The boat had overheated as soon as we got it on to the diesel point. I checked the water which was below the plate. just thought it had not been checked. filled up with water checked oil and team up with another boater going through the locks by the time we got near the top we were overheating again.
Just before Braunston tunnel two large holes appeared on the side of the header tank. They had obviously been filled in before and painted over.
The boat we locked with tow us through the tunnel and the remaining locks to a boat yard, where a chap named John who is and expert on old engines informed us all the pipes were on the wrong way, there was also a problem with a pump on the engine.
After we got no joy with Wilton we contacted the surveyor who said the boat had overheated when he started the engine but found a inner-tube from a bike around the prop. but after clearing it the engine ran for 20 minutes without overheating. (A load of old bull I think ).
I know people will say its not the marinas responsibility.but they were totally unhelpful. I would like to add i was just helping the purchaser to move the boat to his mooring and do not know whether the engine had been run before. There were many other issues we found on the way once we got the heating problem sorted. I also personally think the purchaser had not done his home work and bought a heap of Poo