Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Manual - part 62

6-7

COOL

THERMOSTAT

3. Install:

• Coolant temperature sensor

(to the thermostat housing)

CAUTION:

Use extreme care when handling the coolant
temperature sensor. Replace any part that was
dropped or subjected to a strong impact.

T

 

R

.

.

Coolant temperature sensor:

23 Nm (2.3 m · kg, 17 ft · lb)

6-8

COOL

WATER PUMP

WATER PUMP

Order

Job name/Part name

Q’ty

Remarks

Water pump removal

Remove the parts in the order listed.

Oil tank

Refer to “OIL TANK” in CHAPTER 5.

Radiator

Refer to “RADIATOR AND HEAT 
EXCHANGER”.

1

Water pump inlet hose

1

Disconnect.

2

Throttle body outlet hose

1

Disconnect.

3

Water pump outlet hose

1

Disconnect.

4

Water pump assembly

1

5

O-ring

1

For installation, reverse the removal proce-
dure.

5

3

1

2

4

È

LS

New

12 Nm (1.2 m 

•

 kg, 8.7 ft 

•

 lb)

È:   

6-9

COOL

WATER PUMP

Order

Job name/Part name

Q’ty

Remarks

Water pump disassembly

Remove the parts in the order listed below.

1 

Water pump housing cover

1

2 Gasket

1

3 Circlip

2

4 Impeller 

shaft 

assembly

1

5 

Water pump seal

1

6 Oil 

seal

1

7 Bearing

1

8 

Water pump housing

1

For assembly, reverse the disassembly pro-
cedure.

New

1

2

4

New

5

6

7

3

8

New

New

E

6-10

COOL

WATER PUMP

DISASSEMBLY

1. Remove:

• Impeller
• Water pump seal 1 

NOTE:

Remove the water pump seal 1 from the inside of
the water pump housing 2.

2. Remove:

• Bearing 1 
• Oil seal 2 

NOTE:

Remove the bearing 1 and oil seal 2 from the
inside of the water pump housing 3.

3. Remove:

• Rubber damper holder 1 
• Rubber damper 

2 

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

NOTE:

Do not scratch the impeller shaft.

1

2

INSPECTION

1. Inspect:

• Water pump housing cover
• Water pump housing
• Impeller
• Rubber damper
• Rubber damper holder
• Water pump seal
• Oil seal

Cracks/damage/wear 

→ Replace.

2. Inspect:

• Bearing

Rough movement 

→ Replace.