3/4 NPT Drain Plugs


S

SabrToothSqrl

Well-known member
what is everyone servicing their drain plugs with? When on the trailer - the plugs (3) are out, so for me, 2x a year or once I guess depending on how you count it.

Mine are old and nasty, I saw the Born Again Boater guy cut strips into his plugs, so he could use one as a tap to clean out the plug holes, and I thought.. that was clever. but an actual tap set is $10, so I did that.

Is anyone wrapping their drain plugs in teflon? I usually just coat mine in Quicksilver grease so they are easy to remove in the fall. It's on a lift, so while any water throgh the plug isn't the end of the world - any water leak is bad. I don't know if mine have ever leaked, just curious if anyone tapes them or just coats them w/grease like I do.

I'm going to run a tap though mine since they are so nasty, and get new plugs.


and yes, technically a thread chaser or rethreader is the correct tool, but used 'softly' these work just fine.

 
I never had to clean any threads as I coat them in the spring with never seize copper. Both stay in all year and come out without issues.
 
I would not use a Tap to clean the threads. A Tap is designed to cut threads, not chase threads, and a NPT Tap as you know gets larger the further it goes in. Do it enough and you may need to replace the garboard

I might use a round wire brush like one used for battery terminal or copper pipe cleaning. Cutting slots in one is also ok so longs as it's brass or aluminum
 
I was gentle ;) a battery terminal thing might work if it was cleaner. I had chased an unknown oil/grease leak for 3-4 years now (I think this time its finally good). I just turned it by hand in and out a few times. much cleaner now.

Fun fact: the plugs are 1/2". I measured them as 3/4" but the new ones are huge! why is everything a lie?!
 
i think they were from the factory, but I replaced the engines and removed the oil drain hose. I use a jabsco bucket thing to pump out the oil.
 
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