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to fog or not to fog..?


malibu.c.c

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i have a 350 monsoon with closed cooling and cat's,

some say dont fog if you have cats others say fog...

some say remove sparks and spray and turn engine ...

has anyone had problems from not fogging and engine that sits for 3-4 months ????

never did it on my old boat ...but i did start it once a month ..

this one i wont be around to run it once a month ...

thanks

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I have 2001 Indmar 310 carb and 2005 Hammerhead 383. I have never fogged the motors for the off season. They are stored indoors and kept dry. I make sure all water is out of the boats and they are well ventilated. I have debated whether this is right but I have a friend who is a long time mechanic (actually knows everything about motors) and he says not necessary. We are very dry most of the winter in the upper midwest. I know with cats you need to be careful and can't just spray fogging oil into the intake. By the way -- never had any problems with either motor.

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do you live in an area that is subject to fluctuations between warm and cool weather? if yes, possible condensation issues.

I had an outboard that didn't get fogged properly one winter and when i went to sell it the next season, the dealer inspected the cylinder thru the spark plug and noted a very small rust spot on the cylinder wall, i heard from the dealer a year later that the engine went out. ymmv

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I've went both ways with no discernible differences in the spring (except smoke on startup) - no cats, stored in a heated garage, well ventilated. when I did fog I did it running and fogged it to a stall.

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Ok, I know it is coming but the way I see it it is a motor just like in my car and that can sit for a year and still be just fine now a Jet Ski I may would do. But a real motor in a boat that is just a wast of time and money.

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I fog (since 1963) but use very little. A can will last me 10 years doing two motors, an i/b and an o/b. Both boats are stored outdoors all winter. No cat on the i/b.

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Ok, I know it is coming but the way I see it it is a motor just like in my car and that can sit for a year and still be just fine now a Jet Ski I may would do. But a real motor in a boat that is just a wast of time and money.

Thats how i see it as well... ok maybe run antifreeze so the areas with water in them dont corrode or freeze up.. but i don't get the fog it part .. since its a car engine and like you say a car can sit for years and still start up and run perfect ..

Edited by malibu.c.c
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Monsoon no cats

My Indmar Manual says to Fog

Paul/Bakes says to Fog

Clymers says to Fog

A can of fog is < $3

Fogging takes five minutes

Why would I skip this when winterizing?

Edited by Bozboat
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If you have an no cat engine - by all means fog it!

The only bad thing that can come out of fogging is getting Hydroloc or having the spray tube get sucked into the air intake while fogging the top end.

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Ok, I know it is coming but the way I see it it is a motor just like in my car and that can sit for a year and still be just fine now a Jet Ski I may would do. But a real motor in a boat that is just a wast of time and money.

the recommendation on storing a vehicle is to fog the engine:

full article: http://history.gmheritagecenter.com/wiki/index.php/Long_Term_Vehicle_Storage

excerpt:

If the vehicle will not be driven and not stored in a vehicle storage bag, use an engine fogging oil such as STA-BIL Fogging Oil or equivalent. Be sure to do this directly into the throttle body. Don't pass the product through the entire clean-air induction system because it will damage a Mass Air Flow Sensor. The instructions recommend spraying into the induction system with the engine running. (Good for valve guides and seats) Then shut the engine off and remove the spark plugs, spray the product into the combustion chambers. Cover the spark plug openings with shop towels to absorb the oil, and crank the engine over with the starter. To avoid washing the product away, disable the fuel pump. Plug the tail pipe(s) with an oily cloth.

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