Thanks for the suggestion on the mixing elbow. That's my next item on the list after the injector. I've read that Yanmar had some very big mixing elbow issues with some falling apart inside from broken welds and pitted stainless steel issues. I'm not sure if there's a t-stat. I've never been able to find it. It's possible there could be blockages in the raw water channels as a piece of impeller had broke off years ago and could not be found. It was very small and hopefully went through. The good news is these are simple engines and Nigel's book has been helpful. Cheers
Brent 27-5 s/v Wild Rover Sent from my iPhone > On Apr 2, 2017, at 7:51 PM, Rick Brass via CnC-List <cnc-list@cnc-list.com> > wrote: > > We’ve already determined that Brent has a raw water cooled engine, so there > is not coolant to moniter. > > Normally there is a bypass arrangement in the thermostat housing that allows > a small amount of water to circulate through the block to eliminate/minimize > the sort of uneven heating you mentioned until the engine comes up to > operating temperature and the thermostat opens. It could be as elaborate as a > spring loaded poppet or as basic as a small hole in the thermostat itself. I > don’t recall what Yanmar did on the 1/2/3GM. But if you shut off the raw > water feed in a raw water engine, you would get the sort of uneven heating > mentioned plus you’d probably ruin the water pump impeller. > > Brent, have you cleaned out the mixing elbow where cooling water gets put > into the exhaust within the last 100 or so engine hours? Don’t know about the > white smoke/steam; but plugged mixing elbow is a notorious cause of hard > starting problems on Yanmars. > > > Rick Brass > Washington, NC > > > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Gary > Russell via CnC-List > Sent: Sunday, April 02, 2017 1:18 PM > To: C&C List <cnc-list@cnc-list.com> > Cc: Gary Russell <captnga...@gmail.com> > Subject: Re: Stus-List white smoke/steam > > I would not recommend that, as the uneven heating of the head and block could > do a lot of damage before you could ascertain whether there was white smoke > or steam coming out. Carefully watching the coolant level is the safest > thing to do. > > Gary > S/V Kaylarah > > ~~~~~~~_/)~~~~~~ > > > On Sun, Apr 2, 2017 at 10:13 AM, Brent Driedger via CnC-List > <cnc-list@cnc-list.com> wrote: > While not good for the raw water impeller, could a test be carried out where > a cold engine is started without a raw water feed for a couple of minutes. > If theres a coolant leak in the cylinder the smoke should disappear. Just > thinking outside the box. > > Brent > 27-5 > s/v Wild Rover > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated!
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