4.7.2 Sleeve
Note
A sleeve, which comes into direct contact with the water circulating in the water jacket is called "wet". In this case, the sleeve is securely sealed in the lower bulkhead of the engine block using a copper or rubber ring. Sleeves that are installed in the engine block so that they do not come into direct contact with water are called "dry". During the manufacture of engine blocks with cast sleeves, the sleeve itself is installed in the casting mold even before it is filled with material for the block. After casting the molten metal, diffusion of materials occurs, due to which the sleeve, as it were, is casted into the engine block structure. This is good from an economic point of view, since no money is spent on processing. But it is bad from the point of view of maintainability – in case if any defects of the sleeve are detected, the entire engine block will have to be disposed of.
The upper plane of engine block is carefully processed. A common head, which covers the cylinders from above, is installed on it.
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