Thread on the plug is 13.
Mercruiser 4 3 drain plugs.
Mercruiser drain plugs if you leave the plugs out there is no need for antifreeze but you still want to stabilize your fuel system properly.
Before boats are stowed away for the winter they must undergo a process known as winterization this means that the engine is completely emptied cleaned and antifreeze is applied so that damage does not occur over the cold season.
06 11 2018 06 11 2018 3 comments on 4 3 mercruiser drain plugs diagram.
The mercruiser engine is a popular inboard motor for boats.
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The 4 3 mercruiser engine is a popular inboard motor for boats.