Water Pump: Service and Repair

REMOVAL

NOTE: It is normal for the water pump to weep a small amount of coolant from the weep hole (black stain at weep passage). Do not replace the water pump if this condition exists. Replace the water pump if a heavy deposit or a steady flow of engine coolant is evident on side of the cylinder block from the weep hole passage (shaft seal failure). Be sure to perform a thorough analysis before replacing water pump.

WARNING: DO NOT REMOVE PRESSURE CAP WITH THE SYSTEM HOT AND PRESSURIZED. SERIOUS BURNS FROM COOLANT CAN RESULT.

1. Disconnect negative battery cable.
2. Drain cooling system.

NOTE: The water pump is driven by the primary timing chain.

3. Remove the timing chain cover, timing chain, and all chain guides.





4. Remove bolts attaching water pump to block.
5. Remove water pump and gasket.

CLEANING
Clean gasket mating surfaces as necessary.

INSPECTION
Inspect and replace the water pump if it has any of the following defects:
1. Damage or cracks on the pump body.





2. Coolant leaks; if the shaft seal is leaking, this will be evident by traces of thick deposits of dried glycol running down from the pump weep passage and components below. A thin black stain below pump weep hole/passage is considered normal operation.
3. Impeller rubs inside of cylinder block.
4. Excessively loose or rough turning bearing.

NOTE: It is normal for the water pump to weep a small amount of coolant from the weep hole. Do not replace the water pump if this condition exists. Replace the water pump if a heavy deposit or a steady flow of engine coolant is evident from the weep passage. This indicates a shaft seal failure and pump must be replaced. Be sure to perform a thorough analysis before replacing water pump.

INSTALLATION
1. Clean all sealing surfaces.
2. Install water pump and gasket. Tighten mounting bolts to 12 Nm (105 inch lbs.).
3. Install timing chain guides, timing chain, and timing chain cover.
4. Reconnect negative battery cable.
5. Fill cooling system.