Water Pump; Disassembly; Inspection; Assembly - Yamaha YTZ250S 1986 Service Manual

WATER PUMP
Disassembly
NOTE: ______________________ ___
It is necessary to disassemble the water pump,
unless there is no abnormarity such as ex-
cessive change in coolant level, discoloration
of coolant, or milky transmission oil.
Inspection
1. Remove the deposits from the impeller
and water pump housing.
2. Check the impeller for cracks and
damage. Replace if necessary.
3. Check for wear of the impeller, and
replace it as required.
4. Check the oil seal and bearing for damage
and wear. If
damag~d
or worn excessive-
ly, replace the oil seal and bearing as a set.
NOTE: ______________________ _
When · installing the oil seal, make sure the
"WATER SIDE" mark is on the outside.
Assembly
l
Q)@
®
1. Pump housing
4. Driven sprocket
2. Impeller shaft
5. Circlip
3. Pin
3-18