Service manual

COOLANT CIRCULATING PUMP
REMOVING THE PUMP
Remove in the following order: coolant (drain as needed);
V-belt; water hoses; water pump attaching nuts; and water
pump.
DISASSEMBLY
1. Remove the pump pulley boss by using a support and
press.
2. Remove the bearing shaft from the impeller and bearing
housing by using a support block and press.
3. Remove the snap ring with snap ring pliers and press out
the water pump shaft from the bearings.
TUBULAR
SUPPORT
INSPECTION
Inspect the shaft, bearings and impeller. Look for cracks and
damage. Check the housing
gasket and inspect the rear seals
and small end gaskets. Replace any parts that show wear.
ASSEMBLY
Assemble the water pump in the reverse order of
disassembly, using the following procedure:
1. Fill lithium grease (lithium base NLGI
No.2) into the
following positions.
• Ball bearings
• Approximately 113 space between both ball bearings
• Space between the ball bearing and water baffle plate.
2. Apply a thin coat
of engine oil to the press fit surface
of the water seal and press the larger end into the
proper aperture
of the pump using a tubular
mandrel. (Mazda tool
# 490636 145).
SPRING LOADED SEAL
BEARINGS .
RETAINING RING
COLLAR TOOL
(490636145)
IMPELLER
SEAL
NOTE: Do not allow oil- or grease to contaminate the
surfaces of the ceramic ring or the graphite (small end)
of the spring-loaded seal.
3. After the water pump has been assembled, check if the
pump shaft rotates smoothly.
INSTALLING THE PUMP
1. Install in the reverse order of removal.
NOTE: Use a new gasket.
2. After installing the pump, fill the system with coolant and
operate the engine to check for leaks.
Engines & Generators
41