Disassembling The Water Pump; Checking The Water Pump; Assembling The Water Pump - Yamaha WR250F 2022 Owner's Service Manual

EAM30494

DISASSEMBLING THE WATER PUMP

TIP
• Remove the oil seal when the coolant level
changes frequently more than usual, coolant
has discolored, or engine oil has become
milky.
• Do not use the removed oil seal.
1. Remove:
• Oil seal "1"
1
EAM30259

CHECKING THE WATER PUMP

1. Check:
• Water pump housing cover
• Impeller shaft
• Impeller
Cracks/damage/wear  Replace.
2. Check:
• Bearing
Rotate the inner race with your finger.
Rough spot/seizure  Replace.
EAM30262

ASSEMBLING THE WATER PUMP

1. Install:
• Oil seal "1"
New
TIP
• Apply the lithium-soap-based grease on the oil
seal lip.
• Install the oil seal with its manufacture's marks
or numbers facing the right crankcase cover.
2. Install:
• Bearing "1"
TIP
Install the bearing by pressing its outer race par-
allel.
1
3. Install:
• Impeller shaft assembly "1"
• Washer "2"
• Circlip "3"
• Impeller "4"
TIP
• Take care so that the oil seal lip is not dam-
aged or the spring does not slip off its position.
• When installing the impeller shaft, apply the
engine oil to the oil seal lip, the bearing, and the
impeller shaft.
4
6-7
WATER PUMP
1
1
New
Impeller
14 N·m (1.4 kgf·m, 10 lb·ft)
2
1
3
2
1
E