ive got a Daihatsu Applause 1990 - A101 model - HD-E 1.6L engine
had water leak and found a crack on the engine block directly behind the catalitic converter pot and decided to use chemweld sealer - has fixed problem for about a year - recently engine randomly and rapidly (10 seconds approximately) overheated with no warning signs - on opening the bonnet the oil and water have mixed and oil has been pressurised out the overflow bottle - the oil sump was millimeters off being completely empty, yet no oil warning light on dash (thats how fast it occured) - car did not stall though and have been able to drive it into garage from street afterwards
how has this much oil gone against the pressure of the water in the radiator, which is much more then the engine???
been thinking that head gasket is unlikely to cause such rapid problem so has the crack broken into the block's water and oil holders and pressure equalised and water pushed oil out??
any opinions or help would be greatly appreciated on this or susgested problem