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Old 07-31-2015, 01:05 AM   #1
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Westerbeke Slowly Dying

I have an 8k Westerbeke generator on my new to me boat. It starts and runs fine for about 5 minutes, then slowly starts to die. It will not start back up right away, but will after a few minutes. I've changed the raycor and fuel filter on the genny. It really seems like a lack of fuel, but I'm not sure where else to look besides the two filters. Anyone have and solved a similar issue?

Thanks for any thoughts or suggestions.
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Old 07-31-2015, 01:42 AM   #2
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My failure (like that one) was a bad fuel pump. Bought an aftermarket pump (Walbro), installed and it ran fine after that.
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Old 07-31-2015, 02:10 AM   #3
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Update: I can keep it running by manually pushing the throttle. Still thinking fuel pump?
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Old 07-31-2015, 02:19 AM   #4
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Air in fuel supply line?
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Old 07-31-2015, 02:41 AM   #5
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Correction: I held open the fuel run solenoid, which seems to act like a throttle, but I'm learning as I go tonight.
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Old 07-31-2015, 03:44 AM   #6
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Correction: I held open the fuel run solenoid, which seems to act like a throttle, but I'm learning as I go tonight.
That`s new info, is it not holding in?
On an Onan, the solenoid has 2 "holds", the initial one to zap it across, and a second less powerful one to hold it there until shutdown. It shouldn`t operate as a throttle, it should be on, or off. If playing with it achieves something that is not happening, suspect the solenoid.
[Retired lawyers give really good mechanical advice, not. It`s just I`ve been through solenoid issues.]
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Old 07-31-2015, 03:52 AM   #7
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Sounds like a weak solenoid . Had to replace mine .
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Old 07-31-2015, 07:12 AM   #8
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Pack Mule, do you happen to know if Dover Marine or someone else in the area carries those? We are picking up a Paris Landing buddy this afternoon on Lake Barkley and he may be able to grab us a spare.
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Old 07-31-2015, 08:17 AM   #9
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12 volt solenoids come in at least 2 mounting options, one with a wings coming out each side of the cylinder and one with a right angled mounting plates. Westerbekes take the winged mounting. Over the years I have been shipped the wrong mounting plate. Not a problem for me as my Yanmar uses the right angled mounting plate
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Old 07-31-2015, 10:25 AM   #10
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Pack Mule, do you happen to know if Dover Marine or someone else in the area carries those? We are picking up a Paris Landing buddy this afternoon on Lake Barkley and he may be able to grab us a spare.
No not sure . Sometimes you can take them apart, clean and put back together for some more life . I ordered mine from deisel specialist out of Baton Rouge .
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Old 07-31-2015, 10:46 AM   #11
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For the record, there is no "throttle" on a Diesel engine, only a fuel control lever.
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Old 07-31-2015, 11:29 AM   #12
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So does the solenoid/lever release as it bogs down, or does the lever stay put until it stalls? Big difference in troubleshooting.
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Old 07-31-2015, 03:26 PM   #13
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For the record, there is no "throttle" on a Diesel engine, only a fuel control lever.

throt·tle
ˈTHrädl/
noun
noun: throttle; plural noun: throttles
  1. 1.
    a device controlling the flow of fuel or power to an engine.




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Old 07-31-2015, 04:42 PM   #14
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The throttle controls the air flow and the fuel flow is controlled by the air flow. That's how gas engines work.
Diesel engine's intake is a pipe with no moving restrictions, only a control that adjusts the injection pump and allows more or less fuel. Ergo bingo, no throttle on a Diesel engine.
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Old 07-31-2015, 04:50 PM   #15
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Read the definition: "a device controlling the flow of fuel ". Or have somebody read it to you.
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Old 07-31-2015, 06:51 PM   #16
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Who ever wrote that definition is not likely an engineer, and it is an engineering term. "Throttle" originated to control steam engines, a valve in the steam admission line. Close or choke down the throttle, and it reduces power output of the steam engine.

Next came gasoline engines, and the throttle controlled the flow of air/fuel mix. Similar to steam engine, valve closes down on the admission flow.

Throttle a screaming kid, slows them down too. Not considered polite nowadays!!! Again, restricting admission flow, this time it is air.

Diesels are different. No throttling going on. Lever is "speed control lever" or "governor control lever" or "power control lever" or "fuel control lever" or a bunch of others. But those are too many words, too inconvenient.

Throttle in regards to diesels is technically incorrect, but it is widely used and even accepted amongst engineers.

But engineers sitting around the table discussing a governor design, no one will say "throttle".

Kind of like the "motor" and "engine" debate!!!
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Old 07-31-2015, 10:43 PM   #17
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Second part of the definition: "controlling the flow of fuel or power to an engine". In a gas engine the throttle controls the air flow, in a diesel engine the "throttle" controls the fuel flow, in a steam engine it controls the steam flow. Same difference, they all control the power.


I guess I didn't realize this was a forum for engineers, although I was one before deciding software was an easier way to make money, no obvious jumpers on a circuit board. But I have spent a fair amount of time in engine rooms of steam powered ships so I do know what a throttle really is. I guess that really dates me, doesn't it.
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Old 08-01-2015, 08:08 AM   #18
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Disconnect the wires to the solenoid. Then run wires directly from your battery terminals to the solenoid terminals, positive to positive and negative to negative. When you complete the connection, the solenoid plunger should snap in and stay there. If it doesn't the solenoid is bad and you have a different problem. Check all connections to temp and oil pressure sensors. If that doesn't solve it, the circuit board is suspect. Good luck, Howard
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Old 08-01-2015, 09:22 AM   #19
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Thanks Howard, I'll run that test today. I found a used spare in the box 'o parts, so i'll test both and see how it goes.

Just so I'm clear, it should only be open or closed, right?
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Old 08-01-2015, 09:25 AM   #20
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Right.
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