When the belt broke, the piston impact may have lifted the head slightly enough for coolant to pour into the cylinder from the water jacket - or you may have just at that moment developed a water/gasket leak and that stopped the engine.
Sorry Willie, I don't like either of those! I have never seen a belt breakage lift a head although I have seen drag racers blow both off but that is a little different. I do however admit to the possibilityof that, however slight. Also I am no great believer in coincidences either.
Six weeks of what? and where did the orange dust come from in the first place...
Six weeks of standing in the workshop/yard I think. The orange dust could be anything, but being (I understand) as it was on the top of the head I probably is not significant.
From what I can make of it your car was running fine when you parked in the morning.
In the evening it started fine but came to a sickening halt as you tried to back away. The mech had a look and diagnosed cam belt.
Several weeks go by.
You push it into the workshop/garage where the mech starts to change the cambelt and stuff, and finds water in No1 cylinder when he goes to line up the timing marks.
He completes the belt job but there is no compression on two of the cylinders.
So 4 questions need answering.
1: Was it a cambelt problem that caused the engine to stop first of all?
2: Which 2 cylinders have lost compression?
3: Did the mech check for valve damage?
4: Was the car left outside for weeks without the plugs in?
If the cambelt failed then there will almost certainly have been valve damage causing a lack of compression. That will need repairing. If the car was left in the open for weeks without plugs, in the weather we have had recently, it MAY have caused the water in the cylinder problem.
Come on philpot, 'fess up!
We have gone from water in No1 Cylinder to cambelt replacement to no compression on 2 cylinders. Is there anything else we ought to know?