While returning home yesterday arvo my starboard engine suddenly stopped, I was going at about 3,000rpm. So came home on one motor, Today I have a look and no coolant engine oil looked between the 2 marks on the dipstick., I had no coolant so put water in the reservoir , but.. all of the water appears to now be in the sump with the oil, there was also a "gluging" sound as the reservoir drained very quickly., I am in Papua New Guinea so no service or dealers here anymore... I thought of the head gasket, but it seemed to drain to fast. I had noticed that the oil pressure gauge was a little l9wer on that motor the last couple of runs, but not dramatically so....Any thoughts would be greatly appreciated