ut oh

[mrfrost]

hello fellas
bad news
thought i broke a ring but...........
think there is a small crack in the cylinder wall
have been told it it has been bored 40 over already
is there such a thing as putting a sleeve in there
or what do you all suggest
anyone have a good revolver?
just kidding

[Daniel H.]

You can bore up to .060 over. You can also have dry sleeves made for the motor, but I don't have any experience with those, I just know it is possible.

[jim turner]

it can be sleeved but since it has been bored already you will have to check and see if a sleeve is available for that much overbore, your machine shop will know

[Bus Driver]

If the pistons and the other cylinder walls are in good condition, I probably would sleeve the bad cylinder and bore it to 0.040 oversize. That might be lower cost than boring all and buying a full set of new pistons. Chrysler Corp in the late 1940's and early 1950's salvaged (new) bad engine blocks on the production line by boring just one cylinder, or more if necessary, to oversize and assembling the engine that way. The block was marked with a code that dealership mechanics could decipher telling which cylinders were oversize. New crankshafts could have one of more journals 0.010 undersize too. My point is that the Cub has low compression, low speed engine. For example, if the bad cylinder could be sleeved and bored to only 0.020 oversize, leaving the others at 0.040, it probably would not cause a significant problem.