What Are the Reasons for Low Cylinder Pressure?
1 Answers
The main reasons for low cylinder pressure are as follows: 1. Excessive wear of the cylinder or piston rings, as well as misalignment, sticking, or breakage of piston rings, leading to insufficient cylinder pressure. Piston rings exposed to high temperatures for extended periods may lose their elasticity, failing to seal the piston properly, which also results in low cylinder pressure. 2. Damage or poor sealing of the cylinder gasket, causing insufficient cylinder pressure. The cylinder head and block are connected by the cylinder gasket. If the gasket between adjacent cylinders is damaged, it can lead to gas leakage between the cylinders, resulting in low pressure in both adjacent cylinders. 3. Warping of the cylinder head's lower surface, leading to insufficient cylinder pressure. High engine coolant temperatures can cause the cylinder head to deform, losing its flatness and compromising the cylinder seal. This will manifest as low pressure when measuring cylinder pressure. The majority of cases involving low cylinder pressure in all or most cylinders are due to this reason. 4. Improper sealing of the intake and exhaust valves, resulting in insufficient cylinder pressure. Factors such as valve cone surface erosion, bent or broken valves, or incorrect valve clearance adjustment can all lead to poor cylinder sealing and low cylinder pressure.
