Yes, the company that marinized them picked the color. Don't forget Stewart and Stephens DD's had westerbeke red paint. Silver was J+T, I think...
and put 3' 6x6" blocks under your rub rail a little bit where the front slings go. On a 1987 63' Ocean SF that I managed, if we didn't it would...
They were and they're old, antiquated, dangerous junk that should be replaced. When they hiccup they stay at whatever throttle and gear setting...
Aside from what Capt Ralph has said, it can also be the hose between seacock/strainer/or pump is collapsing shut, or sucking air from somewhere....
You should just break the bank apart every 6 months and shuffle them around and the bank will last longer. :D:D:D:D:D