On our M4-30, the fuel pump is energized when you turn on the switch and stays on until the switch is turned off. The electric fuel pump is a booster pump and we found we could run the engine to half speed without the pump. (Cleaning the ground connection on the fuel pump, brought it back to life) The PO made a change to the factory setup and our starter is energized separately from the Glow Plugs. He simply moved the starter button line wire from the load side of the glow plug button 2" to the line side terminal, so both buttons are hot fed when the switch is on. I like this arrangement because the Glow plugs are only needed when the engine is cold, first start of the day. The starter can be started with one button this way.
Starting sequence: Usually I turn on the switch and listen for the ticking of the fuel pump. I set the shifter to neutral, set throttle to 1/3rd Hold the glow plug button for 30 seconds if it's warm out, or 60 seconds if it's cooler. Push the starter button till she fires off but no more than 10 secs, then adjust throttle down to idle. She usually starts first time. If not, I hold glow plugs longer and try again. I shut down the engine when sailing and never need the glow plugs for starting the rest of the day. Shutdown requires pulling the engine stop cable, turn off the key, and put shifter in reverse. I think the Universal M4-30 is a very robust and reliable engine and the Yanmar is just more popular because of numbers. Chuck Resolute 1990 C&C 34R Broad Creek, Magothy River, Md ----- Original Message ----- From: "Neil Gallagher via CnC-List" <cnc-list@cnc-list.com> To: cnc-list@cnc-list.com Cc: "Neil Gallagher" <njgallag...@optonline.net> Sent: Tuesday, August 11, 2015 8:50:09 AM Subject: Re: Stus-List Universal Engine panel wiring The power to the starter button is supposed to come off the switched terminal of the glow plug button. You are supposed to to have to push the glow plug switch and the starter switch every time you start, as the glow plug switch also powers both the electric fuel pump until the oil pressure builds up, and silences the low oil pressure alarm. Once the oil pressure rises, its switch powers the fuel pump. I put an M30B in our club launch and it has the same setup. Neil Gallagher Weatherly, 35-1 Glen Cove, NY On 8/10/2015 11:15 PM, David Knecht via CnC-List wrote: Since I got my boat, I have been bothered by the fact that the engine will not start in the way it is described in the manual unless plugged into shore power. The manual says to hold the glow plug button for about 30 seconds and then while continuing to hold that button in, push the start button. When I do that, the starter does not turn over. If I release the glow plug button and push the start button the engine starts fine. My father (retired electrical engineer) and I (genetic engineer- useless in this case but sounds good) spent some time trying to diagnose the problem this weekend and found two interesting things: 1. The buttons both tested fine in terms of their switch function. We then tested power at the engine. There is a heavy red cable coming from the battery to the starter measured 12V. The red-yellow wire from the start button is attached to what I am presuming is the solenoid (the wiring diagram in the manual does not show a solenoid). We only measured 8 volts at the solenoid when the button is pushed, but 12 volts everywhere else. So that probably explains the fact that both the glow plugs and starter won’t work at the same time because we appear to be losing 4 volts in the solenoid. I will pull the starter next winter and have someone test it unless someone has an alternative suggestion. 2. The wiring diagram in the manual (Fig 2 on page 13) shows the power from the key switch coming into the glow plug button and then a wire from the other lead to the start button. The manual shows that wire running from the downstream side of the glow plug switch so that the start button should only be energized when the glow plug button is pushed (as the manual describes). If that were the case, the I would not be able to start the engine with only the start button. Nevertheless, it does start the engine. Tracing the wires, we found that the bridging wire actually came from the hot side of the glow plug switch, so that either button will work independently as both are always powered. What I don’t understand is why you would wire it the other way (as the manual shows) since that would remove the ability to start the engine without the glow plugs (as in an already warm engine). I don’t know if the PO or some yard mechanic made that change or if it is indicated wrong in the manual, so I am curious how other Universal panels are wired. The way it is actually wired makes more sense to me than what is in the manual unless I am missing something. Thanks- Dave Aries 1990 C&C 34+ New London, CT _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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