Chapter 2 Crank-connecting rod mechanism and parts Section 1 Engine body group (2)Cylinder jacket Water-cooled internal combustion engine cylinder jacket has wet and dry-wet cylinder jacket. Wet cylinder jacket extine contacts directly with the cooling water,which can achieve good heat dissipation,uniform cooling,easily processed,and easy assembly. jacket thickness 5-9 mm. Dry cylinder jacket extine does not contact directly with the cooling water.Heat dissipation is poor,the outer circle of cylinder jacket and the inner hole of the cylinder block must be finishing,and assembly is not convenient.However,the structure is compact,tightness is good,and intensity and stiffness of the body are very high after dry cylinder jacket is loaded.jacket thickness 1-3 mm. 械电子工程学 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Chapter 2 Crank-connecting rod mechanism and parts Wet cylinder jacket extine contacts directly with the cooling water, which can achieve good heat dissipation, uniform cooling, easily processed, and easy assembly. jacket thickness 5-9 mm. Dry cylinder jacket extine does not contact directly with the cooling water. Heat dissipation is poor, the outer circle of cylinder jacket and the inner hole of the cylinder block must be finishing, and assembly is not convenient. However, the structure is compact , tightness is good, and intensity and stiffness of the body are very high after dry cylinder jacket is loaded.jacket thickness 1-3 mm. (2) Cylinder jacket Water-cooled internal combustion engine cylinder jacket has wet and dry-wet cylinder jacket. Section 1 Engine body group