Tony-B...
Posted: Mon Mar 31, 2014 7:07pm
Post Subject:
Hot Water
There may be a bleed screw at the highest point on the calorifier coil circuit. If so and if its lower than the engine header tank level try bleeding it from there. If not, and it gets a bit hot and complicated being a twin thermostat Barrus engine, Get the engine up to running temperature with the pressure cap OFF. Mix up a 50% antifreeze mixture with very hot water. Get assistant with mixture in a watering can. Locate the calorifier return hose on the engine, loosen the hose clip and make sure you can move the hose on the stub. Set engine to fast idle (say 1000 RPM). While friend keeps the header tank topped up pull off the hose and use something to plug the ENGINE side so water is pumped out of the hose. If after a short while no air comes out replace the hose and tighten, top up etc. I think that would sort it but if friend adds cold water or the engine is still too cool the first thermostat will not open so nothing would circulate. For a less messy method you could try getting the up to temperature so the hose to the skin tank gets hot and then clamp or crimp the large feed hose to the skin tank. This would force all the engine water pump output through the calorifier coil and there is a good chance it would shift any airlock. Tony Brooks