Removing The Impeller Shaft; Removing The Oil Seal; Checking The Oil Delivery Pipe; Checking The Impeller Shaft - Yamaha YZ250F 2008 Owner's Service Manual

REMOVING THE IMPELLER
SHAFT
1. Remove:
• Impeller "1"
• Washer "2"
• Impeller shaft "3"
Hold the impeller shaft on its width
across the flats "a" with spanners,
etc. and remove the impeller.

REMOVING THE OIL SEAL

It is not necessary to disassemble the
water pump, unless there is an abnor-
mality such as excessive change in
coolant level, discoloration of coolant,
or milky transmission oil.
1. Remove:
• Bearing "1"
2. Remove:
• Oil seal "1"
CHECKING THE OIL DELIVERY
PIPE
1. Inspect:
• Oil delivery pipe "1"
→
Bend/damage Replace.
→
Clogged Blow.
OIL FILTER ELEMENT AND WATER PUMP

CHECKING THE IMPELLER SHAFT

1. Inspect:
• Impeller shaft "1"
Bend/wear/damage
→
Fur deposits Clean.
CHECKING THE IMPELLER SHAFT
GEAR
1. Inspect:
• Gear teeth "a"
→
Wear/damage Replace.
CHECKING THE BEARING
1. Inspect:
• Bearing
Rotate inner race with a finger.
Rough spot/seizure
CHECKING THE OIL SEAL
1. Inspect:
• Oil seal "1"
→
Wear/damage Replace.
INSTALLING THE OIL SEAL
1. Install:
• Oil seal "1"
4-36
• Apply the lithium soap base grease
on the oil seal lip.
• Install the oil seal with its manufac-
ture's marks or numbers facing the
right crankcase cover "2".
→
Replace.
2. Install:
• Bearing "1"
Install the bearing by pressing its out-
er race parallel.
INSTALLING THE IMPELLER
SHAFT
1. Install:
• Impeller shaft "1"
• Washer "2"
• Impeller "3"
→
Replace.
• Take care so that the oil seal lip is
not damaged or the spring does not
slip off its position.
• When installing the impeller shaft,
apply the lithium soap base grease
on the oil seal lip and impeller shaft.
And install the shaft while turning it.
• Hold the impeller shaft on its width
across the flats "a" with spanners,
etc. and install the impeller.
Impeller:
14 Nm (1.4 m•kg, 10
ft•lb)