in)
Limit
0.25 mm (0.0098 in)
Oil-pump-housing-to-inner-and-
outer-rotor clearance
0.06–0.11 mm (0.0024–0.0043 in)
Limit
0.18 mm (0.0071 in)
1. Inner rotor
2. Outer rotor
3. Oil pump housing
b
a
1
2
3
c
Oil pump cover screw
2.0 N·m (0.20 kgf·m, 1.5 lb·ft)
2
1
3
1
E
T
R
.
.
2
1