Disassembling The Water Pump; Checking The Water Pump; Assembling The Water Pump - Yamaha YZ450FP 2023 Owner's Service Manual

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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
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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.
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ASSEMBLING THE WATER PUMP

1. Install:
• Oil seal "1"
New
TIP
• Apply the lithium-soap-based grease on the oil
seal lip.
• Make sure the projections "a" on the oil seal
point to the outside, and then install the oil seal.
a
2. Install:
• Bearing "1"
New
TIP
Install the bearings by pressing its outer race
parallel.
1
3. Install:
• O-ring "1"
New
• Water pump housing "2"
• Impeller shaft assembly "3"
• Circlip "4"
New
TIP
Take care so that the oil seal lip is not damaged
or the spring does not slip off its position.
1
2
3
4. Install:
• Dowel pin "1"
• O-ring "2"
New
6-8
WATER PUMP
1
4