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Winterizing 7.4 efi on stand

Old 09-23-2012, 03:53 PM
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Default Winterizing 7.4 efi on stand

I have a 7.4 efi merc. Engine out of boat/on a stand. It was test run down south but now is in n my garage w/winter on its way.
What are the steps to getting water out of block,fuel cooler,etc...
Any tips and advice?
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Old 09-23-2012, 04:46 PM
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Disconnect all water hoses and drain plugs in block....

reassemble and fill with RV antifreeze through the thermostat hole in the intake for added security
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Last edited by obnoxus; 09-23-2012 at 11:01 PM.
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Old 09-23-2012, 10:50 PM
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I would just drain it. Like said, pull hoses, block and manifold drains and you are done.
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Old 09-24-2012, 12:19 AM
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Pull all the hoses and drain plugs (on exhaust manifold and block drains) and blow compressed air through them. I drain my block and exhaust after each use.
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Old 09-24-2012, 01:35 PM
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Thanks to all
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Old 09-24-2012, 08:47 PM
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In Maine as stated I would drain and blow out, but then use car antifreeze or at least the -100 (purple) RV stuff. You guys get cold up there.
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