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I have a westerbeke 58. it had been shutting down after about 1/2 hour of operation time. I had suspected the supply pump or the fuel shutoff solinoid valve, mainly because of the wiring. this last weekend i ran a new wire to the pump and silinoid and the engine ran perfectly so i think my problem is gone. a question i have is that the wiring diagram shows a wire running to a alarm between the water temp and oil pressure switch and also to the alternator to the EXC connection. Could someone give me some insite to how this works or supposed to work or direct me to a diesel manual that would explain it more. My plan as of now is to completely rerun this section of the wiring harness. Thanks for you help.
Howard -
My guess is that the wire from the alternator is used to activate the alarm only when the engine is running. I’d have to see which wire is involved. I use a wire from the tach output to close a relay that supplies power to stuff that should only be on when the engine is running. This could include an alarm, but I don’t have it wired this way. The relay is required because the tach output is only about 6V; is a half-wave rectified signal.
You don’t want to use the tach output to enable your engine alarm if you use a muti-stage regulator with a delayed turn on. In this case, the alarm would only get enabled after the regulator time-out. This is typically a minute or two, more than long enough to cause problems with your engine should the oil pressure be low.
My W60 came with a stock engine alarm. Power to the alarm was gated through a pressure switch on the fuel pump. The alarm would get energized once the fuel pressure built up. This was typically well before the oil pressure built up, so the alarm would sound for a few seconds when the engine was cranked. Guests would frequently step out from their respective corners of the cockpit at the sound and start swinging at each other. I’d have to shut down and restart the engine to get them back in their corners. This drove me nuts, so I replaced it.
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Rich Carter
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Rich,
Obviously our respective onboard guests are from different backgrounds. When I started my old W60 my guests would start looking around for the Ferris Wheel.On Tue, Dec 2, 2008 at 5:05 PM, < ([email][/email])> wrote:
Quote:My guess is that the wire from the alternator is used to activate the alarm only when the engine is running. I'd have to see which wire is involved. I use a wire from the tach output to close a relay that supplies power to stuff that should only be on when the engine is running. This could include an alarm, but I don't have it wired this way. The relay is required because the tach output is only about 6V; is a half-wave rectified signal.You don't want to use the tach output to enable your engine alarm if you use a muti-stage regulator with a delayed turn on. In this case, the alarm would only get enabled after the regulator time-out. This is typically a minute or two, more than long enough to cause problems with your engine should the oil pressure be low.
My W60 came with a stock engine alarm. Power to the alarm was gated through a pressure switch on the fuel pump. The alarm would get energized once the fuel pressure built up. This was typically well before the oil pressure built up, so the alarm would sound for a few seconds when the engine was cranked. Guests would frequently step out from their respective corners of the cockpit at the sound and start swinging at each other. I'd have to shut down and restart the engine to get them back in their corners. This drove me nuts, so I replaced it.
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Rich Carter
Original message
<.. snip>Post generated from Pearson424 Forum using Mail2Forum
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