This Forum is supported by C&C 27 owners like you whose membership in the C&C 27 Association makes possible this Forum and the accompanying site. Thank you, members, for your continuing commitment.
You are not logged in.
Pages: 1
What's the proper way to winterize a MK V - Diesel Yanmar engine.
I read somewhere here that you have to ensure that the engine is "hot" so that the thermostat is open to allow the antifreeze to circulate through the whole engine.
How do you know when the thermostat is indeed open and all the required circulation has taken place?
John,
Perhaps this is too late to be useful but...
I've just finished putting my Mk V with 1GM Yanmar away for the second end-of-season. Last winter though a similar discussion was making me feel sick since I simply, after hauling out, disconnected the raw water intake hose at the through-hull, stuck the hose in a bottle of antifreeze, started the engine and ran it until antifreeze was being discharged. No one had told me anything about the engine needing to be warm or the antifreeze would not flow to where it was needed to protect from freezing. And we get some significant freezing in Winnipeg, Manitoba!
To my relief, everything seemed fine last spring.
My two cents,
Robert
Skylark
C&C 27 Mk V #18
I have been following the same procecure as well for the last few years without a problem. Then I heard about the extra info wrt to the thermostat and wanted to have it cleared up.
well, I hope you get an answer - I googled yanmar web sites yesrterday to try to get an answer and couldn't find a thing. How much anti-freeze do you put through? I usually pump through 2 jugs (8 liters?) - I get anti freeze out after the first jug- the second is just for good measure. I usually run the engine on just water for 3 or 4 minutes first - and have no idea if that does any good.
Jim W
Distant Thunder
In a closed system with a heat exchanger you can remove the radiator cap, then start the motor, and when the thermostat opens there will be a noticeable flow visible. Do not remove the cap after starting the motor. Make sure it is removed before it has time to get hot and pressurize the system. Raw water cooled motors should have a petcock to drain them.
Check out this link: <A href="http://www.marinedieseldirect.com/yanmar/shopping/article.php?category=2&article=30&title=Winterizing&subtitle=Spring%20Systems%20Check">http://www.marinedieseldirect.com/yanmar/shopping/article.php?category=2&article=30&title=Winterizing&subtitle=Spring%20Systems%20Check</A>
It has comments and ideas about both closed systems and raw water cooled systems. Nigel calder discusses winterizing on page 114 of "Marine Diesel Engines". He suggests using 50/50 solution of water antifreeze in the raw water intake hose until the mixture is pumped out the exhaust.
Mike M
SV Pura Vida
#375
Galveston Bay
Mike M
SV Wind Horse
#375
Galveston, Tx
Offline
I couldn't help getting the Yanmar manual to see what it said...
The Yanmar Operations Manual for the 1GM, 2GM, 3GMD and 3HM series engines offers the following instructions for long term storage.
<OL style="MARGIN-TOP: 0in" type=1>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">Drain the fuel completely from the fuel tank to prevent moisture from mixing with the fuel.</LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">Wash the cooling system with clean tap water and then drain the engine. Here Yanmar shows the cooling water drain cock between the exhaust and the dip stick in the name of parts but describes the part as being below the intake silencer on the other side of the engine. </LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">Drain the exhaust manifold. </LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">Remove the cover from the cooling water pump. </LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">Apply an anti–rust oil to any part which will rust easily.</LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">Remove the battery and store in a dry place.</LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">‘Tape to seal air inlet, exhaust pipe, and fuel tank cap.” </LI>
<LI class=MsoNormal style="MARGIN: 0in 0in 0pt; mso-list: l0 level1 lfo1; tab-stops: list .5in">Clean the engine and thoroughly. Touch up surfaces that are scratched or chipped.</LI></OL>
Seloc has a 22 point checklist which suggests leaving the fuel tank full and leaving the exhaust and intake open to prevent trapping condensation.
If anyone would like more information from the relative pages from the Yanmar manual please let me know directly. I would be happy to PDF the diagrams and forward them to any one interested.
Mike M
SV Wind Horse
#375
Galveston Bay
Mike M
SV Wind Horse
#375
Galveston, Tx
Offline
I believe that the Yanmar 1GM thermostat has a by-pass which allows some "water" (or antifreeze) to circulate through the block even when the engine is cold. The prove this to yourself, just pull the thermostat and observe the opening (hole) in the valve which closes off the main flow until the operating temp is reached.
Pages: 1