I’m currently working on the boat hobby and can address this when I get back later this afternoon. 3HM to 3HMF conversion....
Best, Dave Sent from my iPhone > On Apr 30, 2018, at 15:26, svrebeccaleah via CnC-List <[email protected]> > wrote: > > Pegasus my old 38LF had been converted to fresh water cooling. Dont remember > who made the heat exchanger. It used the cam driven vane pump (old raw water > pump) as the recirculating pump. Replaced the impeller once in 10 years of > ownership. Yes access did suck. Never had an issue of that pump failing. Only > overheating issues I had was when the heat exchanger tubes became clogged. > My 39LF has the engine installed the right way (no vdrive) and good access to > everything except the dripless shaft packing. > > > > Doug Mountjoy > Rebecca Leah > LF39 > Port Orchard YC, WA. > > > > -------- Original message -------- > From: Chuck Gilchrest via CnC-List <[email protected]> > Date: 4/30/18 11:39 (GMT-08:00) > To: [email protected] > Cc: Chuck Gilchrest <[email protected]> > 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: > > 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 > Finding the needed parts to do a Yanmar factory Fresh water conversion > 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 >
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