For example, when cleaning carbon deposits by soaking method, the cleaning fluid is not cleaned up, resulting in the top cylinder of the Mitsubishi Engine when restarting; for Bare Engine equipped with variable intake duct system.

If the cleaning agent flow rate is not properly matched with the speed of the Mitsubishi Engine, it may cause excessive cleaning agent to accumulate in the intake manifold.

When driving at high speed, the intake port becomes a short intake port, and the cleaning agent in the intake manifold is instantly sucked into the combustion chamber, resulting in top cylinder.

Rollover causes connecting rod bending or breaking. After the rollover, the oil in the oil pan flows into the air filter, intake manifold and intake port through the universal pipe of the crankcase.

After the Mitsubishi Engine is started, a large amount of oil is sucked into the combustion chamber. During the compression process of the piston, the pressure on the top of the piston increases because the oil cannot be compressed, and the connecting rod is bent and deformed.

After the user's long-term driving, the connecting rod suddenly fatigues and breaks at high speed. It can be judged whether there is oil in the air filter and abnormal traces of piston ring height by investigating whether there is a rollover accident record.

Damage to the crankcase system causes oil to top the cylinder, resulting in bending or breaking of the connecting rod. For Bare Engine equipped with a variable intake system.

If the ventilation valve of the diaphragm crankcase is broken, a large amount of oil may be continuously sucked into the intake manifold and gradually accumulate. When driving at high speed, the intake port becomes a short intake port, and the oil in the intake manifold is instantly sucked into the combustion chamber, causing the cylinder to top.