When I had a raw water cooled 3GM, the 1st time I went to replace the impellor I found only 1 vane left. Interestingly, the engine was not overheating.
Some years later when I had an overheating problem it was the exhaust elbow that had cloggd with a carbon build up. When I removed the elbow I found a great many vanes trapped there. The vanes were pretty much full sized. Fred Hazzard S/V Fury C&C 44 Portland, Or On Sun, May 17, 2015 at 9:44 AM, Rick Rohwer via CnC-List < cnc-list@cnc-list.com> wrote: > 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 > > >
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