A common problem on our Westerbeke model is restricted coolant flow due to debris in the internal cooling system. Specifically degrading pieces of the heat exchanger's zinc collect over time in a joint, gradually reducing flow. Backwashing the system solves the problem.
I once debugged a cooling problem to the situation that the mechanic who winterized the system somehow sucked up the little cardboard cap from an antifreeze jug into the cooling system. An hour or so underway in the next season, the little cap found a bend and blocked the system.
I once debugged a cooling problem to the situation that the mechanic who winterized the system somehow sucked up the little cardboard cap from an antifreeze jug into the cooling system. An hour or so underway in the next season, the little cap found a bend and blocked the system.