Had my Lister D up and running today. All of a sudden the water level in the hopper dropped. The water then spurted out from the hopper and the engine stopped. On turning the starting handle there was bubbling sounds from the hopper. Removing the spark plug and them turning the starting handle caused water to gush from the plug hole! I've drained the hopper and squirted oil through the spark plug in the hope of preventing it from rusting up.
Has the copper gasket gone or is the problem more serious please?
Thanks, Ian.