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: > > 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 > >
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