If you're not getting to max rpms, there could be a number of issues: 1. Fuel filters clogged and need replacing 2. Injectors clogged and need servicing / replacing 3. Air filter - already noted 4. Elbow clogged 5. Someone monkeyed with the throttle adjustment?
As for the knock - it's possible that your shaft is misaligned. I would check the alignment. Getting new engine mounts, won't solve the problem (although the process if installing new mounts would necessarily involve fixing any alignment issues) Charging issues - I'll leave to Fred and Rich and the rest of the electricians... On Mon, Aug 20, 2012 at 10:16 AM, Indigo <ind...@thethomsons.us> wrote: > 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 >
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