Disassembling The Water Pump; Checking The Water Pump; Assembling The Water Pump - Yamaha YFM70RY Service Manual

EAS26510

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
2. Remove:
• Bearing "1"
• Oil seal "2"
TIP
Remove the bearing and oil seal from the out-
side of the water pump housing "3".
EAS26540

CHECKING THE WATER PUMP

1. Check:
• Water pump housing "1"
• Impeller "2"
• Water pump housing cover "3"
Cracks/damage/wear → Replace.
3
1
1
3
2
1
2
2. Check:
• Bearing
Rough movement → Replace.
• Impeller shaft gear
Pitting/wear → Replace.
EAS26560

ASSEMBLING THE WATER PUMP

1. Install:
New
• Oil seal "1"
(into the water pump housing "2")
TIP
• Before installing the oil seal, apply tap water or
coolant onto its outer surface.
• Install the oil seal with a socket "3" that match-
es its outside diameter.
1
2
2. Install:
• Water pump seal "1"
(into the water pump housing "2")
ECA14080
NOTICE
Never lubricate the water pump seal surface
with oil or grease.
TIP
Install the water pump seal with the special tools.
Mechanical seal installer
90890-04132
Water pump seal installer
YM-33221-A
Middle driven shaft bearing driv-
er
90890-04058
Bearing driver 40 mm
YM-04058
6-7
WATER PUMP
3
0.5–1.0 mm
(0.02–0.04 in)
New
New