On my 3GMf (20hp) I have to increase the throttle a little in order for the engine to start. It hasn't been a big deal, so I haven't looked into the cause. It didn't do this when I first got the boat (25 years ago). I replaced the fuel line some time ago, and I'm wondering whether I didn't tighten it enough, so that the fuel might be flowing back into the tank when the engine hasn't run for a while. With the fuel line empty, it would take some cranking for the fuel to come back. I'll check the connections the next time I'm at the boat. I'll also check the air filter as recommended in Meredith Anderson's article in Practical Sailor.
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR On Sat, Jun 7, 2025 at 12:02 PM Richard Arper via CnC-List < cnc-list@cnc-list.com> wrote: > I’ve tried every imaginable throttle position, and yes, full seems to work > best as the manual suggests. > > I read somewhere that when the throttle is in the full position, it > actually retards the injection pump to assist in starting. > > > > Richard Arper > > rtar...@wavecable.com > > > > *From:* Dreuge [mailto:dre...@gmail.com] > *Sent:* Saturday, June 7, 2025 6:39 AM > *To:* cnc-list@cnc-list.com > *Cc:* Richard Arper > *Subject:* Re: Stus-List Yanmar 3GM30F starting > > > > Are you putting the throttle to full when cold starting. This works well > for my 3QM30 even when it gets down to freezing temperatures. > > > > - > Paul E. > > 1981 C&C Landfall 38 > S/V Johanna Rose > Fort Walton Beach, FL > > > > http://svjohannarose.blogspot.com/ > <https://urldefense.com/v3/__http://svjohannarose.blogspot.com/__;!!LIr3w8kk_Xxm!vqxhu0dMbxFwp5ytYVFTXCdV8XMWLnAa5sU6306QZACasc9Sxs2Um1XJbSvleeUgQ5ZORkyeQMwz23bzKvKxEpY$> > > > > On Jun 6, 2025, at 8:58 PM, Richard Arper via CnC-List < > cnc-list@cnc-list.com> wrote: > > > > This issue may have been discussed previously before I joined the group, > but I wanted to throw it out there. > I have a 34+ with a Yanmar 3GM30F and its terrible to start when the > temperature is maybe 50-60 degrees or less. > That's a problem in Puget Sound where we sail all year. > Once started, however, it starts perfectly all day after that with just a > couple turns. > > I've read online about others having the same problem and offering > starting procedures such as turning over with compression levers open to > lubricate, then turn over with no fuel to heat up the chambers. > There's even an air preheater that tractors use. > But this doesn't solve the problem, and it's to the point where I'm ready > to rebuild or repower. > > However, what's the root of the problem? Is it poor compression? (engine > only has 1600 hrs.) > Is it bad injectors? Other issues? Trait of this particular engine? > > My 34 had a 2QM20 that started flawlessly under any conditions, so I know > that it's not a lack of glow plugs. > > Richard Arper > rtar...@wavecable.com > C&C 34+ > Your contributions help pay the fees associated with this list and help to > keep it active. Please help by making a small contribution using PayPal > at: https://www.paypal.com/paypalme/stumurray > <https://urldefense.com/v3/__https://www.paypal.com/paypalme/stumurray__;!!LIr3w8kk_Xxm!vqxhu0dMbxFwp5ytYVFTXCdV8XMWLnAa5sU6306QZACasc9Sxs2Um1XJbSvleeUgQ5ZORkyeQMwz23bzeG8Ri38$> > All contributions are greatly appreciated. > > > Your contributions help pay the fees associated with this list and help to > keep it active. Please help by making a small contribution using PayPal > at: > https://urldefense.com/v3/__https://www.paypal.com/paypalme/stumurray__;!!LIr3w8kk_Xxm!vqxhu0dMbxFwp5ytYVFTXCdV8XMWLnAa5sU6306QZACasc9Sxs2Um1XJbSvleeUgQ5ZORkyeQMwz23bzeG8Ri38$ > All contributions are greatly appreciated. >
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