You can use the shop-vac to blow out the system too...or a garden hose. On May 17, 2015 4:51 PM, "Gary Nylander via CnC-List" <cnc-list@cnc-list.com> wrote:
> I agree with the comments which Rick made. I had intermittent cooling > problems on my Yanmar 2QM15 for a number of years - most of the time when > it had been run for a while, then stopped, then started again. The whistle > was annoying... > > I then had more serious problems, and found the impeller had come apart. I > took all the little pieces of the busted impeller and assembled them with > glue and tape to make sure there was nothing still in the engine. OK. With > a new impeller it went back to overheating every so often like it used to > do. > > I started again - I ran the engine each time I changed anything... After > checking the hoses, strainer, pump, more hoses, and replacing the zincs, I > found not much water coming through the hose leading to the zinc at the > forward part of the engine. Confusing. When I pulled the hose going to the > zinc area and fired the engine, I found a piece of an impeller which was > hard as a rock and coated in rust stuck in there. The impeller I had just > pulled was recent, no rust and not hard. All the other impellers I have > changed in 20+ years of ownership had been whole. > The only thing I can think of is that piece must have been in there for > years - - - and only caused problems in certain conditions. Once it was > removed, I have had no cooling problems for the last year! > > Start at one end, and follow it through. Blow out everything as you go. > > Gary Nylander > 30-1 Maryland > > ----- Original Message ----- > *From:* Rick Rohwer via CnC-List <cnc-list@cnc-list.com> > *To:* cnc-list@cnc-list.com > *Cc:* Rick Rohwer <rickroh...@gmail.com> > *Sent:* Sunday, May 17, 2015 12:44 PM > *Subject:* Re: Stus-List Impeller Damn... > > Hi David, > i'll chime in and hope it helps. > > If you are lucky, the vane was torn to tiny particles and pushed all the > way through the cooling system and you are free as rain! > > If you are like me, it is lurking somewhere in the system between the pump > and the exhaust outlet and pretty much the same size as when it left. In a > raw water cooled application, that means it could be anywhere in the > cooling system of your engine block, potentially blocking or contributing > to future blockage. In a fresh water cooling system I think the chunks end > up in the heat exchanger or where the raw water is introduced to the > exhaust gases. > > Just as a suggestion, try not to run the engine, and starting at the pump, > work your way up line carefully checking for pieces in the hoses hoping > that it lodged in that line prior to entering the block. Hang on to any > chunks you find so you can get an idea of how pulverized it is. After that > point i doubt that there is much chance you would find it. i don't know > that there is much you can do after that except watch temps and signs of > overheating. Maybe the new fully functioning impeller will push it out > over time. > > I like to "lay hands" on my diesel occasionally! I had a hot tub that > would heal itself on occasion after a brief group hug! > > Good luck, > > Rick > C&C 37+ Paikea > Poulsbo, WA > > > > On May 17, 2015, at 6:01 AM, David via CnC-List <cnc-list@cnc-list.com> > wrote: > > A first time. Found a missing impeller vane on my 3QM30. The whole > damn vane. Suggestions before I start tearing the who damned cooling > system apart? Its a raw water cooled engine with a Sen-Dur retro-fit. > > Thanks in advance. > > > David F. Risch > C & C 40-2 > (401) 419-4650 (cell) > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > ------------------------------ > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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