Rick, Thank you. Correct on all counts except the missing vane is from the impeller which internally circulates the glycol.
I need to do a bit of digging around the Sen-Dur exchanger and its design. Flat out at work all week and will be back out it this weekend. FYI...The raw water pump needs to be replaced too. Leaking shaft. $400 for a pump. Whodathunk? Damn. David F. Risch (401) 419-4650 (cell) To: cnc-list@cnc-list.com Date: Mon, 18 May 2015 18:44:59 -0400 Subject: Re: Stus-List Impeller Damn... From: cnc-list@cnc-list.com CC: rickbr...@earthlink.net David, If I’m not mistaken, having the Sen-Dur retrofit makes it a fresh water cooled engine, not raw water. Two water pumps, right? The pump on the front of the engine circulates water/glycol through the engine block and to the heat exchanger, the second pumps sea water to the heat exchanger and then to the exhaust mixing elbow? If that is the case, and the impeller blade is from the sea water pump, there is about a 90% chance the blade is in the heat exchanger. Rick BrassWashington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David via CnC-List Sent: Sunday, May 17, 2015 6:01 PM To: CNC CNC Cc: David Subject: Re: Stus-List Impeller Damn... Thanks all. Checked obvious hose areas. Nothing. Ran it today on the hard, seemed fine, Will be launched tomorrow. As we are Bermuda bound in June I need to find that puppy as it will invariably find its way to the worst spot at the worst time. My guess its in the after market (Sen-Dur) heat exchanger. Wish me luck. David F. Risch 1981 40-2 (401) 419-4650 (cell) Date: Sun, 17 May 2015 16:11:49 -0500 To: cnc-list@cnc-list.com Subject: Re: Stus-List Impeller Damn... From: cnc-list@cnc-list.com CC: muckleyj@gmail.comYou 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 Nylander30-1 Maryland----- Original Message ----- From: Rick Rohwer via CnC-List To: cnc-list@cnc-list.com Cc: Rick Rohwer Sent: Sunday, May 17, 2015 12:44 PMSubject: 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, RickC&C 37+ PaikeaPoulsbo, 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 _______________________________________________ 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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