Links for winterizing a Mercruiser 470.

[jerryjerry05]

My brother (in Mi.) needs to winterize a Mecruiser 470.
When I moved to Fl. He lost contact with the only one around who could do it for free!!ME!!
He's fairly mechanical and can use a computer.
Any links to winterizing a Mercruiser.The one Merc. made?

Thanks,Jerry

 

[Eric 3.7LX Alpha 1]

Re: Links for winterizing a Mercruiser 470.

In a nut shell:

 

[stonyloam]

Re: Links for winterizing a Mercruiser 470.

All you have to do to freeze protect it is: Make sure the antifreeze (the automotive antifreeze in the engine) is about 50/50 (you DO NOT drain the block). and remove the aft drain plug from the heat exchanger. Make sure all of the water drains out of the exchanger by poking up through the plug hole with a piece of wire. That is it, done! After the raw water is out of the exchanger the winterizing procedure is similar to any other engine. All I do is put some Stabil in the gas and turn it over (not start it) a couple of times in the off season to keep the cylinder walls lubed.