Yamaha XMAX YP125R - Service manual > Oil pump (YP250R)

Removing the oil pump

Removing the oil pump

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 defective 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-outerrotor 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 0.013-0.036 mm (0.0005-0.0014 in)

Limit 0.106 mm (0.0042 in)

Oil-pump-housing-to-inner-andouter- rotor clearance 0.04-0.09 mm (0.0016-0.0035 in) Limit 0.16 mm (0.0063 in)

3. Check:

• Oil pump operation

Rough movement → Repeat steps (1) and (2) or replace the defective part(s).

Assembling the oil pump

1. Lubricate:

• Inner rotor
• Outer rotor

Recommended lubricant Engine oil

2. Lubricate:

• Oil pump shaft (with the recommended lubricant)

Recommended lubricant Molybdenum disulfide grease

3. Install:

• Oil pump shaft "1"
• Pin "2"

TIP

When installing the oil pump shaft, align the pin in the oil pump shaft with the groove "a" in the inner rotor.

4. Check:

• Oil pump operation

Installing the oil pump

1. Install:

• Oil pump assembly

Oil pump assembly bolt 7 Nm (0.7 m*kgf, 5.1 ft*lbf)

NOTICE

After tightening the bolts, make sure the oil pump turns smoothly.

See also: