Maybe one or two blades of the pump's impeller are worn off so that the pump supplies enough cooling water up to a point. I would check the impeller next.
Bob Boyer S/V Rainy Days / Annapolis MD 1983 C&C Landfall 38 - Hull #230 email: dainyr...@icloud.com blog: dainyrays.blogspot.com "There is nothing--absolutely nothing--half so much worth doing as simply messing about in boats." --Kenneth Grahame > On May 4, 2015, at 9:19 PM, Tom Buscaglia via CnC-List > <cnc-list@cnc-list.com> wrote: > > We did a run last weekend to a local harbor for the weekend. Wind was fluky > and it was a short trip so we were motoring. Alera has a Yanmar 3HM35 with > around 700 original hours and was running fine at our usual cruising RPM of > 26-2800 on the tach. The hot alarm went off and I let her cool down and then > ran at a lower ROM (1800 or so) and no more alarms. When I got to our > destination, I cleaned out the raw water trap as it was pretty crapped up. > On the way back the alarm went off again but this time all I had to do was > throttle back to around 2200 and it was fine. Much less steam/smoke that on > the way out. > > Today I checked the fan belt on the pump and it was a little loose so I > tightened that. I'll be getting her hauled next week for a pressure wash, > prop grease and zinc replacement, and will check the intake then. > > Aside from the intake, belt and crap trap, anything else I should check? > > Tom B > Tom Buscaglia > SV Alera > 1990 C&C 37+/40 > Vashon Island WA > (206) 463-9200 > www.sv-alera.com > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the bottom > of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >
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