Water Pump: Service and Repair

Water Pump

REMOVAL
1. Remove the radiator.
2. Remove the V-belts.
3. Remove the timing belt.





4. Remove the automatic belt tension adjuster.





5. Remove the belt idler No. 2.
6. Remove the camshaft sprocket (LH) by using ST.
ST 18231AA010 CAMSHAFT SPROCKET WRENCH





NOTE: Also the CAMSHAFT SPROCKET WRENCH (499207100 can be used.





7. Remove the belt cover No. 2 (LH).





8. Remove the tensioner bracket.
9. Disconnect the heater by-pass hose from water pump.





10. Remove the water pump.

INSTALLATION
1. Install water pump onto cylinder block (LH).

NOTE:
^ Replace the gasket with a new one.
^ When installing the water pump, tighten bolts in two stages in alphabetical sequence as shown in the figure.





Tightening torque:
First: 12 Nm (1.2 kgf-m, 8.7 ft. lbs.)
Second: 12 Nm (1.2 kgf-m, 8.7 ft. lbs.)
2. Connect the heater by-pass hose to water pump.





3. Install the belt cover No. 2 (LH).
Tightening torque: 5 Nm (0.5 kgf-m, 3.6 ft. lbs.)





4. Install the tensioner bracket.
Tightening torque: 25 Nm (2.5 kgf-m, 18.1 ft. lbs.)
5. Install the camshaft sprockets (LH) by using ST.
ST 18231AA010 CAMSHAFT SPROCKET WRENCH





NOTE: Also the CAMSHAFT SPROCKET WRENCH (499207100 can be used.

Tightening torque: 78 Nm (8.0 kgf-m, 57.9 ft. lbs.)





6. Install the belt idler No. 2.
Tightening torque: 39 Nm (4.0 kgf-m, 28.9 ft. lbs.)
7. Install the automatic belt tension adjuster which tension rod is held with pin.
8. Install the timing belt.
9. Install the V-belts.
10. Install the radiator.

INSPECTION
1. Check the water pump bearing for smooth rotation.
2. Check the water pump pulley for abnormalities.





3. Using a dial gauge, measure the impeller runout in thrust direction while rotating the pulley.
"Thrust" runout limit: 0.5 mm (0.020 inch)





4. Check the clearance between impeller and pump case.
Clearance between impeller and pump case:
Standard 0.5 - 0.7 mm (0.020 - 0.028 inch)
Limit 1.0 mm (0.039 inch)
5. After water pump installation, check the pulley shaft for engine coolant leaks. If leaks are noted, replace the water pump assembly.