A slight deformation and bending of an Bare Engine will cause the Bare Engine to fail to start. After the Bare Engine is started, the idle speed is unstable, it shakes violently, and there is a knocking sound. Secondly, use professional tools for measurement, which requires testing in a repair shop.

1. Water inflow into the cylinder of an Bare Engine: As the amount of water inflow increases, water will accumulate on the top of the piston, reducing the effective volume of the combustion chamber, increasing the compression resistance, and increasing the pressure transmitted to the connecting rod by the piston.

2. Abnormal injection system of MG Roewe Maxus Engine: The cause of this situation is usually a certain component of the Bare Engine. It is caused by the worker's injector continuously spraying oil. Usually there will be difficulties in starting before. Rapid shaking, black smoke from the exhaust pipe, and power reduction.

3. Connecting rod and crankshaft locking: This situation is generally caused by poor lubrication of MG Roewe maxus engine, which can be judged by checking the wear of internal components of MG Roewe Maxus Engine.

4. There is a problem with the connecting rod itself: In this case, the chemical composition analysis and hardness test of the connecting rod material can generally be determined by inspecting the metallographic structure and scanning electron microscope fracture analysis.