Josh, There is indeed the option of going with the Yanmar “F” bits, but that water pump, housing, thermostat, new hoses option is upwards of $500 from what I’ve seen. Then there’s the $1900 heat exchanger to replace the Raw Water version AND to top things off, new fuel feed lines from the high pressure pump to the injectors that routes around the larger heat exchanger. And that’s if everything is still available. The folks at Mack Boring think that may be an issue for this model engine. If the Sendure conversion was a factory install, I’m tempted to replace the Jabsco unit with a similar or modestly better one and hope for the best as Fred has done. Diagrams of the aftermarket system show the pump direction flowing coolant into the Block after it has been run through the exchanger. This would mean cooler fluid being run through the pump. Easier on a rubber impeller... I really don’t want to spend thousands on the diesel this year... Chuck Gilchrest S/V Half Magic 1983 Landfall 35 Padanaram MA
Sent from my iPhone > On Apr 30, 2018, at 3:33 PM, Josh Muckley via CnC-List > <[email protected]> wrote: > > The block for the 3HM35 and the 3HM35F are exactly the same. Why no try to > use the appropriate water pump for the 3HM35F? There is probably a blanked > off plate on the front of the engine where the pump should go. Going this > route also allows you to use the normal belts. > > See page 17/18 > https://drive.google.com/file/d/0B8pEh5lnvP1yNHdjQTRoMVFZMEk/view?usp=drivesdk > > Here's a picture of the front of a 3HM35F > https://drive.google.com/file/d/0B8pEh5lnvP1yUGs2NjhBMEhfQUU/view?usp=drivesdk > > Here's the whole folder of Yanmar stuff. > https://drive.google.com/folderview?id=0B8pEh5lnvP1yTkdrWTZVX3hRM28 > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > >> On Mon, Apr 30, 2018, 2:39 PM Chuck Gilchrest via CnC-List >> <[email protected]> wrote: >> 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 >> > _______________________________________________ > > 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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