Checking The Oil Strainer; Checking The Oil Pump; Assembling The Oil Pump - Yamaha MBK MW125 2014 Service Manual

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.
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)
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
Recommended lubricant
Engine oil
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.
4
a
3. Check:
• Oil pump operation
Refer to "CHECKING THE OIL PUMP" on
page 5-57.
5-57
OIL PUMP
3
2
1