Fogging questions

[PatM]

There is talk that the newer Cat engines shouldn’t be fogged. I just went from a 2009 196 pre Cat to a 2018 200 with the ZR4. I would spray the individual cylinders and then start the engine and shut it down when I see smoke.
My questions are first should I fog it at all? And second if I do fog it is what I use to do correct? Or should I not start the engine again after spraying the cylinders?


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[Beach-TJ]

Don't start the engine. Spray into each cylinder then turn the engine over by hand 2 or 3 times. Spray each cylinder again and turn over by hand again 3 or 4 times. Replace spark plugs for the winter.
In the spring remove all spark plugs, remove the ignition relay (MEFI), place old towels over each bank and bump the starter 3 or 4 times to blow out the fluid. Replace plugs and relay and enjoy.
Note you need to remove serpentine belt to turn engine by hand.
This is per fsm, you can find the fsms on this site.

[Beach-TJ]

I didn't intend to endorse fogging your engine. That's up to you, just wanted to point out the manual states it can be done.

http://www.planetnautique.com/Correc...PCM17NONDI.pdf

Page 59.

6.Turn off the ignition. If fogging the engine is
required for extended storage, remove the spark
plugs. Use an aerosol-type fogging solution and
spray a sufficient amount of oil into each cylinder
spark plug hole. (Follow the instructions for the
storage oil used.) Turn the crankshaft several
revolutions by hand to spread the oil evenly
throughout the cylinders.
Install the spark plugs and connect the spark
plug wires.

[Evening Shade]

I was told to not fog the cat engines back in 2007 when I bought my first boat with at cat engine and haven’t fogged an engine since. I’ve never had any problems. I really don’t know that it’s truly necessary for a few month winter lay up. We have short winters here in the south.

[scottb7]

Here in Minnesota, we have about a 6 month lay up and I don't fog.

[Beach-TJ]

I wish PCM would state what extended storage is.
6 weeks, months, years?????

No matter what it is though, not fogging for a single winter should never create an immediate problem. The question is at what point does rust on cylinder walls form and shorten the life of the engine. Ie, from a 5,000 hr to 1,500 hr. engine.

[Skidave]

I stopped fogging when my straw fell into the cylinder! Yes, I got it out.

Get one of those straw straps if you decide to fog.

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[scottb7]

I wish PCM would state what extended storage is.
6 weeks, months, years?????

No matter what it is though, not fogging for a single winter should never create an immediate problem. The question is at what point does rust on cylinder walls form and shorten the life of the engine. Ie, from a 5,000 hr to 1,500 hr. engine.

True, but i am guessing that extended is more than one year...

[Evening Shade]

True, but i am guessing that extended is more than one year...

I agree, but I also think PCM doesn’t give a time frame because it depends on the humidity level where the boat is being stored. An engine could probably be stored for years in the AZ desert without fogging and be fine.

[Infinity]

I have never fogged my CES engine either and not had an issue, I am also in the South where high humidity is not an issue. I think the main questions are....what climate you live in, and will it be stored outdoors where humidity has a much higher potentail than inside....and how long. I would think that in most situations, it would not be necessary and a waste of time tho there are always exceptions.

[Beach-TJ]

I agree, but I also think PCM doesn�t give a time frame because it depends on the humidity level where the boat is being stored. An engine could probably be stored for years in the AZ desert without fogging and be fine.

This is part of why i always fog, between the long winters in Ga ( usually 6 months ), and the high humidity, i just don't think it's worth risking. But i also like checking the engine, plugs, etc every year.

[scottb7]

i like to get "up close and personal" with my engine once a year...but i skip the fogging...

obviously you can do what you want but if i was in georgia i would not fog..