The old oil will contain a bunch of contaminants and harmful acids by the end of the season. You don’t want to let it sit there all winter working on your engine and transmission. If you have a freshwater cooled engine, change the antifreeze. I understand the antifreeze doesn’t wear out but it has several kinds of corrosion fighting additives that do.
you can pump the pink anitfreeze (nontoxic) through the engine, have someone at the back to catch it in a bucket so it doesn’t go in the water and then shut off the engine as soon as it starts to pump out the back.
Be sure to bleed your your fuel line to remove any air caused by changing your fuel filter. Turn the ignition key to pump the fuel through the lines but don’t try to turn over the engine. Have a rag handy to catch the fuel.
Of course, the last thought here has to be this. Once you winterize your engine Neptune will chuckle because Murphy’s Law prevails! You’ll get a day of really nice weather…. Oh well, sit in the cockpit and have a nice lunch. As always, if something doesn’t make sense check with your local diesel mechanic. If you found this helpful please click on the help out button below, thanks!
Find more articles about winterizing your boat ‘here’.
2 Comments posted on "How to winterize a marine diesel engine"
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