Water Pump: Service and Repair
WATER PUMPWATER 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 hose and clamp securely, then check for leaks using radiator can tester.
REMOVAL
1. Remove undercover using power tools.
2. Remove drive belts.
3. Drain coolant from radiator.
CAUTION: Perform when the engine is cold.
4. Remove air duct.
5. Remove radiator upper hose and lower hoses.
6. Remove radiator shrouds.
7. Remove cooling fan.
8. Remove water drain plug on water pump side of cylinder block.
9. Remove chain tensioner cover and water pump cover.
10. Remove the chain tensioner assembly with the following procedure.
a. Pull the lever down and release the plunger stopper tab.
Plunger stopper tab can be pushed up to release (coaxial structure with lever).
b. Insert the stopper pin into the tensioner body hole to hold the lever and keep the stopper tab released.
c. Insert the plunger into the tensioner body by pressing the timing chain slack guide.
d. Keep the slack guide pressed and hold the plunger in by pushing the stopper pin deeper through the lever and into the tensioner body hole.
e. Turn crankshaft pulley approximately 20� clockwise so that the timing chain on the chain tensioner side is loose.
11. Remove chain tensioner.
CAUTION: Be careful not to drop mounting bolts inside chain case.
12. Remove the 3 water pump fixing bolts. Secure a gap between water pump gear and timing chain, by turning crankshaft pulley approximately 20� counterclockwise.
13. Screw Me bolts [pitch: 1.25 mm (0.049 inch) length: approximately 50 mm (1.97 inch)] into water pumps upper and lower mounting-bolt holes until they reach timing chain case. Then, alternately tighten each bolt for a half turn, and pull out water pump.
Pull straight out while preventing vane from contacting socket in installation area.
Remove water pump without causing sprocket to contact timing chain.
14. Remove Me bolts and O-rings from water pump.
INSPECTION AFTER REMOVAL
1. Check for badly rusted or corroded water pump body assembly.
2. Check for rough operation due to excessive end play.
INSTALLATION
1. Install new O-rings to water pump.
2. Apply engine oil and coolant to the O-rings as shown.
Locate the O-ring with white paint mark to engine front side.
3. Install the water pump.
- Do not allow cylinder block to nip the O-rings when installing the water pump.
- Check that timing chain and water pump sprocket are engaged.
- Insert water pump by tightening mounting bolts alternately and evenly.
4. Remove dust and foreign material completely from backside of chain tensioner and from installation area of rear timing chain case.
5. Turn the crankshaft pulley approximately 20° clockwise so that the timing chain on the timing chain tensioner side is loose.
When installing the timing chain tensioner, engine oil should be applied to the oil hole and tensioner.
6. Install the timing chain tensioner.
7. Remove the stopper pin.
8. Install chain tensioner cover and water pump cover.
a. Before installing, remove all traces of RTV Silicone Sealant from mating surface of water pump cover and chain tensioner cover using a scraper.
Also remove traces of RTV Silicone Sealant from the mating surface of the front cover.
b. Apply a continuous bead of Genuine RTV Silicone Sealant, or equivalent, to mating surface of chain tensioner cover and water pump cover.
9. Install water drain plug on water pump side of cylinder block.
10. Installation is in the reverse order of removal.
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 tensioner. The engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.