Fitting a "freeze plug" question - Steel Soldiers::Military Vehicles Supersite

cranetruck · 04-08-2009, 09:37

What is the proper clearance for a freeze plug or cap in this case, before wacking it with a hammer? I need a solid fit and the cap will be drilled and tapped for a vent after installation.
The 2-1/16 cap is too large, so I'll have to grind it down to fit. The next smaller size cap that I can find is 2 inches in dia and is too loose.

Edit: Added image....

doghead · 04-08-2009, 10:11

What is the measurement of the hole? There are several types of plugs, cup concave, etc.

Try Dorman Products? https://www.dormanproducts.com/cgi-b...list=1454:22:0

My local NAPA has a decent selection in stock.

cranetruck · 04-08-2009, 10:20

Fair question, it's 2.025

Image shows what it should look like when finished.

Edit: Added image.

doghead · 04-08-2009, 10:38

That looks like a concave disk. Did you remove the old one?

I found one that says it's 2.020" at my NAPA. It is either a Clevite or Dorman brand. They said the next size up was 2.062"

I can get it and send it to you if you think it will work.

cranetruck · 04-08-2009, 11:01

Thanks Eric, I'll check with my local NAPA. The original was destroyed when I removed it....

jwaller · 04-08-2009, 15:39

freeze plugs that I drive into the engine blocks go it with a moderate swing from a 3lb hammer. I'd say you want at least .002 of interference fit at 60deg F. yours can be a bit looser bc your not sealing water at 16psi over a 2sq in area.