The described problem sounds very similar to that on our 3GM30F. We have gone through 4 full tanks of fuel this year so it is not stale fuel The fuel lift pump was replaced in the fall. The racor filter was changed as was the engine fuel filter The Injector pump was rebuilt in the Spring
When starting in colder weather (and I seem to recall in wet weather sometimes) it cranks longer and then it seems two cylinders catch before the third. Runs flawlessly one it starts. When it starts after a long crank an initial cloud of black smoke comes out and then all is fine. When a warm start it fires up instantly My mechanic calls that “old yanmar” and says it is normal. It is our intention to remove all three injectors this fall and have them rebuilt as well For priming we have installed a fuel squeeze blub before the lift pump and after the Racor. Really hastens the bleeding process Mike Persistence 1987 Frers 33 Halifax, NS From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of sender via CnC-List Sent: Thursday, October 06, 2016 12:19 PM To: cnc-list@cnc-list.com Cc: sender Subject: Re: Stus-List yanmar diesel I think the tank cleaning and fresh fuel should be done regardless. I did that, it helped, the old fuel was the color of weak coffee, the new was nearly clear. On the other hand, a clogged exhaust elbow (or any other restriction in the exhaust) will result in a loss of power under load and a lot more black smoke. Since you said it runs clean when it finally does start I don't think that's your problem. On Thu, Oct 6, 2016 at 5:10 AM, Frank via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Michael , Before you start tearing things apart, check to see that your fuel feed line from the tank to the fuel pump is not obstructed. There is usually a small screen on the end of the line that terminates in the tank that clogs up and can restrict fuel flow from the tank to the pump. This is a common problem usually solved by blowing air through the line from the pump end back into the tank. I had a similar problem and fortunately someone on the list suggested this procedure to me. It worked. Good luck Frank S/V Cool Change C&C 38LF, S/N: 001 Rose City Yacht Club Portland, Oregon From: Michael Jones via CnC-List Sent: Wednesday, October 5, 2016 6:18 PM To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com> Cc: Michael Jones ; Tristan Jones Subject: Stus-List yanmar diesel Hello experts, I wonder if you can help me with any suggestions. I have a C&C34 with a 3GM30 F. This motor runs well and smoothly, water circulates, no smoke. Recently it has been taking more and more revolutions to get it started. When it is turning over there does not appear to be anything going on, but when it starts its immediately smooth and normal (no coughing and spluttering). This leads me to think that there must be a leak in the fuel system which is allowing the fuel to drain back out of the injectors. The fact that it seems to start with all 3 cylinders suggests that the leak is before the injector pump. I cannot see any fuel leaking out at the supply pump or filter, so I'm wondering if anyone can suggest where I should start looking? Or what might cause this and not show fuel leaking or spraying out? I'd like to introduce some method into my troubleshooting! Thanks and regards Mike Jones c&C34 Seanachai Oak Bay, Victoria. On Sep 25, 2016, at 6:09 AM, Dave S via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Good morning all. Several weeks back there was a discussion surrounding issues with bulging keel castings in colder climates. Been meaning to post some photos I took awhile back, here they are: http://cncwindstar.blogspot.ca/ Dave 33-2 Windstar _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated! ________________________________ _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
_______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
