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

Removing the water pump

Removing the water pump

A: Oil pump side

Disassembling the water pump

1. Remove:

• Rubber damper holder "1"
• Rubber damper "2"

(from the impeller, with a thin, flat-head screwdriver)

TIP

Do not scratch the impeller shaft.

2. Remove:

• Water pump seal "1"

TIP

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

3. Remove:

• Bearing "1"
• Oil seal "2"

TIP

Remove the bearing and oil seal from the outside of the water pump housing.

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:

• Oil seal "1" (into the water pump housing)

TIP

• Before installing the oil seal, apply tap water or coolant onto its outer surface.
• Install the oil seal with a socket that matches its outside diameter.

Installed depth of oil seal "a" 8.1-8.7 mm (0.32-0.34 in)

2. Install:

• Water pump seal "1"

TIP

• Install the water pump seal with the special tools.
• Before installing the water pump seal, apply Yamaha bond No.1215 (Three Bond No.1215) "2" to the water pump housing "3".

Mechanical seal installer 90890-04132

Water pump seal installer YM-33221-A

Middle driven shaft bearing driver 90890-04058

Bearing driver 40 mm YM-04058

Yamaha bond No. 1215 90890-85505 (Three Bond No.1215)

A. Push down

4. Mechanical seal installer

5. Middle driven shaft bearing driver

3. Install:

• Rubber damper "1"
• Rubber damper holder "2"

TIP

Before installing the rubber damper, apply tap water or coolant onto its outer surface.

4. Measure:

• Impeller shaft tilt

Out of specification → Repeat steps (3) and (4).

NOTICE

Make sure the rubber damper and rubber damper holder are flush with the impeller.

Impeller shaft tilt limit 0.15 mm (0.0059 in)

1. Straightedge

2. Impeller

5. Install:

• Impeller shaft
• Circlip

TIP

After installation, check that the impeller shaft rotates smoothly.

Installing the water pump

1. Install:

• Impeller shaft gear "1"

TIP

Align the slot on the impeller shaft with the projection on the impeller shaft gear when installing.

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: