Removing The Oil Pump; Checking The Oil Pump; Assembling The Oil Pump - Yamaha SR400 2014 Service Manual

EAS24940

REMOVING THE OIL PUMP

1. Drain:
• Engine oil
(completely from the crankcase and oil tank)
Refer to "CHANGING THE ENGINE OIL" on
page 3-22.
2. Remove:
• Clutch assembly
Refer to "CLUTCH" on page 5-28.
3. Remove:
• Oil pump drive gear "1"
• Oil pump driven gear "2"
• Oil pump assembly "3"
• Gasket "4"
4
3
2
EAS24960

CHECKING THE OIL PUMP

1. Check:
• Oil pump drive gear
• Oil pump driven gear
• Oil pump housing
• Oil pump cover
Cracks/damage/wear  Replace.
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance "a"
• Outer-rotor-to-oil-pump-housing
"b"
• Oil-pump-housing-to-inner-rotor-and-out-
er-rotor clearance "c"
Out of specification  Replace the oil pump.
1
clearance
5-41
Inner-rotor-to-outer-rotor-tip
clearance
0.070–0.120 mm (0.0028–0.0047
in)
Limit
0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-housing
clearance
0.09–0.15 mm (0.0035–0.0059 in)
Limit
0.22 mm (0.0087 in)
Oil-pump-housing-to-in-
ner-and-outer-rotor clearance
0.03–0.08 mm (0.0012–0.0032 in)
Limit
0.15 mm (0.0059 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
(with the recommended lubricant)
OIL PUMP