Jeep 68027359AA Water Pump

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Failure in the water pump can cause engine damage due to overheating. To check for leaks, use a flashlight to find the weep or vent hole on the water pump from underneath. If the water pump shaft bearings fail, there may be a howling sound at the front of the engine.

Begin by disconnecting the negative battery cable.

Start by disconnecting the battery's negative terminal and draining the cooling system. Remove the coolant reservoir/windshield washer reservoir assembly on V6 models, as well as the cooling fan(s) and shroud. Take off the drivebelts and water pump pulley, and on 2.4L four-cylinder engines, remove the timing belt, timing belt idler pulley, camshaft sprockets, and rear timing belt cover. For 3.7L V6 engines, detach the lower radiator hose from the pump. On 4.0L engines, remove the air filter housing and the right engine mount through-bolt. Use an engine hoist to raise the engine slightly and secure it in place with a jack.

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

Remove the air conditioning compressor mounting bolts and the accessory drivebelt bracket and timing belt. Remove the water pump bolts and detach it from the engine. Clean the bolt threads and threaded holes, and compare the new pump to the old one to ensure they're identical. Remove any old gasket material and clean the engine and new water pump mating surfaces. Apply ATV sealant to the new water pump O-ring for four-cylinder engines or to the gasket mating surface for 3.7L V6 engines. Attach the pump and O-ring/gasket to the engine and tighten the bolts in a criss-cross pattern. For 4.0L engines, install a new O-ring seal in the water pump groove and carefully mate the pump to the engine. Install the water pump mounting bolts and tighten them. Reinstall all parts that were removed for access to the pump, refill the cooling system, and check for leaks.

There are three ways to check the operation of the water pump while it's installed on the engine. If the pump is defective, it should be replaced with a new or rebuilt unit. With the engine running at normal operating temperature, squeeze the upper radiator hose. If the water pump is working properly a pressure surge should be felt as the hose is released. Water pumps are equipped with weep or vent holes. If a failure occurs in the pump seal, coolant will leak from the hole. In most cases, you'll need a flashlight to find the hole on the water pump from underneath to check for leaks. If the water pump shaft bearings fail, there may be a howling sound at the front of the engine while it's running. Shaft wear can be felt if the water pump pulley is rocked up and down. Don't mistake drivebelt slippage, which causes a squealing sound, for water pump bearing failure.

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

Remove the timing belt and water pump mounting bolts. Inspect the water pump for damage and replace if needed. Scrape off old gasket material and install a new O-ring on the coolant inlet pipe. Place the new gasket on the water pump and install it, then press the pump assembly until the coolant inlet pipe seats properly. Install the pump-to-mounting bolts and refill the cooling system.