Black powder, rubber smell and charge light point to a loose or defective drive belt. Could be a rusty engine drive pulley causing the belt to wear. Not unusual in a boat.
The running problems, vibration, low rpm etc. could be a fouled prop. Plastic bag, line or mussels. At least have a close look at the prop and strut. Rich (mobile) On 2012-08-20, at 12:34, Sébastien Lemieux <s.lemi...@umontreal.ca> wrote: Just my 2 cents, but if you have a folding prop it might be a good idea to check that the two blades are freely moving. This could explain the vibration + loss of speed, but not the low RPM. For the rubber smelling material in the bilge, I am currently having a similar issue. In my case, it is due to heavily deteriorated sound insulation material in the engine compartment (the black rubber foam literally falls off and gets carried to the bilge, resulting in a fine black powder). I've been delaying the moment of ripping off this lining to change it since last year and been wondering if that powder could be slowly causing other damage, such as clogging the air filter... Good luck, Sebastien Merlot X - 30-2 On Aug 20, 2012, at 10:35, Colin Kilgour wrote: > 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 > > _______________________________________________ > 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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