What Is The Most Common Cylinder Head Problem?

The cylinder head, as a key component of the engine, plays a crucial role in the normal operation of the engine. During use, there may be various issues with the cylinder head that can affect engine performance. Below are some common cylinder head issues introduced to you.

1、 The problem of "three leaks"

（1） Air leakage

Leakage is a common malfunction. Mainly due to poor sealing of the lower end face of the valve or cylinder head, high-pressure gas leaks out of the combustion chamber. For example, carbon deposits, excessive width, or grooves on the sealing surface of the valve seat can damage the sealing effect; Warping and deformation of the cylinder head, as well as damage to the cylinder gasket, can also cause air leakage. Once there is a leak, the engine power decreases, the work efficiency is greatly reduced, and there may be situations such as insufficient power and poor acceleration.

（2） Water leakage

The issue of water leakage should not be underestimated. Violation of diesel engine operating procedures, such as sudden addition of cold water when the engine is hot; Long term overload operation causes the engine to overheat; Failure to drain the cooling water from the cylinder head during winter resulted in water freezing and breaking the cylinder head; Or if the cylinder head material is not qualified and there are sand holes, it may cause water leakage. Water leakage can cause the cooling system to malfunction, affecting engine heat dissipation and leading to other malfunctions.

（3） Oil leakage

Oil leakage usually occurs at the casing or oil pipe joint. Deformation of the casing, damage to the sealing gasket, damage to the oil pipe joint, or unevenness of the gasket can all cause oil leakage. Oil leakage not only wastes engine oil, but may also contaminate the engine compartment and even affect the normal lubrication of certain components, increasing the risk of wear and tear.

2、 Cylinder head crack

The operating temperature of the engine is too high, such as poor heat dissipation caused by cooling system failure, or defects in the manufacturing process of the cylinder head. There are small defects in the material inside, and under long-term thermal and mechanical stress, the cylinder head may crack. Once cracks appear, if not dealt with in a timely manner, they will continue to expand as the engine continues to operate, seriously affecting engine performance and even causing the engine to malfunction.

3、 Cylinder head deformation

During engine operation, excessive pressure from combustion pressure, bolt tightening force, or manufacturing defects can cause deformation of the cylinder head. The deformed cylinder head can cause loose valve closure, insufficient cylinder compression pressure, resulting in difficulty starting the engine, severe shaking during operation, unstable power output, and reduced overall performance and reliability of the engine.