Stus-List Overheating as high RPM only

Rick Rohwer rickrohwer at gmail.com
Wed May 6 12:37:34 EDT 2015


On start up last summer departing Powell River our CC37+ Paikea started steaming as we motored toward Lund.  A lot of bad things can cause that change! I powered back to near idle and limped back into PR.   The belt looked fine, so then disassembled the impellor cover and replaced the impellor even though it looked sound.  I figured the next easy step would to be make sure I am getting supply so I started working toward the through hull.  Nothing but a trickle through any of the hoses.  It’s funny how you anticipate the worst case.   I removed the clamps on the through hull with the valve shut and pulled off the hose, and incredibly, could see a shiny head and two eyes.  A sardine had taken a head first plunge into our intake!  I opened the valve and a 3” fish shot into the bilge.  The trip had not gone well for him, but it sure had improved on my end!   

Cheers
Rick 
 “Paikea”    
Poulsbo, WA
> On May 5, 2015, at 3:28 PM, Richard Bush via CnC-List <cnc-list at cnc-list.com> wrote:
> 
> OK, what's a crossover elbow? 
> 
>> On May 5, 2015, at 5:58 PM, ahycrace--- via CnC-List <cnc-list at cnc-list.com> wrote:
>> 
>> 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 at 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: "svpegasus38 at gmail.com via CnC-List" <cnc-list at cnc-list.com> 
>>> To: cnc-list at 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 at 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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