THE BEECHMONT CREST AUTOMOTIVE LEARNING ZONE
CYLINDER SLEEVES
Also called cylinder liners. Cylinder sleeves are tube-shaped metal inserts that fit into the cylinder block. In aluminum engine blocks, cast iron sleeves are most commonly used. There are two types of cylinder sleeves: dry sleeves and wet sleeves.
Dry sleeves fit into a cylinder that have been machined to oversized dimensions, or has become oversized through wear. The sleeve is pressed into the cylinder, then machined to the correct bore diameter.
Wet sleeves are thicker than dry sleeves. They are exposed directly to engine coolants. Wet sleeves are fitted with o-rings to prevent coolant from draining into the crankcase