Engine Block Coolant Plug Problems

I removed the engine block coolant plugs on my 1987 D150 318. The plug threads were pretty chewed up, and now I can't get them to thread back in! I'm plugless and stuck. I've heard they're 1/4" NPT pipe fittings. I bought new ones and they barely thread half way in. I think I need to tap the threads, but don't know if I can use an SAE tap. Can anyone help so I can get this truck running again? Thanks!

I removed the engine block coolant plugs on my 1987 D150 318. The plug threads were pretty chewed up, and now I can't get them to thread back in! I'm plugless and stuck.

I've heard they're 1/4" NPT pipe fittings. I bought new ones and they barely thread half way in.

I think I need to tap the threads, but don't know if I can use an SAE tap. Can anyone help so I can get this truck running again?

Thanks!

Wed, 05 Jul 2023 14:15:03 +0000
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