4-12 COOLING SYSTEM
Water Pump Inspection
Check the drainage outlet passage [A] at the bottom of
the water pump housing for coolant leaks.
If a coolant leak or ooze is found, start the engine and
check if the coolant leaks continuously.
When coolant does not continuously leak, it is normal.
If the mechanical seal is damaged, the coolant continu-
ously leaks through the drainage outlet passage. Replace
the mechanical seal unit.
If the oil seal is damaged, engine oil leaks through the
drainage outlet passage. Replace the oil seal.
Water Pump Impeller Disassembly/Assembly
Remove the water pump impeller (see Water Pump Re-
The sealing seat [A] and rubber seal [B] may be removed
easily by hand.
Apply water or coolant around the surfaces of the rubber
seal and sealing seat.
Install the rubber seal and sealing seat into the impeller by
pressing them by hand until the seat stops at the bottom
of the hole.
Install the water pump impeller (see Water Pump Instal-
Water Pump Impeller Inspection
Remove the water pump cover (see Water Pump Re-
Visually inspect the water pump impeller [A].
If the surface is corroded or if the blades are damaged,
replace the water pump impeller.
Water Pump Housing Disassembly
Do not damage the hole wall of the water pump
Insert a bar [A] into the pump housing [B], and hammer
evenly around the circumference of the mechanical seal