My 2 cents: Tighten the alternator belt and see what your RPMS are. A loose belt on our engine will indicate lower RPMS than actual. Sounds like the bottom needs a good scrub, and barnacles on the prop and shaft are causing the vibration? Sounds like someone dove on the boat to check the prop, but did they spend time and check the keel bottom? One year I found alot of barnacles on the bottom of our keel where the bottom paint was worn off. It was rough like a coral reef. This is the peak time in New Jersey for barnacles.
My son dove under our boat and found barnacles on our prop and shaft and spent an hour cleaning them off and cleaned the bottom. He said some things during the races later that day that indicated he did about 75% of the job. I'm thankfull he did it but there's nothing like seeing for yourself. Chuck Resolute 1990 C&C 34R Atlantic City, NJ ----- Original Message ----- From: "Jack Brennan" <jackbren...@bellsouth.net> To: cnc-list@cnc-list.com Sent: Monday, August 20, 2012 10:32:03 AM Subject: Re: Stus-List Yanmar problem Also, don't forget to check the stop and throttle cables at the engine. I had a loss of power on my 2GM20, and it turned out that the stop mechanism on the engine was gummed up and only opened part way when the stop handle was pushed all of the way down in the cockpit. -----Original Message----- From: Indigo Sent: Monday, August 20, 2012 10:16 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Yanmar problem Inability to increase revs could also be caused by a partially blocked elbow. Jonathan Indigo - 35MkIII Southport CT -----Original Message----- From: cnc-list-boun...@cnc-list.com [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Joel Aronson Sent: Monday, August 20, 2012 7:22 AM To: cnc-list@cnc-list.com Subject: Stus-List Yanmar problem Jackson Loose alternator belt and dirty bottom? Getting black smoke when u try to push the rpms? (changed the subject line) Joel Aronson On Aug 20, 2012, at 7:03 AM, jackson maddux <jackson.mad...@gmail.com> wrote: > We are having some mechanical problems with our Yanmar 2GMF. I am hoping for some advice..... > > First admission: other than changing oil, we have not been too good with our diesel. The boat has also not had much use this summer (about 5x total). > > The hull is scummy, but not encrusted, so we know that the hull is not the whole problem. A few barnacles on the shaft, but nothing more than usual for this time of year. > > The problem: About 2 weeks ago, my boat partner went for a little motor cruise and the boat would not go past about 3 knots (normal for us at 2500 RPM is about 4-5 knots). > > Yesterday, I got on board and the boat would not accelerate nearly as fast as before. The engine would not go past 2800 RPM (3300 is usual for our engine, 3400 is the max rating). The max speed was about 3.5 knots after a friend, who is a mechanic, bled the injectors and told us to get a new air filter. > > He also told us to get a new fuel filter (and a "better" one than we have..racor R12P is the name on the filter). > > The "charge" light goes on when the engine is on, complete with it's associated buzzer noise. However, the light extinguishes if the RPM goes up. We can get the alarm to turn off if we change the switch to "illumination" from the default "on" position. > > Finally: the propeller shaft now has a distinct vibration to it and the negine seems to bounce around more than it did when we bought the boat 2 years ago. The engine mounts look ok to my amateur eyes. However, we do have powdery rubber-smelling material in the bilge. > > The questions: > 1. Bad alternator? > 2. New filters etc would be helpful? > 3. New engine mounts needed? > 4. Anything else that we might be missing before I can a mechanic? > > thanks for any replies. > > -Jackson Maddux > Schiehallion > C&C 32 > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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