90% of the time, overheating on a yanmar is due to restriction in the exhaust where the water get injected after the manifold. Usually it connects to a rubber bellows/hose that can be easily taken out. Then poke into the exhaust with a large screwdriver and see if you see flakes of carbon Ahmet Winthrop, MA
On Mon, May 30, 2016 at 10:57 PM, Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote: > If it was really fouled then he probably would have noticed that it wasn't > achieving the same thrust to RPM or speed to rpm ratio. This usually is > also accompanied by black smoke indicating too much engine load. > > I have not heard any reports regarding the condition of the impeller. I > have also not heard anything about the intake side of the heat exchanger. > I'd definitely be checking both of those. Also the belt on the impeller > can be difficult to get tight enough to prevent slipping. > > You might consider using a garden hose to lightly pressurize the raw water > system. You could even do it by shoving the hose up the through-hull from > outside. (you'll need the dive gear again) Then with the boat securely > tied, load up the engine. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > On May 30, 2016 10:25 PM, "Tim Goodyear via CnC-List" < > cnc-list@cnc-list.com> wrote: > > The 3HM35 has a continuous rating of 3200 rpm with a 1-hour rating higher > than that, so it is probably worth continuing the hunt for issues (maybe > around the exhaust water injection?). A properly functioning engine should > not overheat with load from a few barnacles, should it, or was it really > fouled? > > > > On May 30, 2016, at 10:14 PM, Tom Buscaglia via CnC-List < > cnc-list@cnc-list.com> wrote: > > > > I borrowed a wet suit and regulator from a fellow club member and drove > the boat (first time!). Barnacles on prop and shaft came offsite a chisel > followed by a wire brush. Aside from poking a wire coat hanger in the > water intake to the mixing elbo, everything else was the same as those way > there. > > > > We ran all the way back at around 2500 RPM without issue. > > > > Guess a crapped up prop can result in overheating problems...Go figure. > > > > Tom Buscaglia > > S/V Alera > > 1990 C&C 37+/40 > > Vashon WA > > P 206.463.9200 > > > > > > > > _______________________________________________ > > > > 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! > >
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