I have a Globe Impeller in my boat and have started using them at work too. They definitely seem to live up to their claims. At work we would routinely destroy even brand new rubber impellers since they would sit for months and be allowed to dry out. Similarly I have gone 4 years between changes on my boat's impeller. I didn't have to replace it when I did but rather chose to and then later discovered some cracks on the vanes.
I also run a SpeedSeal Life which I'm sure helps. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mon, Apr 30, 2018, 4:28 PM Bill Coleman via CnC-List < [email protected]> wrote: > What about those Blue Globe Impellers? They seem much better that the > neoprene style of old, and seem to be a silicone blend, or something. They > seem to hold up much better, and they also have a hardier Red Impeller, > which I believe is intended for Diesel, and I think Higher Temps. > > > > Bill Coleman > > C&C 39 Erie > > > > *From:* CnC-List [mailto:[email protected]] *On Behalf Of *Chuck > Gilchrest via CnC-List > *Sent:* Monday, April 30, 2018 3:56 PM > *To:* [email protected] > *Cc:* Chuck Gilchrest > *Subject:* Re: Stus-List Fresh Water Conversion Yanmar 3HM > > > > Fred, > > Mine was Jabsco as well. My engine tech said he’s concerned that a Jabsco > rubber impeller wouldn’t be up to the task of the heat in a circulation > pump. Any thoughts there? I suspect it would need to be checked often > just like the raw pump impeller. Maybe I just need to inspect the Sendure > exchanger for any blockages, change impeller and get the boat in the water. > > Chuck Gilchrest > > Half Magic > > 83 35 LF > > Padanaram MA > > Sent from my iPhone > > > On Apr 30, 2018, at 3:04 PM, Frederick G Street via CnC-List < > [email protected]> wrote: > > Chuck — my 1979 Landfall 38 (Middletown-built) appears to have come with a > factory-installed Sen-Dure heat-exchanger and added circulation pump (a > Jabsco, which I have since replaced with another Jabsco, rather than try to > rebuild). I also have the challenges of no access (V-drive). > > > > — Fred > > > Fred Street -- Minneapolis > S/V *Oceanis* (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > > > > On Apr 30, 2018, at 1:39 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 > > > > _______________________________________________ > > 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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