On my Universal M35B (which is a later version Kubota engine, but similar to yours) the preheat button powers up both the glow plugs and the electric fuel lift pump, which supplies fuel to the high pressure injection pump.
When you press the start without preheat, does it crank without starting? Or not crank at all? 1st alternative might indicate a failing lift pump and insufficient fuel supply to the injection pump. Second is probably corrosion in the starter wiring somewhere. Can you here the start solenoid click in if alternative 2? If so, that would make me suspect the power cable to the starter or the engine ground rather than the wiring from the engine panel. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht via CnC-List Sent: Friday, July 31, 2020 12:44 PM To: CnC CnC discussion list <cnc-list@cnc-list.com> Cc: David Knecht <davidakne...@gmail.com> Subject: Re: Stus-List Engine starting issue This is a Universal M4-30. When I bought the boat, I had starting issues and cleaned all the grounds and have since replaced the wiring harnesses. It has been 8 years, but the reason I was skeptical of a ground issue is that the engine has started every time on the first try when first warming the glow plugs. And it has started on the second try both times when not using the glow plugs. Does it make sense that a bad ground would work that way? Dave S/V Aries 1990 C&C 34+ New London, CT On Jul 31, 2020, at 11:35 AM, Dennis C. via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: Yanmar? Don't forget to service the wiring harness connection near the engine, coat contacts with TefGel and then plug and unplug it several times. Generously wrap electrical tape around it when finished. -- Dennis C. Touche' 35-1 #83 Mandeville, LA On Fri, Jul 31, 2020 at 9:44 AM David Knecht via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: Twice in the last week, I have noticed an issue that might be a prelude to a greater problem. Normally, I start the engine by turning on the key, hitting the glow plug button for 30 seconds and then hitting the start button. Never been a problem there. Both times that this has happened, the engine was already warm and I just turned the key on, hit the start button and got no response. Tried again a few seconds later and it started up fine both times. Is it possible that something needs a few seconds to power up after turning the key on (solenoid?)? I don’t remember this being an issue in the past, but it is not often I start the engine by just turning the key and pushing start. My start battery is a 10 year old AGM and has had no trouble cranking the engine in general, even after warming the glow plugs for 45 seconds. Thanks- Dave David Knecht S/V Aries 1990 C&C 34+ _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
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