engine winter flush

[mark_sabin]

I am getting our pride an joy ready for its winter layup and am wondering about the engine flush through. We have a Yanmar 2gm20 raw water cooled and I've read a bit about flushing it through but not seen with what to flush it with. Can anyone advise on what I should flush it with before we take the boat out of the water?

Any advice welcome

Mark Sabin

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[ashanta]

Mark,

Wait until you take it out of the water, then flush it out, initially with clean fresh water. Continue until the engine gets to normal temp and the thermostat opens. you then allow antifreeze mix to enter the engine block.
there special soluable oils which are rust inhibitors but they are expensive. If the engine is in good nick the antifreeze will suffice.
Change your oil and oil filter as well but leave the rest of the service until your ready to launch. This will prevent the sulphur build up from the dirty oil.

Regards.

Peter.

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[Chris_Robb]

Mark -

Normally the basic preparation is to run 50% Antifreeze in through your engine, untill the exhaust is running with the blue liquid. This provides anti corrorion protection and from freezing.

It is probably easier to do this once the boat is out of the water. I have a plastic pipe that fits snugly into the water intake. I place this in a bucket of water and run the engione with fresh water for some time, and then add half a bucket of antifreeze/water and run it through the engine.

I beleive that there are desalting products - but I am not sure whether they are worthwhile flushing through as well - some one else comment on that?



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[Lofty]

I remove the pipe from the inlet sea cock and the pipe which injects the water into the exhaust system and place them both in an anti-freeze container. Then I remove the thermostat and replace it with an old themostat from which I have removed the valve just leaving the mounting plate and rubber seal. I run the engine until I have anti-freeze returning to the container which only takes a few seconds and the jobs done. Just dont forget to put the serviceable thermostat back next season

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[mark_sabin]

Thanks peeps, Someone told me that it would be ok to do this in the water letting the solution run into the marina for a short time. Not sure on the environment issues on that. thanks for the advice. Think i will do it today providing I'm in a fit state after the rugby!!!

again thanks

Mark

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