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Installing freeze plugs

3

37chief

Well-known Member
Location
California
When installing a freeze plug (not the cup type) The other type that look like a large coin slightly concave looking. When they are in the block hole how much do they need to be hit to expand in the hole. I have done a lot of cupe type, but not the large flat kind. Thanks, Stan
 
I had some in a forklift engine I was rebuilding. I put them in the bare block I was afraid to tap too hard as the block seemed thin and I didn't want to crack the block. Well once all together and running they started leaking. I then grabbed a very large piece of rod and a BFH and gave them all more pounding and then got them to seal. With coolant in the engine the block didn't sound so tinny and plus being po'ed help too !
 
Technically, Owen is right, but Mike got the right idea. I think years ago they seemed softer metal, these need to get a couple good wacks with the round end of a 2 pound ball peen. Enough to put a dimple in the middle, then stop. I figure they are like reloading ammo, you certainly want to get it right the first time. Clean the ring of cast iron good with a scraper first too.
 

I think the flat ones are called "Welch Plugs"..usually used at the rear end of the cam opening on a V-8, among other places..
I would opt for the shallow "Freeze Plug" with a lip around the circumference..
I always coat the entire back side and edges with non-hardening Permatex to reduce rusting and to help with sealing..
Ron.
 
I did.

I just didn't whack them hard enough at first for fear of cracking the block. They really need to be flattened !
 
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