Checking The Oil Pump; Assembling The Oil Pump - Yamaha YZF-R125 Service Manual

YamahaR125.COM
EAS24960

CHECKING THE OIL PUMP

1. Check:
• Oil pump drive gear
• 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"
• Oil-pump-housing-to-inner-rotor-and-outer-
rotor clearance "c"
Out of specification → Replace the oil pump.
1. Inner rotor
2. Outer rotor
3. Oil pump housing
Inner-rotor-to-outer-rotor-tip
clearance
Less than 0.15 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)
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)
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:
• Oil pump inner rotor
• Oil pump outer rotor
• Oil pump driven gear
(with the recommended lubricant)
Recommended lubricant
Engine oil
2. Install:
• Oil pump outer rotor
• Oil pump inner rotor "1"
• Oil pump driven gear
• Pin "2"
NOTE:
When installing the inner rotor, align the pin "2"
in the oil pump shaft with the groove "a" in the in-
ner rotor "1".
5-49
OIL PUMP