As always Terry your convoluted advise is a BIG help. NOT!!!!!
Fast Freddie From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Terry Sent: Wednesday, May 15, 2013 3:05 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Overheating due to plugged knuckle Fred, the older Yanmars have a reciprocating dingle valve to control the exhaust temperature in the fluval chamber. As you have already noticed, once the engine warms up, the dingle valve opens and lets the hot engine exhaust pass through the fluval chamber removing any excess unburned fuel. The newer engines have replaced the dingle valve with a resonating bundle arm so they don’t smoke even when just started. Hope this helps...T From: Fred Hazzard <mailto:fredhazz...@spiritone.com> Sent: Wednesday, May 15, 2013 2:54 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Overheating due to plugged knuckle Rick: My 1986 4 cyl Yanmar smokes a bit when first started. After about 5 mins of motoring at about ¾ throttle it smokes very little. An thoughts from your experience with these Yanmars? I have no idea of the hours as the hour meter was broken and showing 1100 hours when I bought the boat in 2007. This engine starts very easily and runs well. Fred Hazzard S/V Fury C&C 44 Portland, Or From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Rick Brass Sent: Wednesday, May 15, 2013 6:38 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Overheating due to plugged knuckle Russ is correct. With proper care, clean fuel, regular air cleaner changes, etc. 10.000 hours is attainable. In the forklift business, we routinely saw 16,000 or so hours out of the 4 cylinder Yanmars we used in the smaller trucks. Regarding the cost of an injector service, The last injector service on my previous engine (PO saved $300 on the exhaust installation, and cost me $8k for a replacement engine) was about $275 for four injectors. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Russ & Melody Sent: Tuesday, May 14, 2013 11:19 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Overheating due to plugged knuckle Hi Don, The black junk that plugs the mixing elbow can certainly be unburned carbon from a bad injector. A Yanmar that has only 1800 is a long way from the 5,000 hours you can get from an abused one these puppies. 10,000 hours is attainable with decent care. It probably just needs servicing, not replacing or a rebuild. My advice is get a guy to remove the injectors and bring them up to Nanaimo to have 'em serviced/rebuilt by Floyd at Action Fuel Injection. He is the best diesel fuel system dude on Vancouver Island. I think the latest guess is $100 - 150 per injector... but maybe phone Floyd for a chat. Cheers, Russ Sweet 35 mk-1 At 10:28 AM 14/05/2013, you wrote: Hi Kim Thanks for this. It is what I'm worried about. The boat has started to blow extra smoke on start and I'm thinking unburned diesel. It also blows smoke when you idle down for a bit and then rev up again. Once warmed up it seems fine. I've got a mechanic coming in a couple of weeks (they are backed up here in Victoria). What I worry about is the slippery slope on an old engine. It is 1981 with around 1800 hours and raw water cooled. It runs fairly nicely but..... I also worry about the cost of a new engine which would not materially change the value of the boat - as people were saying earlier - boats cheap, parts expensive. How many boat units did getting the injectors cost if you don't mind sharing. Don -----Original Message----- From: Kim Brown [mailto:kimcbr...@comcast.net] Sent: May-13-13 2:50 PM To: cnc-list@cnc-list.com Subject: Stus-List Overheating due to plugged knuckle Don Just went through this with my 3GMF30. Had Diesel Dan (really) out because we are headed to the Abacos next month. (anyone going to be there for Regatta Time?) I was suspicious of injectors- boat was running but xtra smoke on start, oily exhaust water. So better here than there. Had the injectors rebuilt and as part of the looksie he checked elbow and assorted other potential trouble spots. The knuckle was almost closed with gunk and was replaced. Never did overheat but that may be more because there is flow tapped off for my dripless allowing some flow to continue besides the meager amount still passing through the knuckle. The injector rebuild really worked wonders- thought it was running ok before but now smoke is minimal, pops right off, runs cooler and smoother. My guess is the gunk was unburnt fuel building up. Your mileage may vary but that is another path to explore..... I had replaced the elbow about a year ago and the knuckle was fine then so it built up relatively quickly. And I haven't sucked an impeller lately (on my FWC the vanes hang up at the front end of the heat exchanger and are a PITA to extract). Kim Brown Trust Me 35-3 ____________________________________________________________________________ Message: 3 Date: Mon, 13 May 2013 10:44:51 -0700 From: "Don Jonsson" <dbjons...@shaw.ca> To: <cnc-list@cnc-list.com> Subject: Stus-List Overheating due to plugged knuckle Message-ID: <003f01ce5001$9250c7c0$b6f25740$@ca> Content-Type: text/plain; charset="us-ascii" Hello all I have an elderly Yanmar 3GMD engine that is raw water cooled. It has plugged twice in the last two years where the water goes through a knuckle into the mixing elbow. The first time (summer before last) was some solid bit that had gotten stuck - how it got there I don't know. The last time (last week) was due to a tar like substance gumming up the knuckle. Easy to clear and I was on my way, but is this a harbinger of something more serious. I took the mixing elbow off a few years back and cleaned it, guess it is time to do that again. Is the plugging coming from the exhaust and working its way into the knuckle - for example unburned diesel? Thanks for any insight. Don _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com <http://www.cncphotoalbum.com/> CnC-List@cnc-list.com _____ _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com Terry Johnson S/V Ozymandias E-mail: tj...@comcast.net Website: www.tj622.com
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