:: ENGINE PROBLEM ::

A dry sleeve is a replacement sleeve used to repair damaged bores in blocks. The outer surface of the sleeve makes contact with the machined cylinder block and does not form part of the water jacket. These sleeves are fitted with an interference fit of between 0.05 to 0.1 mm. (.002" to.004"). The sleeve to be used is selected from a range that has the correct inside diameter to allow for re-boring to the piston size after installation, leaving a minimum of 0.75mm (.030") wall thickness. The sleeves are longer than the bores and have to be machined within +3mm of the required finished length. The blocks are stepped bored at the bottom to locate and secure the sleeve position. The trimmed sleeve is pressed or freeze shrunk into position, surfaced level to the block face, re-bored and honed to suit. ( When fitting 1 sleeve only, the adjacent un-sleeved bore may be distorted due to the interference fit so careful measuring and honing is required to eliminate further problems.)