Bare Engine have high requirements for dimensional accuracy, shape accuracy and position accuracy, but poor rigidity and easy deformation.

The main processing surfaces of Bare Engine include large and small head holes, two end faces, the connection surface between the MG Roewe Maxus Engine cover and the MG Roewe maxus engine body, and bolts.

Secondary surfaces include oil holes, lock grooves, etc. There are also processes such as weighing, inspection, cleaning, and burr removal.

Bare Engine are die forgings, and the processing allowance of the holes is large, and residual stress is easily generated during cutting. Therefore, when arranging the process, the coarse and fine processing processes of the main surfaces should be separated.

In this way, the deformation caused by coarse and fine processing can be corrected in semi-fine processing. The deformation caused by semi-fine processing should be corrected first.