There is nothing really to knock in a water pump. Look around the front of the engine to see if a bolt/bracket has come loose and is causing this sound. Knocking sounds are NEVER good. Similarly one may ask, what are the signs of a bad water pump?

Why is my water pump making a knocking noise?

Worn valves can allow water to free flow in and out of a valve chamber and not be properly discharged from the pump. This condition can cause a loud knocking noise in the pump. Remove each valve or set of valves and inspect for wear or debris. Clean or replace as necessary.

What are signs that my water pump is going bad?

Common signs include coolant leaks at the front-center of the car, loose water pump pulley, overheating engine, and steam coming from the radiator.

Can water cause engine knocking?

When engine suck in water, they cannot compress the water that gets into the cylinder, so it usually locks up the motor or causes a connecting rod to bend or break. It also could have damaged the engine bearings, which will also make a loud knocking noise.

Related Question Will a bad water pump make a knocking noise?

What does a Hydrolocked engine sound like?

Hydrolocked Engine Symptoms

Your engine will run noticeably rough. If it's just a bit of water, it might blow right through the exhaust, but if more water is drawn in, you'll hear a loud knocking noise as the cylinder fills up. It could be just a second or two, and then your engine will shut off with a thud.

What does water in an engine sound like?

When the coolant cools and condenses, it moves into the radiator. Both of these can cause a gurgling or bubbling sound, and are completely normal. However, there's also the possibility that there is air trapped in the system. As the bubbles move with the flow of coolant, you hear the movement as a “gurgling”.

Is water hammer an emergency?

Water hammer isn't an emergency, but it is something to be concerned about in the sense that you want to have it addressed by a professional ASAP.

Where are water hammer arrestors installed?

Exactly where to place the hammer arrestor will depend on the actual piping arrangement. The best places are either close to the pump, isolation or check valve that is originating the hammer, or at more distant points where the pipe changes direction, for example at the top of a pump riser.

Can a bad expansion tank cause water hammer?

An expansion tank contains a rubber bladder and compressed air that absorb the energy wave as water flows through a pipe. As this device cushions the shock wave, it prevents water hammer. After years of use, the expansion tank can fail as the rubber bladder bursts.

Does A Rear Main Seal Leak Oil Or Transmission Fluid?
Are Airbags Required By Law?