Verifying Water Pump Problem

VERIFYING WATER PUMP PROBLEM

Check for Loose Water Pump Pulley
As the pump shaft seals and bearings wear with age the pulley/shaft may develop a wobble or lateral runout.



- With the engine off and the key removed from the ignition, attempt to move the pulley from side to side and back and forth. There should be no detectable movement. The pulley should turn smoothly, with no rough spots.
- The water pump should be replaced if any pulley wobble is detected. If the water pump is not replaced the pump shaft may eventually seize or break.

NOTE: Incorrect belt tension (too tight) may cause premature wear of the bearings and seals.




WARNING: Never remove a radiator cap while the engine is hot. Severe personal injury may result.

Inspect for Leakage
1. With the engine "OFF" and cold:
- Check coolant level and refill if necessary.




- Inspect the water pump for leakage. Closely check the following areas:
- Inspection (weep) hole.
- Pump shaft.
- Gasket.




2. Pressurize the cooling system with a pressure tester and again check for leaks. Do not exceed the rated pressure of the radiator cap.

NOTE: If any leaks are found, verify that they are not originating from a component near or above the water pump (i.e. thermostat, loose radiator hoses, intake gasket, engine coolant temperature sensor)

CAUTION: When finished, immediately re-install the radiator cap.

3. If no leaks are found, start and warm the engine until the thermostat opens. Stop the engine and check for fresh leakage around the water pump shaft.

NOTE: Occasionally water pumps will only leak around the shaft seals while the shaft is rotating.