Honda 19200-RDV-J01 Water Pump (Yamada)

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If a failure occurs in the pump seal, coolant will leak from under the engine timing belt cover (V6 models) or from the weep hole(s) on the water pump (four-cylinder models).

Gradually tighten the bolts in 1/4-turn increments to the torque specified in the Specifications. Avoid over-tightening, as this could distort the pump and lead to leaks.

Disconnect the cable from the negative battery terminal. Drain the cooling system. If the coolant is relatively new or in good condition, save it and reuse it. Remove the drivebelts. Remove the timing belt, and remove the timing belt tensioner. Remove the bolts and detach the water pump from the engine. Check the impeller for evidence of corrosion or missing fins. Clean the bolt threads and the threaded holes in the engine to remove corrosion and sealant. Compare the new pump to the old one to make sure they're identical. Remove all traces of old gasket sealant and O-ring from the engine. Clean the engine and new water pump mating surfaces with lacquer thinner or acetone. Apply a thin layer of RTV sealant to the 0-ring groove of the new pump, then carefully set a new 0-ring in the groove. Carefully attach the pump to the engine and thread the bolts into the holes finger tight. Use a small amount of RTV sealant on the bolt threads, and make sure that the dowel pins are in their original locations. Install the remaining bolts. Tighten the bolts in 1/4-turn increments. Don't over-tighten the bolts or the pump may be distorted. Reinstall all parts removed for access to the pump. Refill and bleed the cooling system and check the drivebelt tension. Run the engine and check for leaks. Reconnect the battery.

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

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.

A failure in the water pump can cause serious engine damage due to overheating. The water pump is driven by the timing belt and is located beneath the timing belt cover. Water pump leaks are harder to detect with this design. Look for coolant coming out the lower timing belt cover. 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, use a flashlight and small mirror to find the hole on the water pump from underneath to check for leaks. If there is coolant on any of the timing belt components or covers, consider this evidence of a severe leak. 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). Don't mistake drivebelt slippage, which causes a squealing sound, 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. If the pump is defective, replace it with a new or rebuilt unit.