Bitzer 4VC Piston Manufacturers china tells you the maintenance instructions of the cylinder liner piston assembly.
When installing the cylinder liner, special tools must be used to press it smoothly, and hard knocking or rough installation is not allowed, so as to avoid deformation of the cylinder liner and damage to related parts.
The amount of protrusion between the cylinder liner and the plane of the machine body must not exceed the specified value, and the excessively protruding cylinder liner is easy to be crushed by the cylinder head and drop the shoulder. If the plane between the cylinder liner and the body is too low, it is easy to cause the cylinder head gasket to leak.

The deformed body should be repaired or replaced, and the deformed connecting rod or damaged connecting rod bushing should be replaced.
The front and rear ends of the piston are distinguished, the piston ring cannot be installed reversely, and the upper and lower rings are distinguished. Generally, the piston ring is installed with the marked side facing the top of the piston. The compression clearance of the piston and cylinder head should be within the technical requirements of the model (generally kept above 0.30mm, except for micro engines).
When the piston and the piston pin hole are interference or transition fit, for the convenience of installation, the piston oil bath or boiling water can be heated, and after the heat is thoroughly removed, the oiled piston pin is pushed in in time. Pistons should not be heat treated with an open or high flame.
Maintain the free clearance between the piston pin retaining ring and the piston pin to prevent accidents caused by piston pin expansion and damage to the retaining ring.
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