Car engines burn petrol or diesel to generate heat inside the combustion chamber. The heat causes pressure, pushing the piston down so it can drive the crankshaft. As the hot exhaust gas stays in the cylinder during the combustion stroke, it transfers a lot of heat to the piston, cylinder walls and cylinder head. To prevent the engine from overheating, this heat is drained away by a water-antifreeze mixture, which transports the heat from the engine to a high surface, air-cooled radiator.
To transport the heated coolant from the engine to the radiator, the manufacturer partly relies on a natural effect known as a "thermo-siphon effect". As water expands when it’s heated, its density decreases. That's why hot water will rise, while cold water will sink. As the water is heated in the engine and cooled in the radiator, it rises in the engine and sinks in the radiator, so it will circulate automatically. This effect, however, is too small to create a sufficient water flow to the radiator. That is why a water pump assists this flow.
Water pumps are usually of the centrifugal type. This means that blades on a rotor move coolant in a circular motion, flinging it to the outside of the rotor blades where it can escape into the outlet pipe. The rotor is attached to a shaft, which is driven by a V-belt, a multi-rib belt or by the timing belt, depending on the type of engine. The shaft runs in two bearings, a spring loaded seal prevents water from leaking away.
As the water seal in the water pump is a sliding seal, it is subject to wear. Eventually, it will start leaking, slowly draining the coolant from the engine, causing overheating. Water will also enter the water pump bearings, washing away the lubricant. The bearings will wear quickly, causing vibration. Eventually, they will seize, breaking v-belts, multi-rib belts or the timing belt.
Leaking or rattling water pumps should be replaced immediately. Timing belt driven water pumps should be replaced preventively, when the timing belt is replaced. Not only because a broken water pump can damage the belt, but also because you are nearly there when you replace the belt anyway, saving a lot of labour costs for the client combining the two jobs.
The quality and life span of a water pump depends on many factors, like the stability of the housing, the quality of the bearings and the material and manufacturing precision of the water seal. As Nipparts goal is to provide high quality at an affordable price, Nipparts uses high-grade materials and high precision manufacturing processes to produce water pumps. All Nipparts water pumps offer OE matching quality and are available for a wide range of Asian and Korean cars.
Nipparts Water Pumps
- Top quality bearings
- High quality seals
- OE matching quality