Thanks for the welcome and advice!
Liners seemed a bit pricey new but for an extra 100 cowries we could get a full
rebuild kit that includes the liners, new pistons and rings, bearings, front and rear
seals, thrust washers, and full
gasket kit which seemed like a good deal.
The new liners are in and looking much better, especially than the one with the hole in it..
Seems like having isolating switches on your alternator/ starter +ve leads, anodes replaced and adequate
coolant are good things to maintain..