Mercruiser 5.0 Liter water drain plugs

Scotyp

Member
Oct 4, 2017
59
Boat Info
2001 Sea Ray 340
Engines
6.2 L Mercruisers
New to Bowrider 210 last Fall and this is my first de Winterizing season. As it relates to the 5 blue wing nut water plugs on the engine and manifold: They screwed back in the plug holes easy enough. Lacking a little confidence I put them in the right places! They are sometimes tough to find! Are there any "fake" drain plug holes I could have put them in or is there just the right number of drain plugs for drain holes that fit only them? Photos would be of help! Any assistance appreciated!
 
Nope. You're good. You'll know for sure when you run it - no leaks and all is good! :) Do it enough and you can remove and put them back in blindfolded.

Photos? If you want, post pics for us to look at.

FYI, why were they out over the winter? Didn't you put anti-corrosion, non-tox antifreeze in?
 
Ok will try and post some thanks! I didn't put antifreeze in the block on the recommendation of other boaters here and Winter weather in Seattle is pretty mild. Cheers!
 
Best practice is to use the AF and this is the most common thing recommended here on this forum - the interior of the block and manifolds will rust if left to the air. It's not the end of the world, but again, "best practice". Plus, it ensures all leftover water (some does stay inside) is either pushed out or greatly diluted.
 

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