I'll check when I get home regarding my boat's pump but the impeller for the industrial pump at work has a metal sleeve. I can't say for sure that there is NO plastic, but at least the shaft interface is not.
Josh On Mon, Apr 30, 2018, 5:18 PM Jim Reinardy via CnC-List < [email protected]> wrote: > Perhaps they have changed the design, but the Globe impellers I used for a > while on my old Atomic 4 equipped Catalina had a plastic inner ring with a > keyway that the shaft went into. That boat was raw water cooled in Lake > Michigan, so no heat issues in that pump. The plastic ring cracked in less > than a season of use. The shaft started spinning inside it and water flow > stopped. I spotted the lack of water exhaust before any real damage got > done, but I would need to know they are using metal inner rings before I > would consider them again. > > Jim Reinardy > C&C 30-2 "Firewater" > Milwaukee, WI > > > --------- Original Message --------- > > Subject: Re: Stus-List Fresh Water Conversion Yanmar 3HM > > From: "Josh Muckley via CnC-List" <[email protected]> > Date: 4/30/18 1:56 pm > To: "C&C List" <[email protected]> > Cc: "Josh Muckley" <[email protected]> > > 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 >> > _______________________________________________ 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
