I have an old bored cylinder without sleeves. I'm thinking about to put sleeves in, OD 3" (75mm). Bores are now 74 mm and need to be bored almost 1 mm more.
There are thin cast between 1-2 and 3-4. Today hole from 3 to air, almost hole in the other bores and will get more of it when bored 1 mm more. (0.5mm less material)
I'm thinking about the holes as I have read about can happen when bore. Is this normal for most of the cylinders?
The cylinder need to be soda blasted, bored, new sleeves and to be used in next project.
The holes must be sealed? The visible hole now is thru the cylinder and air blow thru it.
Or will sleeves seal with help of additional RTV at the bottom? Counterbore a little at the bottom so a slot of 1mm wide, 5-10mm deep between cyl and sleeves and to be filled with sealer like Permatex Ultra grey.
The holes must be sealed from outside too? Protect against water and dirt to make the sleeve to rust. The oil can only enter from the bottom, right? From top means a leak.
JB Weld thinned with acetone to make it almost fluid for a thin seal, enough so it will seal when sleeve is mounted?
Weld it seems to be complicated?
Or is it better to find another cylinder? Which year is better except for rare K0? I guess most cylinders need to be sealed for 3" sleeves.
