Tom
I had the same problem and it turned out to be the crossover elbow,
changed it and the problem went away. You can get a kit with all new bolts and
gaskets from oldport marine in Newport RI. (Yanmar 3gm30) I hear it is a
common thing. It was easy to do.
Gary Kolc
---- Chuck S via CnC-List <cnc-list@cnc-list.com> wrote:
> 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
>
>
> _______________________________________________
>
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