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How To: Winterize 2007 150 optimax OB

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How To: Winterize 2007 150 optimax OB

Old 09-06-2019, 05:45 AM
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Default How To: Winterize 2007 150 optimax OB

Good morning,

I have a new to me twin 150 optimax 2007. I had i/o's for years just wanted to know what the correct way to winterize my lady this winter is. Any help would be much appreciated.

Thank you
Old 09-06-2019, 05:48 AM
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where are you? How cold does it get?

They self drain when tilted down. I am in VA and it does freeze here, for 30 years w outboards I change lower unit oil and just add fuel stabilizer. I used to fog the engines but we boat up through thanksgiving and start back early spring so I feel it was unnecessary.
Old 09-06-2019, 05:50 AM
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I live on Long Island, we hit -15 -20 a few days over the winter
Old 09-06-2019, 06:17 AM
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Grab a beer
Stabilize fuel and run the engine preferably on the last run of the year to get a good mix
replace fuel/water separator
grease every fitting
remove prop, clean shaft, re-grease and install prop or send out for repair
replace lower unit oil
remove each plug and put about 1/2 - 1 teaspoon of opti oil in each cylinder. Install plug. I use a small 1/4 round hose, drop 1 end in the opti oil container, put finger over the other end, insert in each cylinder and release. Eye dropper will also work. For whatever reason, fogging is not recommended. I think fogging directly into the cylinder would also work as Merc probably doesn't want fogging at the air intake. I stick with the eye dropper method.
merc recommends manually turning the flywheel. I might turn the key if the impeller is still wet...... maybe
spray and clean the engine with CRC, not WD40
grab another beer

Old 09-06-2019, 06:40 AM
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hahaha awesome thanks
Old 09-06-2019, 07:01 AM
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Up here in Michigan, winterizing is a must for most... On my outboards, I always shut the fuel line off and run both engines till they quit. Next, I pull the plugs, fog the carbs, turn it over and the pull the battery. I will add Stabilizer to the fuel tank, change lower end unit oil and that's about it. On my 4 stroke kicker, I will also change the oil too. In the spring, I usually change plugs, but not always...
Old 09-06-2019, 07:39 AM
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If pulling plugs just be aware that the lower ones are not easy to access on that motor. Can barely do it without removing lower cowling (and if you don't you need to be super careful re cross threading on reinstall), and removing that isn't a picnic either in terms of access to the bolts, the lower rear one isn't easy. This thread, where I dropped a plug and had to figure out how to remove, has some good info on how to do it and on cleaning the screens etc while you are there. Dropped spark plug into outboard and can't find, what now?
Old 09-06-2019, 07:48 AM
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When I got the boat surveyed in the spring the #6 cylinder had bad threads and could not do compression on that cylinder. The other 11 were at 133-135 had the engine scoped, thermal imaging sea trialed, etc. The owner did have that engine pulled and had the hole re threaded the right way at mechanic of my choice. Purchased the boat couldn't be happier. I know its a pain to get at those bottom ones. Thank you for the heads up on that, If I didn't have the boat fully checked I would of never known that.
Old 09-06-2019, 07:56 AM
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I would just start with whatever you did to winterize your IOs, adjust accordingly for OB, then hang out out of sight for a couple hours from wife/kids enjoy a couple beers and a game while you pretend to still be winterizing.
Old 09-06-2019, 08:00 AM
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haha yess
Old 09-06-2019, 08:07 AM
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The bottom plugs. A tool exist for every problem. I assume you can't get that spark plug socket and handle in easily. Put a small dab of grease on the threads b4 insert and get yourself 1 of these.



Old 09-06-2019, 09:49 AM
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Originally Posted by 2LBI View Post
The bottom plugs. A tool exist for every problem. I assume you can't get that spark plug socket and handle in easily. Put a small dab of grease on the threads b4 insert and get yourself 1 of these.



Looks handy but unless that head multi-articulates (doesn't look like it from the side view) it won't fit in enough to get the lower left plug by my recollection.
Old 09-06-2019, 10:15 AM
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Hmmmm. I have a 90hp opti and must not have the access issue you have in the corner
Old 09-06-2019, 10:22 AM
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Wow just looked it up. What a bitch. Have u seen this?

Optimax spark plug replacement without removing cowling instructions
Old 09-06-2019, 10:24 AM
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Store it trimmed down and store batteries indoors w/trickle charger... that's it.

My Opti spent 3 winters stored that way in northern Minnesota. Keep in mind, we would see weeks on end of a maximum temperature of -5 degrees. It fired right up at Walleye opener ever year (usually first week of May).
Old 09-06-2019, 10:39 AM
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I think 2LBI nailed it. I can get to the lowest port plug on my Optimax 150 with a UJ between the socket and the drive.
i keep stabiliser in the fuel all the time as you never know what might happen to cut your season short and have fuel left in the tank.

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