I clean my copper tube heat exchanger with 1/8" diameter wooden dowels bought from an art supply store like Michaels. Once a year. Pipe cleaners would be better, but can't find them anymore.
Chuck Resolute 1990 C&C 34R Broad Creek, Magothy River, Md ----- Original Message ----- From: "svpegasu...@gmail.com via CnC-List" <cnc-list@cnc-list.com> To: cnc-list@cnc-list.com Sent: Tuesday, May 5, 2015 12:51:55 AM Subject: Re: Stus-List Overheating as high RPM only If you have a heat exchanger, that could be getting clogged. Open the end/s and look at the tubes. Sea water flows through these cooling the coolant. Over time they plug up and need to be cleaned. I use a long drill bit and doubled up 0.040 safety wire, then a bore brush. Doug Mountjoy svPegasus LF38 just west of Ballard, WA. ------ Original message------ From: Tom Buscaglia via CnC-List Date: Mon, May 4, 2015 18:19 To: cnc-list@cnc-list.com ; Subject: Stus-List Overheating as high RPM only We did a run last weekend to a local harbor for the weekend. Windwas fluky and it was a short trip so we were motoring. Alera has aYanmar 3HM35 with around 700 original hours and was running fine at ourusual cruising RPM of 26-2800 on the tach. The hot alarm went offand I let her cool down and then ran at a lower ROM (1800 or so) and nomore alarms. When I got to our destination, I cleaned out the rawwater trap as it was pretty crapped up. On the way back the alarmwent off again but this time all I had to do was throttle back to around2200 and it was fine. Much less steam/smoke that on the wayout. Today I checked the fan belt on the pump and it was a little loose so Itightened that. I'll be getting her hauled next week for a pressurewash, prop grease and zinc replacement, and will check the intakethen. Aside from the intake, belt and crap trap, anything else I shouldcheck? 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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