Hi All,
I recently purchased an old, 1985/87, SpaceSailer 27 with a raw water cooled Volvo Penta 2002 (2 cylinder diesel) and 120 SB sail drive.

I've an overheating issue and wish to inspect the raw water inlet that comes from the sail drive but the original inlet valve/seacock, on the sail drive is corroded open. As it's probably a globe valve, with the inlet and outlet at 90 degrees to each other it's not great as it will tend to block easily. I noted a dribble of water from the raw water pump when I checked the impeller with the corroded valve open.

Anyway, I was wondering if anyone knows what sort of thread the original valve screws into, is it a common BSP, NPT or some uncommon thread? I was hoping to have a ball valve with appropriate fittings ready to screw in when I remove the old original and inspect the internal passages.

The previous owners had extensive work on the cooling system of the engine that I've verified but as this has mainly been a Perth Swan river racer I need to check a bit further "upstream". Interestingly one of the SS27s I inspected had abandoned the raw water supply from the sail drive and converted to a through hull, also a river boat.

Thanks to anyone who may know such a specific bit of tech info.