Water enters the cylinder (combustion chamber) of an Bare Engine, causing the Bare Engine to bend or break. When the vehicle is flooded on the road, the Bare Engine will suck water into the cylinder.

The water that initially enters the cylinder quickly forms hydrated gas under the action of the high temperature of the cylinder body, making it impossible for the cylinder to form a combustible mixture. As the amount of water inflow increases, water will accumulate on the top of the piston, thereby reducing the effective volume of the combustion chamber, increasing the compression resistance, and increasing the pressure of the piston on the connecting rod.

When the amount of water accumulation reaches a certain level, the compression stroke actually becomes the compression of water, and the pressure on the connecting rod increases sharply, resulting in bending deformation until fracture, and even rupture of the Bare Engine cylinder body. Since the pressure on the connecting rod depends on the amount of water inflow into the Cummins Engine cylinder and the speed of the Cummins Engine, not all vehicles will break immediately after the Bare Engine cylinder is flooded.