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Freeze Plugs, Renew or leave good alone?

Since you cannot see how much corrosion has happened behind the plug, I would certainly replace them while the engine is out of the frame.
 
By all means replace! The reason has already been mentioned. When you get them out, give a look at the backside of them. If you don't, WHEN one of them rests through and starts leaking later on and it's behind the manifold, carb, injection pump, filters, or whatever, you will have wished you would have replaced them now. Jim
 
If your doing it 100% correct you should have the block dipped and magna-fluxed so that also means new freeze plugs. So if your doing a true 100% rebuild yes you need new one and even if your not you should replace at least the ones that are in places that would be hard to replace later
 
Are you meaning the ones on the outside of the block? If you do mean those, unless the pan had sludge or was full of water I wouldn't worry about them. Only an oil gally behind them where the lifters work. You can wash that area out from the top thru where the push rods go as long as it is not full of sludge. You can check for that with a long screwdriver and a light.
 
Just because the outside looks good it doesn't mean the inside looks the same so I'll second the other Wayne. Replace them now while they are out in the open and easy to do or you'll wish later that you did. Too the area around the plugs, be they in a water or oil galley, is often a dead area that rust and other crud can build up in. So, if for no other reason than to insure the water and oil gallies are as clean as possible, it's a good idea to remove them and install new ones after cleaning the block.
 


Well jon,

First of all they are not ( freeze plugs )
they are core plugs. The reason that they are
there is for the foundry to get the sand cores
out of the block after it is cast.

As an engine rebuilder (machine shop ) I
would say replace them. And if you are doing
a true out of frame the core plugs and the
oil gallery plugs will all be removed and the
block cooked in hot tank or at least run
thru a jet cabinet .

george
 
I believe the term "freeze plug" came from the dark ages when folks didn't realize the importance of anti-freeze. When I was a kid, in the summertime dad would run plain water in the old model A, and not put anti-freeze in it until cold weather threatened because they were bad to boil in hot weather. Naturally when someone failed to take preventive measures and the water froze, often the core plugs would push out. I know that it was explained to me by more than one party that was their purpose, to push out if the water froze in order to keep the block from cracking. 'Course it didn't always work that way. We've come a long way haven't we?
 
Initial thought is replace them. But before you poking holes in them to pry them out, make sure you can get what you need to replace them since you didn't say what you are working on. Know what would really stink? Getting them out and ruining them only to discover can't get that size plug. If you can get them, they will be one of the cheapest parts on your list. Often easier to get at them while the engine is out, or at least easier than when its in the frame.

Good luck.

Mark
 
How many $$$ are you saving by not replacing the core plugs?
Are you going to remove the oil gallery plugs and rifle brush the passages?
 
Seriously? You're gonna scrimp on 12 bucks worth of core plugs while you already have it apart? If that's not a case of tripping over dollars to save dimes I don't know what is.

Rod
 
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