What is the troubleshooting method for low cylinder pressure?

[LeBrooklyn]

The troubleshooting method is as follows: if the pressure in all cylinders is generally lower than the specified value, it may be due to valve leakage in all cylinders, cylinder wear, excessive piston-to-cylinder clearance, piston ring wear, or other sealing issues; if the pressure in an individual cylinder is too low, it may be caused by valve erosion in that cylinder or cylinder gasket erosion damage leading to leakage. The main reasons for low cylinder pressure are the following three points: 1. Excessive piston ring side clearance and end gap: Excessive piston ring side clearance and end gap, shortened gas passage, or wear of the first sealing surface of the piston ring, resulting in poor sealing; 2. Excessive wear between the piston and cylinder: Excessive wear between the piston and cylinder increases the piston-to-cylinder clearance, causing the piston to wobble during movement in the cylinder, affecting the proper sealing between the piston ring and the cylinder; 3. Piston ring sticking or carbon buildup: Piston rings stuck in the ring groove due to sticking or carbon buildup prevent the ring's natural elasticity from functioning, losing the first sealing surface between the compression ring and the cylinder wall.