GMC 12681417 Water Pump Kit

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To remove the 4.3L V6, 5.3L, and 6.2L V8 engines, start by disconnecting the cable from the negative terminal of the battery. Then, drain the coolant and remove the air intake duct and resonator assembly. Next, remove the drivebelt and center the water pump pulley holes over the water pump mounting bolts. Remove the water pump and gasket from the coolant manifold, and clean the mounting surface on the engine and water pump. Clean the mounting bolt threads and threaded holes if necessary. Compare the replacement pump with the old one to ensure they're identical. Place the gaskets and water pump into position, and tighten the bolts to the torque specification. The remaining installation steps are the reverse of the removal procedure. Refill the engine with coolant, run the engine, and check for leaks. For the 6.0L V8 removal, follow similar steps, but also remove the fan, fan clutch, water pump inlet hose, water pump outlet hose, and coolant air bleed hose if necessary. Remove the thermostat housing if a new water pump is to be installed. Unbolt the water pump, clean the mounting surface, compare the replacement pump, and install the gaskets and water pump. Tighten the bolts, complete the remaining installation steps, refill the engine with coolant, run the engine, and check for leaks.

If a failure occurs in the shaft seal on the water pump, a coolant leak can usually be seen coming from that area. Water pumps are equipped with small weep or vent holes that can be checked for leaks using a flashlight. If the water pump shaft bearings fail, there may be a howling sound near the water pump while it's running.

Water pump failure can lead to overheating and there are several ways to check the operation of the water pump. Additionally, the effectiveness of the water pump can be checked by removing it for examination, as the impeller fins may corrode away. The drive belt and coolant hoses connected to the pump must be disconnected. The water pump can be unbolted, and, tapped with a soft-face hammer to break the gasket seal. The sealing surfaces of the water pump and block should be cleaned of all gasket material. To install the water pump, a thin layer of RTV sealant should be applied to the new gasket, and the gasket should be installed on the water pump.

Water pump failure can lead to overheating, there are several ways to check the operation of the water pump while it is installed on the engine. Excessive bearing wear can be identified by attempting to move the water pump pulley horizontally or vertically. To replace the water pump, the coolant must be drained and various components such as the air cleaner assembly, radiator shroud, fan/clutch assembly, and drive removed. The specific steps for removal and installation vary depending on the engine type. Coolant should be added to the specified level and the coolant level checked. Also, it is important to bleed the cooling system of air and check for any coolant leaks around the water pump and hoses.

To replace the water pump, various components such as the air cleaner assembly, radiator shroud, fan/clutch assembly, and drive belt must be removed.

If the water pump shaft bearings fail, there may be a howling sound near the water pump while it's running.

There are several ways to check if the water pump is functioning properly.

If the water pump shaft bearings fail, there may be a howling sound near the water pump while it's running.

Clean the sealing surfaces of the water pump and block of all gasket material, and wipe the mating surfaces with lacquer thinner or acetone. Apply a thin layer of RTV sealant to both sides of the new gasket, and install the gasket on the water pump.

A quick water pump performance check is to turn the heater on.

12681417 come with all the parts coolant use part# 12346290 per vin#