Hydrolocked Engine: If a significant amount of water entered the intake, it could have caused a condition known as hydrolock. This happens when water in the combustion chamber prevents the piston from moving freely. The resulting knocking sound occurs when the piston comes in contact with the water, creating a slapping or knocking noise.
Bent or Damaged Connecting Rods: Hydrolock due to water entering the intake can exert extreme force on the engine components. This force can cause the connecting rods, which link the pistons to the crankshaft, to bend or become damaged. When bent, the connecting rods can create a knocking sound as they move up and down.
Damaged Pistons or Piston Rings: Similarly, the sudden force caused by water entering the intake can damage the pistons or piston rings. Damaged pistons or piston rings can cause the engine to make a knocking noise due to increased clearances and reduced compression.
Damaged Bearings: Water in the intake can lead to a lack of lubrication for various bearings in the engine, such as the connecting rod bearings or main bearings. Without proper lubrication, these bearings can become worn out and damaged, resulting in a knocking sound.
Note: It's essential to have the vehicle inspected by a professional mechanic as soon as possible. Continuing to operate a vehicle with a knocking sound can cause significant damage and worsen the condition of the engine.
