Its obvious that neither of these firms has ever been inside a 23c! The liners are a drop in fit, held in place by the head, quite thick and of course finished size as they are not a press fit. No amount of shims will stop gas leakage down the outside if the gasket is not sitting on the top of the liner, In the case I mentioned, the liners had been bouncing off the head, having the thickness of the gasket as free play, and so moving with the pistons!
The main reason for firms avoiding finished liners is the extra charge they can make for carrying out unwanted machining, and as they are thicker, less care is required in fitting.
The hardest wearing liner has to be fitted prefinished, as it cant be machined.
The main reason for firms avoiding finished liners is the extra charge they can make for carrying out unwanted machining, and as they are thicker, less care is required in fitting.
The hardest wearing liner has to be fitted prefinished, as it cant be machined.