Re: SM galley Faucet very hot.
One last idea, regardless:toggle quoted messageShow quoted text
If you have the original Amel faucet mechanism (which I assume is similar to that on our boat), I would replace it no matter what the problem turns out to be. Our faucet was very simple, a hot/cold mixing control, and the rigid faucet. I replaced it with a more modern faucet, which has two extra features: a switch to select either regular flow or spray, and an inner hose extension which allows the faucet to be pulled out of its base.
Both of these features greatly enhance dish washing, and reduce water usage.
SM 240 Aletes