The cylinder head and block have a network of passages, collectively known as the water jacket, through which coolant flows, absorbing the heat generated by combustion. The water pump circulates the coolant through these passages and out to the radiator, where the heat is transferred to the ambient air. Although more and more vehicles are being equipped with electric water pumps, most water pumps are mechanical and driven by a belt from the crankshaft.

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Although cast iron was prevalent in the past, most modern water pumps are aluminum castings. A shaft within the pump rotates on bearings, with the belt driven pulley at one end, and an impeller at the other end to move the coolant. A seal on the shaft prevents coolant from contacting the bearings and leaking past the shaft. Most water pumps connect to the lower radiator hose. When the engine runs, the impeller pushes coolant from the pump into the block.

Symptoms of a bad water pump include coolant leaks, noise from worn shaft bearings, and overheating caused by a broken impeller. The water pump seal can fail from normal wear and high mileage, depleted and contaminated coolant, and from shaft movement caused by bearing wear. A bad seal can cause coolant to leak past the vent hole or water pump shaft, and coolant can also leak from the water pump mounting surfaces. The pump shaft bearings can become worn from excessive drive belt tension and from coolant contamination that washes away the lubricant.

Water pump impellers can be made of metal or plastic. Metal impellers can corrode and the blades can break off. Plastic can degrade and break, and both kinds of impellers can slip on the shaft. A slipping or partially broken impeller will reduce coolant flow, with subsequent elevated engine temperatures or overheating, and complete impeller failure can cause expensive engine damage from overheating if the engine is not shut off in time. Regardless of the failure, we have the replacement water pump that will restore your cooling system’s integrity and performance.

On the majority of the vehicles produced today, the water pump is driven by the timing belt or timing chain. Since many of the same components must be removed to service the pump or timing components, we recommend that the pump be replaced at the same interval the manufacturer specifies for timing assembly replacement. We offer both individual water pumps and the gaskets and seals needed for installation, as well as timing belt kits that include the water pump. No matter which pump you choose you can be confident that it meets or exceeds OE specifications, so you can expect precise fit and original equipment performance.

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Replacement Water Pumps Reviews

Average rating:  5  4.8 - 33 reviews
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5 of 5
Good Product, Too Bad I Didn't Need.
It has a very nice stainless look to it. It would look good if my application was right. Good looking product.
MPosted by Martin (San Antonio, TX) /
1968 Chevy Bel Air
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