How to winterize a 4.3l Mercruiser in a 1999 Tahoe Q5L

[ghardy7605]

Hi, I am a newbie to I/O engines, can someone tell me the correct way to winterize the 4.3l engine and alpha one outdrive, or if someone knows the link to a good video, would be greatly appreciative, don't want to ruin the motor over the winter, or would I be better off paying someone to do it?

Thanks in advance,
Greg

 

[Bt Doctur]

Basically you flush and fog the motor until it stalls thru the carb or if injected thru a remote tank with a winterizing mixture
Remove all the drain plugs, probe the holes to insure drainage
Fill with a product that will keep the cast iron from rusting or leave everything dry,your choice
Check outdrive oil for level and condition, and remove drive for service,
Replace impeller if over 2 years for Alpha1 and 4-5 years for Alpha GEN II

 

[ghardy7605]

Thanks for the answer..........

 

[porscheguy]

Don’t buy one of those winterizing kits that purports to feed antifreeze in through the outdrive. They’re a recipe for a cracked block in the spring. Don’t take shortcuts.

 

[H20Rat]

Why are you talking about winterizing in July? stop it, don't do it!

Also, fogging is a somewhat debatable topic. I grew up in/around boats since a very early age. Owned 2 different boats before I ever had a car. I didn't know of fogging until I found this forum, and yet all my engines (many, many boats, ATV's, snowmobiles, mowers, etc...) survived without a drop of fogging oil.