Yamaha XMAX YP125R - Service manual > Water pump (YP125R)

Disassembling the water pump

1. Remove:

• Water pump seal "1"

TIP

Remove the water pump seal from the inside of the water pump housing "2".

2. Remove:

• Bearing "1"

TIP

Remove the bearing from the outside of the water pump housing "2".

Checking the water pump

1. Check:

• Water pump housing cover
• Water pump housing
• Impeller shaft

Cracks/damage/wear → Replace.

2. Check:

• Bearing

Rough movement → Replace

Assembling the water pump

1. Install:

• Water pump seal "1"

(into the water pump housing "2")

TIP

Install the water pump seal with the special tools to the specified depth as shown in the illustration.

Installed depth of water pump seal 0-0.5 mm (0-0.02 in)

Mechanical seal installer 90890-04145

Middle driven shaft bearing driver 90890-04058

Bearing driver 40 mm YM-04058

A. Push down

3. Mechanical seal installer

4. Middle driven shaft bearing driver

a. Installed depth of water pump seal

2. Lubricate:

• Water pump seal

Recommended lubricant Lithium-soap-based grease

3. Install:

• Impeller shaft
• Water pump housing plate gasket "1"
• Water pump housing plate 2 "2"
• Water pump housing plate 1 "3"

Water pump housing plate 1 bolt 10 Nm (1.0 m*kgf, 7.2 ft*lbf) LOCTITE

TIP

• After installation, check that the impeller shaft rotates smoothly.
• Be sure to align the bolt holes in the water pump housing plate gasket and water pump housing plates. Make sure that the gasket does not block the holes "a" in the water pump housing plates.

Installing the water pump

1. Install:

• O-rings
• Water pump assembly "1"

Water pump assembly bolt 10 Nm (1.0 m*kgf, 7.2 ft*lbf)

TIP

• Lubricate the O-rings with a thin coat of lithiumsoap- based grease.
• Align the projection "a" on the impeller shaft with the slot "b" in the camshaft sprocket bolt.

2. Fill:

• Cooling system (with the specified amount of the recommended coolant)

3. Check:

• Cooling system

Leaks → Repair or replace any faulty part.

See also: