Mopar 4781157AB Water Pump Replaces

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A failure in the water pump can lead to engine damage so be sure to check for a leak, remove the lower engine splash shield, and use a flashlight to look for traces of coolant residue. If the water pump shaft bearings do not work, there may be a howling sound near the water pump. If there is no heat output, it may indicate a failing water pump.

To perform a quick water pump performance check, ensure that the coolant level is full, start the vehicle and let it warm up fully, and turn on the heater in the passenger compartment. If there is little or no heat output, it may indicate a failing water pump as coolant flow does not appear to be going through the heater core.

To replace the water pump on a vehicle with a V6 engine, follow these steps:Loosen the water pump pulley bolts.Remove the drivebelt.Remove the pulley bolts and position the pulley to access the water pump mounting bolts.Remove the water pump and pulley together by rotating and moving the pulley inward between the pump housing and the hub.Clean the bolt threads and threaded holes in the timing case cover to remove corrosion and sealant.Remove the old seal and clean the mating surfaces.Install a new O-ring seal in the groove on the water pump body and use RTV sealant to hold it in place during installation.Position the water pump pulley loosely between the pump housing and drive hub.Install the water pump mounting bolts and tighten them to the specified torque. Avoid over-tightening.Position the pulley onto the drive hub and install the mounting bolts finger-tight.Install the drivebelt and tighten the pulley bolts to the specified torque. Avoid over-tightening. Position the pulley onto the drive hub and install the mounting bolts finger-tight. Install the drivebelt and tighten the pulley bolts to the specified torque. The remaining steps of installation involve reversing the removal process. Refill and bleed the cooling system after completing the installation. Run the engine and check for leaks and proper operation.

To replace the water pump on a vehicle with a V6 engine, follow these steps:Loosen the water pump pulley bolts.Remove the drivebelt.Remove the pulley bolts and position the pulley to access the water pump mounting bolts.Remove the water pump and pulley together by rotating and moving the pulley inward between the pump housing and the hub.Clean the bolt threads and threaded holes in the timing case cover to remove corrosion and sealant.Remove the old seal and clean the mating surfaces.Install a new O-ring seal in the groove on the water pump body and use RTV sealant to hold it in place during installation.Position the water pump pulley loosely between the pump housing and drive hub.Install the water pump mounting bolts and tighten them to the specified torque. Avoid over-tightening.Position the pulley onto the drive hub and install the mounting bolts finger-tight.Install the drivebelt and tighten the pulley bolts to the specified torque. Avoid over-tightening. Position the pulley onto the drive hub and install the mounting bolts finger-tight. Install the drivebelt and tighten the pulley bolts to the specified torque. The remaining steps of installation involve reversing the removal process. Refill and bleed the cooling system after completing the installation. Run the engine and check for leaks and proper operation.

A failure in the water pump can cause serious engine damage due to overheating.

Remove the drive belt, bolts, and detach the water pump from the front cover. Clean bolt threads and threaded holes, remove the old O-ring, and apply a thin bead of RTV sealant to the water pump mating surface. Install a new O-ring in the groove, attach the new pump to the front cover, and then reinstall the drivebelt and refill the cooling system. Run the engine and check for leaks.