After a sleepless night, I rose to check the postings. Then I was off to the dealership for a chatmeup. Went to the tractor(some 70 kms later!), which had sat all night full of coolant. Drained the rad.Wasn't much there.
Drained the oil pan. There was lots! First, the liter of water gushed out, followed by something less than the full required amount of oil.
At least I can say that I'm relieved that my machine didnot suffer some catastrophic failure, and that Mith and JR were on the money: head gasket.
Many thanks to Mith for the manual, and I'm off to pull the head.