What distinguishes a wet sleeve from a dry sleeve in a diesel engine?
Wet sleeve is surrounded by coolant, dry sleeve is not
Cylinder liners (sleeves) are classified by how they contact the engine coolant.
A wet sleeve has its outer surface in direct contact with the circulating coolant in the water jacket, so it is sealed at top and bottom by rings or a flange.
A dry sleeve is pressed into the parent cylinder bore and is separated from the coolant by the surrounding block metal, so no coolant touches it directly.
The other statements (size, plastic material, fixed vs removable) are not the defining difference – both types are metal and can be replaceable.
Hence, the distinguishing feature is that the wet sleeve is surrounded by coolant while the dry sleeve is not.
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