Yamaha MBK MW125 2014, Service Manual

Page: 260 / 380

OIL PUMP
5-57
EAS30340
CHECKING THE OIL STRAINER
1. Check:
• Oil strainer
Damage
→
Replace.
Contaminants
→
Clean with solvent.
EAS30337
CHECKING THE OIL PUMP
1. Check:
• Oil pump driven gear
• Oil pump housing
• Oil pump housing cover
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.
3. Check:
• Oil pump operation
Rough movement
→
Repeat steps (1) and
(2) or replace the defective part(s).
EAS30342
ASSEMBLING THE OIL PUMP
1. Lubricate:
• Inner rotor
• Outer rotor
• Oil pump shaft
2. Install:
• Oil pump driven gear
• Oil pump housing “1”
• Oil pump outer rotor “2”
• Oil pump inner rotor “3”
• Pin “4”
• Oil pump housing cover
TIP
When installing the inner rotor, align the pin “4”
in the oil pump driven gear with the groove “a” in
the inner rotor.
3. Check:
• Oil pump operation
Refer to “CHECKING THE OIL PUMP” on
page 5-57.
1. Inner rotor
2. Outer rotor
3. Oil pump housing
Inner-rotor-to-outer-rotor-tip
clearance
0.150 mm (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)
Recommended lubricant
Engine oil
a
4
3
2
1