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Veteran
Posts: 100
| Do they make them out of brass and will they retain tension as well as steel? Also what is a perfect install method to prevent from mashing them.
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Expert
Posts: 3031
  
Location: N.W. Fla. | 2 ball peen hammers, round end on the plug, hit with the other. |
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Expert
Posts: 3774
Location: NorCal | While dinging the center of a Welch plug is the common way to install them, it isn't correct. When properly installed, the plug will be flat across without a center ding.
http://www.spriteparts.com.au/tech/welch.html |
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Veteran
Posts: 100
| Great, now where do I buy the 1.625 brass welsh plugs? |
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Expert
Posts: 3774
Location: NorCal | https://www.hubbardspring.com/product/expansion-plugs-brass/ |
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Expert
Posts: 1223
Location: Ramona, CA | I've been going through this same issue with my 300F as a plug fell out behind the motor mount. All the vendors show cup style freeze plugs which won't work. I contacted Melling because they had shallow cup plugs and I hadn't seen those before but those aren't right either. I ended up getting the correct size brass ones for them for both the block and the heads. I ended up using a rubber temporary plug in there for now as you can't get a straight shot at it with the engine in the car, even with the motor mount removed.
The Melling numbers are MEP-12B for the 1 3/8" ones for the heads and MEP-14B for the 1 5/8" ones for the block.
Here is an album of pictures and you will see a picture of old plugs in another block, you can see a ridge in them and how flat they are. I don't know how to reproduce that. I also tried a Dorman copper screw in plug but that didn't work and found out that their new ones aren't very good.
https://photos.app.goo.gl/cvt3DR9HTSU62cvd7
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Veteran
Posts: 117
| To install these I find the proper sized socket that fits the diameter and tap the socket in with a hammer, keeps the freeze plugs from getting damaged and has a solid contact all the way around |
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Disc freeze plugs
