Do you give it a bit of throttle when you cold start? (I know it’s not actually a throttle) Have you adjusted the valves? Have you checked the compression? My 2gm20F was bulletproof but it preferred if I cracked the fuel open a bit when cold. It also was noticeably …. Crisper… when the valves were adjusted correctly and after a good long high rpm run. Dave Sent from my iPhone
> On Jun 6, 2025, at 8:59 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 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://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
