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 MountjoysvPegasusLF38 just west of Ballard, WA.
------ Original message------From: Tom Buscaglia via CnC-ListDate: Mon, May 4,
2015 18:19To: cnc-list@cnc-list.com;Subject:Stus-List Overheating as high RPM
onlyWe 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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