Janz

Thanks, I have just read the maintenence link to your site. I shall try & replumb the calorifier when I know what the hell is going on with the cooling system. It's a steep learning curve, this... normally, if I see water coming from an exhaust pipe, I get scared. Now I'm getting scared if I don't..!

There are two fillers as you described. The header tank one is the supply that is losing water... Thanks 👍I shall regrease it & see if it slows the leak. I have never seen any water coming from the exhaust no matter what the conditions - full, empty, bled or unbled...

Thanks 👍, my boat is old (1981), so that could be likely. It's a BMC 1500 D. I'm heading down now to take pics. I'll give the pump a regrease whilst there & report back asap...

Thanks Tony. I will head down there & take some pics. But from memory the header tank runs to a welded in tank which is about 40 litres capacity. A hose exits the bottom of the tank & runs across the prop shaft to another identical tank on the other side with an air bleed on it. A thick hose then exits, runs along the bulkhead but I haven't looked where that goes...

Wow, thanks for the prompt replies! Excellent... ok, what I don't get is why I have two cooling systems. Why use raw canal water & also have a header tank & two skin tanks?

The belt is also on its last legs, so to get one I need a model name/number. Is it part of the Bowman thing adjacent to the rocker box? Could someone point me to a thread on what that does & its connections? My tub is using a closed cooling system like a car with skin tanks for rads. It's ok for now but if the temperature droms I'm worried it might freeze as I'm just running straight water through it...

Hi guys, What is this? Is it a pump that feeds the calorifier? I have bought a boat with the calorifier disconnected. There are two hoses on it that should be plumbed into the engine but no obvious inlet/exit fittings. This pump must have been disconnected/blanked off as it is leaking, both from the shaft & the gasket. It's also been packed with grease, presumablyto negate the leak but it ain't cutting it. When the engine is running, it starts losing a lot of water & I can't really sort out the rest of the cooling system &/or add antifreeze until it is either watertight or swapped out for something that works. In order to fix it I would need to know brand, model & function. I'm good for air cooled motorbike engines but I don't know much about water cooling stuff such as cars, boats etc... Any ideas?