Curiouser and curiouser, Alice. Sent from my iPhone
On Apr 30, 2018, at 3:03 PM, John Conklin via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Following along !! I have the same 3HM in my new to me 1982 37 Having some Issues with overheating right now. There is an anti freeze tank and some kind of what looksOverflow tank was empty, and looks like some type of added on pump, as it partially covers the plate 3HM plate in the front. YES “bass akwards” engine and very hard to reach exhaust elbow as well I will post some pics as well But not sure what to do either? John Conklin ________________________________ From: CnC-List <cnc-list-boun...@cnc-list.com<mailto:cnc-list-boun...@cnc-list.com>> on behalf of Chuck Gilchrest via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Sent: Monday, April 30, 2018 2:39:03 PM To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com> Cc: Chuck Gilchrest Subject: Stus-List Fresh Water Conversion Yanmar 3HM Silly me. Since I bought my 1983 Landfall 35 a bit over 2 years ago, I had been under the assumption since there was an “expansion tank” on the engine that had coolant in it, that it was a fresh water cooled engine from the factory. It is a Yanmar 3HM 30. No (F) on the engine tag. I had never even bothered to look.. Yeah, the heat exchanger looked a bit different from the one in the Yanmar manual, but since I’d been having a marina commission and decommission my engine each year, changing water pump impellers as necessary (“go ahead and do it”), I thought all was OK. I even had a raw water pump changed out when the old one was demolished due to the “cam” screw backing out and galling the inside of the pump. Turns out there’s more going on. Low and behold, this year, when the mechanic looked around the engine, he mentioned that it was the first time he’d ever seen a small diesel with not one but two raw water pumps. As it turns out, the engine appears to have had a fresh water conversion which was made by Sen-Dure, (thus the Sen-Dure expansion tank/heat exchanger) and a second external pump running off a belt. So one of the two coolant pumps is actually a circulation pump (the one down low on the engine) and the other is a raw water pump..the one we replaced last year. Has anyone ever heard of C&C converting engines from Raw to Fresh at the factory (Barry Carroll, Middletown RI built boat), or is it more likely an owner conversion? My mechanic says that the rubber impeller on a raw water pump will never hold up to the heat of the interior engine coolant and will always burn up impellers prematurely if I keep things as they are. At one point Yanmar made a fresh water conversion kit for 3HM engines, but very unlikely there would be any availability considering the motor hasn’t been built since 1983. This engine is somewhat dastardly in that it is installed backwards with a V-Drive, making access to the “front” of the motor a really tough job. Right now, I’m at a crossroads which involves: 1. Finding a suitable circulation pump that is up to the job for the existing system, since I just de-scaled the heat exhchanger and bought a new stainless mixing elbow 2. Finding the needed parts to do a Yanmar factory Fresh water conversion 3. Keep the boat out of the water this year and save up to re-power. Lavishing multiple thousands at a 36 year old diesel may not be the best way to spend money. Any suggestions would be welcome.. Chuck Gilchrest S/V Half Magic 1983 Landfall 35 Padanaram, MA _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
