Checking The Oil Pump; Assembling The Oil Pump - Yamaha YFM70RY Service Manual

EAS24960

CHECKING THE OIL PUMP

1. Check:
• Oil pump driven gear "1"
• Oil pump housing 1 "2"
• Oil pump housing cover "3"
• Oil pump housing 2 "4"
Cracks/damage/wear → Replace the defec-
tive part(s).
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance "a"
• Outer-rotor-to-oil-pump-housing clearance
"b"
Out of specification → Replace the oil pump.
Inner-rotor-to-outer-rotor-tip
clearance
0.12 mm (0.0047 in)
Limit
0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-housing
clearance
0.090–0.150 mm (0.0035–0.0059
in)
Limit
0.22 mm (0.0087 in)
1. Inner rotor
2. Outer rotor
3. Oil pump housing
3. Check:
• Oil pump operation
Rough movement → Repeat steps (1) and
(2) or replace the defective part(s).
EAS25000

ASSEMBLING THE OIL PUMP

1. Lubricate:
• Inner rotor
• Outer rotor
• Oil pump shaft
(with the recommended lubricant)
Recommended lubricant
Engine oil
2. Install:
• Oil pump outer rotor 2 "1"
• Oil pump inner rotor 2 "2"
(to the oil pump housing 2)
• Oil pump housing
Oil pump housing screw
7 Nm (0.7 m·kg, 5.1 ft·lb)
TIP
Align the match mark "a" on the inner rotor 2 with
the match mark "b" on the outer rotor 2.
3. Check:
• Oil pump operation
Refer to "CHECKING THE OIL PUMP" on
page 5-52.
5-52
OIL PUMP