1. Low Oil Pressure: High-speed driving can put a strain on the engine and cause low oil pressure. This can lead to insufficient lubrication of the camshaft and its components, resulting in a knocking noise. Check the oil level and quality to ensure it meets the manufacturer's recommendations.
2. Faulty Hydraulic Lifters: Hydraulic lifters are responsible for adjusting the clearance between the camshaft and the valves. If they become worn, damaged, or clogged, they may not be able to do their job properly, causing a knocking noise.
3. Camshaft and Bearing Failure: In severe cases, the camshaft and its bearing may be damaged, leading to excessive play and knocking noise. This can happen due to excessive wear and tear, lack of lubrication, or a manufacturing defect.
4. Damaged Piston or Piston Ring: A damaged piston or piston ring can cause knocking noises, especially when the engine is under load. This is because the piston or ring may be damaged, causing excessive clearance or improper combustion, resulting in a knocking noise.
5. Worn Connecting Rod Bearings: Connecting rod bearings connect the piston to the crankshaft. If these bearings are worn or damaged, they can cause a knocking noise as the piston moves up and down in the cylinder.
To accurately identify the source of the knocking noise, it is recommended to take the vehicle to a qualified mechanic for inspection and diagnosis. They will be able to pinpoint the exact cause and provide the necessary repairs or replacements.
