|
Wet sleeves have coolant in direct contact with them, and have seals around the base to keep coolant from seeping into the oil. Dry sleeves are installed into a cylinder and do not come into contact with the coolant. Some engines are designed for dry sleved like the older Detroit Diesels, while dry sleeves can be used as a repair for cylinders that are damaged or worn beyond the maximum oversize. Wet sleeves are installed by removing the old sleeves and any O rings from the block at the bottom of the cylinder, sanding the block around the base where the O rings seal, installing the O rings, and sliding the sleeves into place. Dry sleeves, if they are replacements, have to have the original sleeves driven out, which requires a special tool to drive with and a large sledge hammer, then drive the sleeve out, and drive the new sleeve in. If the cylinder has been damaged, like from a loose wrist pin, a crack, or even during a standard boring job, it has been found that the cylinder wall was too thin from a shifted casting core, and the boring bar bores through the wall, the cylinder will have to be bored for a new sleeve. The new sleeve will be driven into place with a large sledge hammer, and a driving tool, the top of the sleeve will have to be cut off to just above the level of the deck, and the deck will need to be resurfaced, then the cylinder will be bored and honed so that it matches the other cylinders. Dennis Benson
|
