Perkins 318 Knock

Don't send that engine out. You can pull the old sleeves and install new ones yourself. You can make a puller out of a length of threaded rod and some scrap metal. You will need a welder and a drill. You will also need a local machine shop.

Step one: Go to your local machine shop and have them make a stepped disc about .010 less in diameter than your cylinder out of good thick stock(you can take one of the new sleeves to the shop and let them use it for a template). Have them drill a hole exactly in the center of the disc of the same size as the threaded rod you will be using (at least 5/8").
Step two:
Take three short pieces of flat iron say about 5 or 6 inches long of good thick stock (1/2" will work good). Two of the pieces are the "legs" that stand against the top of the block and one piece will be the crossbar that sits over the cylinder. Drill a hole in the center of the cross bar the same size as the hole in your disc.

Step three: You put a length of threaded rod through this hole. The rod needs to long enough to reach to the bottom of the cylinder and still stick up above the hole in the crossbar. The disc fits in the bottom of the cylinder. Then you put a nut on the threaded rod to hold the disc in place in the cylinder. Another nut gets threaded on the other end.
Step four: You just turn the top nut in against the crossbar and the disc comes up pulling the old sleeve with it. Once in a great while a sleeve doesn't want to come. Then you will need to take a welder and CAREFULLY run a bead or two on the inside of the old sleeve to shrink it.
When installing the new sleeves put them in a freezer overnight and test fit them into the cylinder. They should slide easily part of the way down, the last part needs to be hammered in so they fit tight. Use a block of wood or similar SOFT material to hammer them in. Sorry for the long post, couldn't think of a shorter way to describe the process.