Yamaha YZF-R1 Series Service Manual page 404

EAS30446
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".
1
2. Remove:
• Bearing "1"
• Oil seal "2"
TIP
Remove the oil seal and bearing from the out-
side of the water pump housing "3".
1
3. Remove:
• Mechanical seal (impeller side) "1"
(from the impeller, with a thin, flat-head
screwdriver)
TIP
Do not scratch the impeller shaft.
G089034
EAS30447
CHECKING THE WATER PUMP
1. Check:
• Water pump housing cover
• Impeller shaft
Cracks/damage/wear → Replace.
• Water pump housing
Cracks/damage/wear → Replace the water
pump assembly.
2. Check:
• Bearing
Rough movement → Replace.
3. Check:
2
• Water pump inlet pipe
• Water pump outlet pipe
Cracks/damage/wear → Replace.
EAS30448
ASSEMBLING THE WATER PUMP
1. Install:
• Oil seal "1"
• Bearing "2"
(into the water pump housing "3")
TIP
Install the oil seal with a socket "4" that matches
2
its outside diameter.
3
a
2. Install:
• Mechanical seal (housing side) "1"
ECA20330
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.
6-15
WATER PUMP
New
New
Installed depth "a"
0.5–1.0 mm (0.02–0.04 in)
4
3
1
2
New