Water Pump Shaft Seal Leak

When the shaft seal fails it allows water to run down the backside of the seal plate through the hole where the motor shaft slides through.

Water pump shaft seal leak.

If operating vibration levels are high the shaft suffers from excessive radial or axial movement or is misaligned excessively leakage rates tend to be higher. Some signs are water coming from behind the seal plate and collecting underneath the pump where the motor and wet end meet. The reasons why a water pump seal might begin to leak include. The water pump seal prevents water and antifreeze from leaking out and overheating your vehicle s engine.

Pumps are specially designed and manufactured to cater for a whole range of different applications. A leak here is a common cause of motor failure so it s crucial to address quickly. Its main responsibility is to control leakage. Water pumps can leak from 2 different places.

Between the pump motor and impeller is the all important shaft seal that keeps water out of the motor. A mechanical seal is a device that is used to control leakage between a rotating shaft and a liquid or gas filled vessel. The shaft seal or the water pump gasket. If the gasket fails either from age or damage from dirty coolant you will see a leak where the water pump bolts to the block or timing cover.

This is usually a problem with the shaft seal. According to aa1car most water pumps are designed to go 100 000 miles or more but it s not unusual to see leaks occur after 50 000 or 60 000 miles. This seal prevents water from escaping the system at the shaft that turns the impeller and isolates the wet components of the pump from the dry electric motor. And lastly a leak can occur where the electric motor attaches to the pump.

Often seal face leakage rates will depend on pump motor operating conditions. If the water pump bearings are starting to wear out they will allow the shaft to wobble and coolant will leak out. High temperatures it is inevitable that at some point the polished rubber surface of the seal will succumb to the high temperatures it is subjected to every time the vehicle s ignition is switched on. Typically seals leak more during dynamic operation than in a static condition under fluid pressure.

The need for mechanical seals. Leaking pump shaft seal. Every pool pump has a mechanical shaft seal which prevents water from leaking along the motor shaft behind the impeller.