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Threads for drain plug stripped.
Posted: Mon Jun 21, 2021 12:43 pm
by DEnsign32
Greetings. Went to put my drain plug in for launch today and the threads inside hull are stripped. Would have to re tap but how do I go about getting an oversized stainless drain plug? Guy at the Marine store said I could drill out the threads and use rubber expanding drain plug?? Any knowledge of doing either would be greatly appreciated. 73, 32 foot sedan FB.
Thanks!
Re: Threads for drain plug stripped.
Posted: Mon Jun 21, 2021 6:15 pm
by Tuggle
Don't think I would use a rubber expansion plug, measure your current stripped plug and go to the next size up. If it's 3/8 go to 1/2, Lowes-Home Depot both sell tap sets, drill bit and tap so there's no mistake. Aluminum is easy to tap, take your time.
Re: Threads for drain plug stripped.
Posted: Mon Jun 21, 2021 7:12 pm
by Tuggle
Make sure you get an NPT tap, National Pipe Thread.
Re: Threads for drain plug stripped.
Posted: Tue Jun 22, 2021 7:28 am
by Fastjeff
My 19 footer used a 1/2 " NPT drain plug that required a wrench to install and remove. Screw that, I decided and went with a rubber plug. Since it leaked a bit I got out the old pencil grinder with a carbide bit and removed most of the threads. It now seals perfectly.
You might consider that solution (but don't tell anyone!)
Jeff
Re: Threads for drain plug stripped.
Posted: Wed Jun 23, 2021 5:02 am
by DEnsign32
The current plug is 3/4 inch diameter. The logical next size up would be 7/8 but they don’t seem to exist? Next size for tap and plug is 1inch. Going today to measure and see if there is enough material/space for a 1 inch plug...
Re: Threads for drain plug stripped.
Posted: Wed Jun 23, 2021 6:35 am
by Fastjeff
Wow! That's a pretty big tap.
Jeff