The rubber hose from the shaft log to the stuffing box gets stiff with age (like us humans). A simple cure is to loosen the jubilee clips and pour boiling water gently over the rubber hose until it softens, then while the hose is still warm tighten up the jubilee clips again.that should cure it.
You MUST make sure your bilge pump
is working before undertaking this task and have someone standing by to help.
Personally I changed the old stuffing box on my boat for a PSS shaft seal
and would highly recommend them.
I changed mine while the boat was in the water with no problem but unless your an engineer
, either ground the boat if you are familiar with the underwater layout while you change the shaft log, or, if in the slightest doubt ask the marina to lift
the boat in the slings for an hour while they go to lunch.