Water Pump: Service and Repair

Water Pump

CAUTION:
- When removing water pump assembly, be careful not to get coolant on drive belt.
- Water pump cannot be disassembled and should be replaced as a unit.
- After installing water pump, connect hoses and clamps securely, then check for leaks using radiator cap tester.

Removal
1. Drain coolant from radiator and cylinder block.
2. Remove cylinder head front mounting bracket.
3. Loosen water pump pulley bolts.
4. Remove drive belts for power steering pump.
5. Remove water pump pulley.
6. Remove coolant hoses from water inlet and thermostat housing.





7. Remove water pump bolts.
8. Remove water pump with thermostat housing.

Inspection





- Check body assembly and vane for rust or corrosion.
- Check for rough operation due to excessive end play.

Installation





1. Use a scraper to remove liquid gasket from water pump and thermostat housing.
- Also remove old liquid gasket from mating surface of cylinder block.





2. Apply a continuous bead of liquid gasket to mating surface of water pump.
- Use Genuine RTV silicone sealant Part No. 999 MP-A7007 or equivalent.
When installing drive belts, refer to Drive Belt. When filling radiator with coolant, refer to Coolant.

Thermostat





Be careful not to spill coolant over engine compartment.
Use a rag to absorb coolant.
- Use Genuine RTV silicone sealant Part No. 999 MP-A7007 or equivalent.

Inspection
1. Check for valve seating condition at normal room temperature. It should seat tightly.





2. Check valve opening temperature and valve lift.





3. Then check if valve closes at 5°C (9°F) below valve opening temperature.

Installation





- When installing water inlet apply liquid gasket as shown.
- Use Genuine RTV silicone sealant Part No. 999 MP-A7007 or equivalent.





- Install thermostat with jiggle valve or air bleeder at upper side.
After installation, run engine for a few minutes, and check for leaks.

Water Outlet

Inspection





Visually inspect for water leaks. If there is leakage, apply liquid gasket.

Installation
1. Use a scraper to remove old liquid gasket from water out let.
- Also remove traces of liquid gasket from mating surface of cylinder head.





2. Apply a continuous bead of liquid gasket to mating surface of water outlet.
- Use Genuine RTV silicone sealant Part No. 999 MP-A7007 or equivalent.