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:[email protected]] On Behalf Of Gary Russell via CnC-List Sent: Sunday, April 02, 2017 1:18 PM To: C&C List <[email protected]> Cc: Gary Russell <[email protected]> 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 <[email protected] <mailto:[email protected]> > 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
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