I just winterized my 2003 220 with the 350 MPI.
I drained all the water out of the engine and replaced the drains/vent with new 0-rings. I poured the antifreeze into the block until it was full, then filled the exhaust risers until I could hear the stuff hitting the ground behind the boat.
If it's pouring down the transom, does that mean the exhaust bellows is in bad shape, or is this "normal?"
I am hesitant to fog the engine. I might take the boat out again on a nice day...decisions, decisions...
Winterizing the engine
- Mike in SC
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Re: Winterizing the engine
fog fog fog....call the merc customer service line and they will tell you to fog for a several month layupMike in SC wrote: Fri Nov 08, 2019 6:03 pm I just winterized my 2003 220 with the 350 MPI.
I drained all the water out of the engine and replaced the drains/vent with new 0-rings. I poured the antifreeze into the block until it was full, then filled the exhaust risers until I could hear the stuff hitting the ground behind the boat.
If it's pouring down the transom, does that mean the exhaust bellows is in bad shape, or is this "normal?"
I am hesitant to fog the engine. I might take the boat out again on a nice day...decisions, decisions...
2016 R7 VP 380
2014 220S Merc 5.0L (sold)
Columbus, OH
Chautauqua, NY
2014 220S Merc 5.0L (sold)
Columbus, OH
Chautauqua, NY
- akorcovelos
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Re: Winterizing the engine
what sucks is to fog you'll need to re-winterize afterwards...
1996 252 Whipple tuned 454 Magnum MPI, 496 exhaust, Corsa Captains Call, B3 w/Simrek drive shower.
‘Direct Deposit Too’
Antioch, IL
Fox Chain O' Lakes
‘Direct Deposit Too’
Antioch, IL
Fox Chain O' Lakes
- Mike in SC
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Re: Winterizing the engine
Gotcha.akorcovelos wrote: Tue Nov 12, 2019 9:58 am what sucks is to fog you'll need to re-winterize afterwards...
To re winterize the block and risers is four plugs pulled, three hoses removed and about 5 gal antifreeze.
Fogging engine not quite as time critical I suppose, it's below freezing now so i had to do that much.
Thanks for your advice.
Mike in SC
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
- Mike in SC
- Captain

- Posts: 327
- Joined: Sun Jul 14, 2019 9:37 pm
- Location: Lake Murray, SC
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Re: Winterizing the engine
Well I finally took my boat to the pros, paid them to fog the engine and dewater, treat the gas, etc.
I'll take it to them in the spring to do some more in-depth maintenance items.
Now to plan the off season mods and find the nice day to work on them!
I'll take it to them in the spring to do some more in-depth maintenance items.
Now to plan the off season mods and find the nice day to work on them!
Mike in SC
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
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