Re: Stus-List problem getting the raw water flowing
I once replaced the impeller on my yanmar 3gm30 and when I put the plate back on the pump it was not seated properly and the pump kept losing its prime. With enough rpm s it would start pumping again only to lose its prime again on start up. Might be worth checking. The plate must be air/water tight. Gary KolcLiberty38' Mk 2 Sent from my Verizon, Samsung Galaxy Tablet Original message From: Josh Muckley via CnC-List Date: 5/30/18 4:43 PM (GMT-05:00) To: cnc-list@cnc-list.com Cc: Josh Muckley Subject: Re: Stus-List problem getting the raw water flowing I've had the tips of the impeller vanes wear off and combined with the set which the vanes had taken the pump was unable to generate enough force to both suck and blow unless I reved the engine. This condition didn't cause any perceivable problems until I was attempting to winterize and the level in the jug just wouldn't go down. If you haven't replaced the impeller lately. Replace the impeller and get back to us. Josh Muckley S/V Sea Hawk 1989 C 37+Solomons, MD On Wed, May 30, 2018, 1:47 PM Eric Frank via CnC-List wrote: Never had trouble with this before, but this year I could not get the raw water going out the exhaust when I was getting ready for launching. Always use a bucket of fresh water on the intake to the raw water pump (new impeller every year) just to make sure things are working. Engine started fine but no water out the exhaust. Impeller was turning when I cranked the engine so thought the problem might be downstream of that. A mechanic at the yard reported back that things were fine and he just had to run the engine at a high RPM to get the raw water flowing. Anyone else experience that? Does it suggest that the tubes where the raw water cools the engine water could be getting clogged? Advice appreciated. Eric Frank Cat's Paw C 35 Mk II Mattapoisett, 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
Re: Stus-List problem getting the raw water flowing
Thanks for all the helpful input. As some suggested, the problem is almost certainly a clogged exhaust elbow. Several years ago (7 or 8?) the same thing happened but as we were motoring slowly up to our mooring. The yard fixed it by replacing the exhaust elbow. So it is clearly time to do that again. Thanks especially to Francois Rivard, who supplied a detailed description of the problem and its solution. BTW, some asked what engine it is. It’s a Perkins Perama M30, installed by the PO, probably around 1985. Showing its age in terms of surface rust, but still running fine. Eric Frank Cat's Paw C 35 Mk II Mattapoisett, 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
Re: Stus-List problem getting the raw water flowing
Eric; You didn't say what engine you are working with. If it is a Yanmar, the sudden onset of no water flow suggest that the exhaust elbow is plugged with carbon. Particularly if you've not taken action to remove the carbon buildup in the last 100-200 engine hours. If you still have an A4, or the Westerbeke that was an option, I'd guess the problem is most likely a worn or damaged impeller in the raw water pump. "Sudden" onset of the problem seems to argue against that, but it is possible that worn vanes might prevent the vanes from getting a good seal and creating suction needed to fill the cooling system. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Eric Frank via CnC-List Sent: Wednesday, May 30, 2018 1:47 PM To: cnc-list@cnc-list.com Cc: Eric Frank Subject: Stus-List problem getting the raw water flowing Never had trouble with this before, but this year I could not get the raw water going out the exhaust when I was getting ready for launching. Always use a bucket of fresh water on the intake to the raw water pump (new impeller every year) just to make sure things are working. Engine started fine but no water out the exhaust. Impeller was turning when I cranked the engine so thought the problem might be downstream of that. A mechanic at the yard reported back that things were fine and he just had to run the engine at a high RPM to get the raw water flowing. Anyone else experience that? Does it suggest that the tubes where the raw water cools the engine water could be getting clogged? Advice appreciated. Eric Frank Cat's Paw C 35 Mk II Mattapoisett, 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
Re: Stus-List problem getting the raw water flowing
I've had the tips of the impeller vanes wear off and combined with the set which the vanes had taken the pump was unable to generate enough force to both suck and blow unless I reved the engine. This condition didn't cause any perceivable problems until I was attempting to winterize and the level in the jug just wouldn't go down. If you haven't replaced the impeller lately. Replace the impeller and get back to us. Josh Muckley S/V Sea Hawk 1989 C 37+ Solomons, MD On Wed, May 30, 2018, 1:47 PM Eric Frank via CnC-List wrote: > Never had trouble with this before, but this year I could not get the raw > water going out the exhaust when I was getting ready for launching. Always > use a bucket of fresh water on the intake to the raw water pump (new > impeller every year) just to make sure things are working. Engine started > fine but no water out the exhaust. Impeller was turning when I cranked the > engine so thought the problem might be downstream of that. A mechanic at > the yard reported back that things were fine and he just had to run the > engine at a high RPM to get the raw water flowing. Anyone else experience > that? Does it suggest that the tubes where the raw water cools the engine > water could be getting clogged? Advice appreciated. > > Eric Frank > Cat's Paw > C 35 Mk II > Mattapoisett, 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
Re: Stus-List problem getting the raw water flowing
Eric, You didn't say what engine. I've had a couple issues that might be helpful. On launch a couple years ago, there was no raw water flow. Fortunately my slip was mere feet away and I got the boat docked. On investigation, I traced the problem to pluggage in the raw water inlet upstream of the strainer. I had to use dock water to blow it out the thru-hull. Never did see what it was. Mud dauber nest? Practical joker stuffing something up the thru-hull while the boat was one the hard? No clue. The other issue is related primarily to Universal/Westerbekes that have a zinc in the heat exchanger. I had to pull the end caps and remove several pieces of pencil zinc in the exchanger. See: https://marinehowto.com/westerbeke-universal-marine-heat-exchanger-cleaning/ The engine began to slowly overheat at higher rpm's. Once I removed the zinc pieces, the temperature returned to normal. Dennis C. Touche' 35-1 #83 Mandeville, LA On Wed, May 30, 2018 at 12:46 PM, Eric Frank via CnC-List < cnc-list@cnc-list.com> wrote: > Never had trouble with this before, but this year I could not get the raw > water going out the exhaust when I was getting ready for launching. Always > use a bucket of fresh water on the intake to the raw water pump (new > impeller every year) just to make sure things are working. Engine started > fine but no water out the exhaust. Impeller was turning when I cranked the > engine so thought the problem might be downstream of that. A mechanic at > the yard reported back that things were fine and he just had to run the > engine at a high RPM to get the raw water flowing. Anyone else experience > that? Does it suggest that the tubes where the raw water cools the engine > water could be getting clogged? Advice appreciated. > > Eric Frank > Cat's Paw > C 35 Mk II > Mattapoisett, 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
Re: Stus-List problem getting the raw water flowing
We had an issue too this year, first launch, as did another local boat. Were told very common that the exhaust elbow will close up due to mineral buildup. Apparently 3-5 year life. We took it off and cleared some crap out with a screwdriver, put it back on and flow was back. We plan to replace soon with a stainless steel copy of the Yanmar part, to see if it lasts longer. On May 30, 2018 11:08:48 Eric Frank via CnC-List wrote: Never had trouble with this before, but this year I could not get the raw water going out the exhaust when I was getting ready for launching. Always use a bucket of fresh water on the intake to the raw water pump (new impeller every year) just to make sure things are working. Engine started fine but no water out the exhaust. Impeller was turning when I cranked the engine so thought the problem might be downstream of that. A mechanic at the yard reported back that things were fine and he just had to run the engine at a high RPM to get the raw water flowing. Anyone else experience that? Does it suggest that the tubes where the raw water cools the engine water could be getting clogged? Advice appreciated. Eric Frank Cat's Paw C 35 Mk II Mattapoisett, 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
Re: Stus-List problem getting the raw water flowing
Some of the impeller the pin doesn't go through the rubber fins and it slips on the hub. You may wish to swap as a test. This has baffled many people because the impeller looks perfectly fine. Sent from my Samsung Galaxy smartphone. Original message From: Eric Frank via CnC-List Date: 2018-05-30 14:46 (GMT-04:00) To: cnc-list@cnc-list.com Cc: Eric Frank Subject: Stus-List problem getting the raw water flowing Never had trouble with this before, but this year I could not get the raw water going out the exhaust when I was getting ready for launching. Always use a bucket of fresh water on the intake to the raw water pump (new impeller every year) just to make sure things are working. Engine started fine but no water out the exhaust. Impeller was turning when I cranked the engine so thought the problem might be downstream of that. A mechanic at the yard reported back that things were fine and he just had to run the engine at a high RPM to get the raw water flowing. Anyone else experience that? Does it suggest that the tubes where the raw water cools the engine water could be getting clogged? Advice appreciated. Eric Frank Cat's Paw C 35 Mk II Mattapoisett, 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
