Originally Posted by Cheechako
are you saying the solenoid and current timer are active only when you run the engine as opposed to shutting it off?
That is correct. Unlike the main Ford Lehman
in my trawler
, which uses a solenoid to stop the fuel flow, the Westerbeke
uses a solenoid to allow fuel flow by applying a voltage to pull in its plunger. I suppose this is because it is designed to run unattended and will shut itself down if any of its sensors (oil pressure, water
temperature) detects a problem. If any of these sensor switches opens it stops the current to the solenoid's hold coil allowing the solenoid's plunger to reappear and stop the fuel.
I used the patent number listed on the current timer to retrieve the patent filing and I think I know the purpose of this part. Without the current timer, you risk burning out the solenoid if you engage the starter for prolonged periods. The current timer will allow current to the solenoid's pull coil for some predetermined period of time, presumably long enough to pull the plunger in but not long enough to overheat the solenoid. The hold coil is energized through the preheat switch while starting and the oil
pressure switch after starting.