Honda 19200-P8A-A02 Water Pump (Yamada)

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A failure in the water pump can cause serious engine damage due to overheating. There are two 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. Water pumps are equipped with weep (or vent) holes. If a failure occurs in the pump seal, coolant will leak from the hole. With the timing belt cover removed, a flashlight and small mirror are needed 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 pump while it's running. Shaft wear can be felt with the timing belt removed if the water pump pulley is rocked up and down with the engine off. Drivebelt slippage, which causes a squealing sound, should not be mistaken for water pump bearing failure. Even a pump that exhibits no outward signs of a problem, such as noise or leakage, can still be due for replacement. Removal for close examination is the only sure way to tell. Sometimes the fins on the back of the impeller can corrode to the point that cooling efficiency is hampered.

Disconnect the cable from the negative battery terminal. Drain the cooling system and if the coolant is relatively new or in good condition, save it and reuse it. Remove the drive belts, followed by the timing belt, timing belt tensioner, and adjuster assembly. Take out the mounting bolts and detach the water pump from the engine. Clean the bolt threads and the threaded holes in the engine to eliminate corrosion and sealant. Compare the new pump with the old one to ensure they are identical. Remove all traces of sealant or O-ring from the engine mating surface. Clean the engine and new water pump mating surfaces with lacquer thinner or acetone. Apply a thin layer of RTV sealant to the O-ring groove of the new pump, and carefully set a new O-ring in the groove. Attach the pump to the engine and thread the bolts into the holes finger tight. Apply a small amount of RTV sealant on the bolt threads, ensuring any dowel pins are in their original locations. Tighten the bolts, reinstall all parts removed for pump access, and reconnect the battery. Finally, refill and bleed the cooling system, check the drive belt tension, run the engine, and ensure there are no leaks.

Clean the bolt threads and the threaded holes in the engine to remove corrosion and sealant.

If the pump is defective, replace it with a new or rebuilt unit.

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