Water Pump: Service and Repair

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 hose and clamp securely, then check for leaks using radiator cap tester.

WATER PUMP:

REMOVAL
1. Remove undercover.
2. Remove suspension member stay.
3. Drain coolant from radiator.
4. Remove radiator shrouds.
5. Remove drive belts.
6. Remove cooling fan.






7. Remove water drain plug on water pump side of cylinder block.
8. Remove chain tensioner cover and water pump cover.






9. Pushing timing chain tensioner sleeve, apply a stopper pin so it does not return. Then remove the chain tensioner assembly.






10. Remove the 3 water pump fixing bolts. Secure a gap between water pump gear and timing chain, by turning crankshaft pulley 20° backwards.






11. Put M8 bolts to two water pump fixing bolt holes.






12. Tighten M8 bolts by turning half turn alternately until they reach timing chain rear case.
In order to prevent damages to water pump or timing chain rear case, do not tighten one bolt continuously. Always turn each bolt half turn each time.

13. Lift up water pump and remove it.
When lifting up water pump, do not allow water pump gear to hit timing chain.






INSPECTION
1. Check for badly rusted or corroded body assembly.
2. Check for rough operation due to excessive end play.

WATER PUMP:

INSTALLATION
1. Apply engine oil and coolant to O-rings as shown in the figure.






2. Install water pump.
Do not allow cylinder block to nip O-rings when installing water pump.






3. Before installing, remove all traces of liquid gasket from mating surface of water pump cover and chain tensioner cover using a scraper. Also remove traces of liquid gasket from mating surface of front cover.






4. Apply a continuous bead of liquid gasket to mating surface of chain tensioner cover and water pump cover. Use Genuine RTV silicone sealant or equivalent.






5. Return the crankshaft pulley to its original position by turning it 20° forward.






6. Install timing chain tensioner, then remove the stopper pin.
- When installing the timing chain tensioner, engine oil should be applied to the oil hole and tensioner.
- After starting engine, let idle for three minutes, then rev engine up to 3,000 rpm under no load to purge air from the high-pressure chamber of the chain tensioners. The engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.

7. Reinstall any parts removed in reverse order of removal.