Bruce, On my 1994 37/40+ there is an access port in the head bulkhead. This makes it easier to work on the raw water pump and starter. I don't know how you would access either without it. You might want to dress the face of the pump with a smooth flat file, just to remove a thigh spots that might be preventing the cover from solidly contacting the oring
Al Liles SV Elendil Vancouver > On Jun 7, 2017, at 7:42 AM, Charlie Nelson via CnC-List > <[email protected]> wrote: > > Note that you may also have an O ring or 2 on the shaft that the impeller > turns on that are on the engine side of the impeller. On my Beta, there were > 2 O rings between the impeller and the engine--these keep the water out of > the crankcase, etc. > If these are bad or the shaft is 'scored', replacing impellers, or O rings on > the non-engine/impeller side of the shaft will not solve your problem. > > In my case the shaft was 'scored' and I needed to replace the entire pump > assembly since the Beta shop could not reasonably remove the scoring. > > Charlie Nelson > Water Phantom > C&C 36 XL/kcb > Oriental, NC > > [email protected] > > > -----Original Message----- > From: Neil Gallagher via CnC-List <[email protected]> > To: cnc-list <[email protected]> > Cc: Neil Gallagher <[email protected]> > Sent: Wed, Jun 7, 2017 10:18 am > Subject: Re: Stus-List Yanmar 3JH2E leak around water pump impeller cover > > Bruce, > > The issue with putting a gasket under the cover is that now the cover will be > moved away from the edge of the vanes of the impeller. The pump works by > creating a vacuum in each space between the vanes at the inlet as the > impeller vanes open up and pressure when the vanes close down a the outlet. > The vanes need to contact the cover to create a seal, that's why an o-ring is > used, it keeps the cover in contact with the edge of the vanes. Bottom line, > the gasket would have to be very thin not to affect the pump's performance. > > On some pumps you can buy a new cover as well as the gasket because the cover > wears, I'm not sure about the Yanmar. > > Neil Gallagher > Weatherly, 35-1 > Glen Cove, NY > > On 6/7/2017 8:51 AM, Bruce Whitmore via CnC-List wrote: > Hello, > > I replaced the impeller on a Yanmar 3JH2E about a month ago, and I was > checking over the engine last weekend and noticed some wetness coming through > around the impeller cover. I tightened the cover bolts (they were not really > loose), and the leak still continues. When I replaced the impeller, I also > replaced the o-ring, so that should not be the issue. That said, the old > o-ring had a tear (the cover was leaking, though more so then). The face of > the water pump was also a little rough, presumably from people prying with > angled needle nose pliers in the process of removing the old impeller. That > said, the cover itself was smooth, and the groove for the o-ring was fine as > well. > > I personally don't like the idea of relying on Yanmar's very thin o-ring for > sealing something that is below the water line. I am thinking about getting > some thin cork gasket material, and cutting a proper gasket, applying teflon > grease to it, and using a gasket instead. > > Is this a bad idea? > > By the way, our boat is a 1994 C&C 37/40+, and the way the engine is mounted > in the boat, it is nearly impossible to get to the bolts to remove the water > pump, and even removing the starter is not exactly a fun job, again due to > poor access to mounting bolts. > > Thanks for your insights! > > Bruce Whitmore > > (847) 404-5092 (mobile) > [email protected] > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated!
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