Winterizing

MNboater

Recruit
Joined
Nov 5, 2003
Messages
2
I have seen many conflicting recommendations regarding winterizing Mercury 4 stroke outboards. What is the best way to winterize this motor?
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: Winterizing

Treat the fuel with Stabil, Change the oil, change the lower unit oil, fog the cylinders, spray the entire motor lightly with WD-40 to prevent corrosion and whatever the others with 4-strokes recommend. Here are some links for winterizing:<br /><br /> web page <br /><br /> web page <br /><br /> web page <br /><br /> web page <br /><br /> web page<br /><br />And one more:<br /><br /> web page<br /><br />Also, the Factory Manual should take care of it.
 

rschnack

Petty Officer 3rd Class
Joined
Oct 29, 2002
Messages
94
Re: Winterizing

Check your owner's manual if you have one or talk to a mechanic that is up to date with the Mercury Four Strokes. I just bought a 2001 50hp 4 stroke Mecury. The technitian at the marina I bought it from said that Mercury told him to never fog these motors. The motors don't heat up fast enough to burn the oil away. The fogging oil is thick enough to keep the valves from seating well during the first spring startup, which can cause problems. This marina loans out a fuel tank with a mixture of gas, fuel stabilizer and two stroke oil. They recommend running on this tank for ~ 1/2 hour then disconnecting the tank and letting the motor run out of fuel.<br /><br />RCS
 

BassMan283

Petty Officer 1st Class
Joined
Aug 26, 2002
Messages
277
Re: Winterizing

What rschnack said. In addition, I use Stabil in every tank full for my 2001 60 hp Merc 4-stroke. I have a 19 gal tank and the salesman recommended using stabilizer if I wasn't going to burn a tank in a month or so. A lot of my boating is on no-wake lakes and I can easily get 2 months out of a tank.
 

dbj1953

Cadet
Joined
Nov 26, 2003
Messages
8
Re: Winterizing

Unless you live up north(way up north) I wouldn't winterize anything. Keep a small amount of fresh gas available, and Run everything you have every couple of weeks. Once I stopped fogging, I have never had a problem since. Running up to operating temp and keeping everything moving has got to be better than just sitting. Some pro's may object to this, but, winterizing was invented for people who just put their stuff away and don't mess with it for 6 months. In this case fogging is probably ok. But, as much money as I have invested in all of my stuff, I take the time every 2 weeks or so and run everything I have, and have never had a problem since. If it is too much trouble to run your stuff twice a month, you can expect to have problems 6 months from now when you get ready to use it again. You will find a little trouble a couple of times a month, is much easier then a lot of trouble 6 months from now.
 

dbj1953

Cadet
Joined
Nov 26, 2003
Messages
8
Re: Winterizing

I had a few more thoughts on this subject.We will use my generator as an example. When Hurricane Isabell paid us a visit, many folks around here went to fire up their Generators, no luck. That was surely not the time to have generator problems. Leaving the gas in the carb was the main problem. I work in a refinery, and have been making fuels of all types for 24 years, They do not store well. The main problem, the gasoline had evaporated in the carb and left residue (polymer)which loves to stick to needle valves and floats. After helping some take their carbs apart and cleaning the floats and needles, they ran fine. Gasoline is cheap, if you have a large tank in your boat, use stabil. If you have a small one, use as much as possible and get rid of the rest. Start with new stuff in the spring. I made Amoco Super Prem (water white) for 20 years. And have been using it in my Coleman lanterns for 40. The reason it is water white, NO Polymer, and no deposits left in the carb(I dont use it on a day to day basis, just when I run things over the winter. It's to expensive to use on a daily basis). When it is cold, you need to add butane to gasoline to get it to vaporize (reid vapor pressure)if gasoline sits around long enough, the butane will eventually vaporize out and have a tough time getting it to vaporize properly in the engine. Don't save a few dollars and keep a bunch of old gas around. Use as much as possible and start fresh. Would you want to dring a bottle of water you just got from the store or drink one that had been sitting on the shelf since last year?
 
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