Checking The Sprocket And Chain; Checking The Oil Pump; Checking The Relief Valve; Assembling The Oil Pump - Yamaha MT-09 2021 Service Manual

EAS30336

CHECKING THE SPROCKET AND CHAIN

1. Check:
• Oil pump drive sprocket
Refer to "CHECKING THE CLUTCH HOUS-
ING" on page 5-51.
2. Check:
• Oil pump drive chain
Damage/stiffness → Replace the oil pump
drive chain and oil pump drive sprocket
(clutch housing) as a set.
EAS30337

CHECKING THE OIL PUMP

1. Check:
• Oil pump driven sprocket
Cracks/damage/wear → Replace the oil
pump drive chain and oil pump driven sprock-
et as a set.
• Oil pump housing
• Oil pump cover
• Oil pump shaft
• Oil pump inner rotor
• Oil pump outer rotor
Cracks/damage/wear → Replace the oil
pump assembly.
2. Check:
• Oil pump operation
Rough movement → Replace the oil pump
assembly.
G088997
EAS30338

CHECKING THE RELIEF VALVE

1. Check:
• Relief valve "1"
• Spring "2"
Damage/wear → Replace the oil pump as-
sembly.
1
EAS30342

ASSEMBLING THE OIL PUMP

1. Lubricate:
• Inner rotor
• Outer rotor
• Oil pump shaft
Recommended lubricant
Engine oil
2. Install:
• Outer rotor "1"
• Inner rotor "2"
• Pin "3"
• Oil pump cover "4"
• Oil pump cover screw
Oil pump cover screw
3.8 N·m (0.38 kgf·m, 2.8 lb·ft)
TIP
Align the pin "3" in the oil pump shaft with the
groove in the inner rotor "2".
4
5-59
OIL PUMP
2
3
2
1