Yamaha Tracer MT09TRA - Service manual > Water pump

Disassembling the water pump

1. Remove:

• Mechanical seal (housing side) "1"

TIP

Remove the mechanical seal (housing side) from the inside of the water pump housing "2".

2. Remove:

• Bearing "1"
• Oil seal "2"

TIP

Remove the oil seal and bearing from the outside of the water pump housing "3".

3. Remove:

• Mechanical seal (impeller side) "1" (from the impeller, with a thin, flat-head screwdriver)

TIP

Do not scratch the impeller shaft.

Checking the water pump

1. Check:

• Water pump housing cover "1"
• Impeller shaft "2"

Cracks/damage/wear → Replace.

• Water pump housing "3"

Cracks/damage/wear → Replace the water pump assembly.

2. Check:

• Bearing

Rough movement → Replace.

3. Check:

• Water pump inlet hose

Cracks/damage/wear → Replace.

Assembling the water pump

1. Install:

• Oil seal "1"
• Bearing "2"   (into the water pump housing "3")

Installed depth "a" 0.5-1.0 mm (0.02-0.04 in)

TIP

Install the oil seal with a socket that matches its outside diameter.

2. Install:

• Mechanical seal (housing side) "1"

NOTICE

Never lubricate the mechanical seal (hous- ing side) surface with oil or grease.

TIP

Use the special tools and a press to press the mechanical seal (housing side) straight in until it touches the water pump housing.

Mechanical seal installer 90890-04078

Water pump seal installer YM-33221-A

Middle driven shaft bearing driver 90890-04058

Middle drive bearing installer 40 & 50 mm YM-04058

2.  Water pump housing
3.  Mechanical seal installer
4. Middle driven shaft bearing driver

A. Push down

3. Install:

• Mechanical seal (impeller side) "1"

TIP

• Before installing the mechanical seal (impeller side), apply tap water or coolant onto its outer surface.
• If the top of the mechanical seal is dirty, clean it.

4. Measure:

• Impeller shaft tilt

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

NOTICE

Make sure the mechanical seal (impeller side) is flush with the impeller.

Impeller shaft tilt limit 0.15 mm (0.006 in)

1. Straightedge
2. Impeller

See also: