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Old 05-28-2014, 07:31 AM   #15
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If you have a Atwood water heater call Mark Albrecht at 574-266-4706 , he is a customer service representative. He can help you, he is very knowledgeable and will tell you how to fix your problem. He's helped me in the past.
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Old 05-29-2014, 07:07 PM   #16
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Quote:
Originally Posted by nothermark View Post
The plastic drain plug is roughly an inch in diameter thus probably 3/4 IPT. Given that one can find a tap cheap there is still the problem that the nylon plugs still often bottom without sealing so opening the hole a bit more still leaves one with a leak. That assumes the hole is not already oversized. If it is one can also go to something like a heli-coil thread repair but the end result will always be a lot of time and a lot of money compared to an expandable rubber plug made for hot water use. Even if you toss a plug a year break even will take a while.

The one other thing I might try is to check the size and buy a metal plug that size and see what happens with some teflon tape. Less than $10 for a reasonable last ditch try. The reason I think that might work is the stronger threads on the metal plug compared to the plastic.
I'm thinking that whatever the size is, all it needs is the threads chased with a tap. I don't think a heli-coil would give a good repair in this case either. I would go with a brass replacement instead of plastic, but that's just me, The rubber plug might work out OK, but it's just not how I roll.
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Old 05-30-2014, 06:56 AM   #17
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The problem with how you roll is the construction of the tank. At least the one's I have seen have a ring welded or formed into the tank wall where the plug goes. As you increase tap size you decrease the wall thickness of the ring that was put in to beef up the tank wall and get a flat section to tap. It you were talking a flat sheet of metal I would agree with you but When you reduce that wall thickness you are treading into another failure mode. That is the problem with helicoils to some degree and a larger pipe size to a larger degree.
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Old 05-30-2014, 08:23 AM   #18
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Usually, when designing nut/bolt type assemblies, (Pipe/fitting applies) they choose metals so the less expensive one strips. thus thread chasers and a new "lower cost" item fix it..

So the most likley and if Atwood the only condition is the plug is stripped, not the tank, a thread chaser to clean the threads and a new plug will fix it.

OF course if someone screwed in a metal plug.. this may not be the case.
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Old 05-30-2014, 08:31 AM   #19
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Mine was leaking and I tightened it down, then it blew out under pressure. I believe it is made to blow if pressure is too great. I used a brass plug temporarily until I could get the OEM plug. The OP doesn't say how he knows the threads are bad, I'm guessing they are not, based on the experience I had. This was also before I bought a pressure reducer at the inlet.
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Old 05-30-2014, 09:32 AM   #20
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The problem with how you roll is the construction of the tank. At least the one's I have seen have a ring welded or formed into the tank wall where the plug goes. As you increase tap size you decrease the wall thickness of the ring that was put in to beef up the tank wall and get a flat section to tap. It you were talking a flat sheet of metal I would agree with you but When you reduce that wall thickness you are treading into another failure mode. That is the problem with helicoils to some degree and a larger pipe size to a larger degree.
There's no problem with 'how I roll'. "How I roll" is making an attempt at a proper repair before giving up.
I never said anything about increasing the hole size, you're getting posts confused or something. I don't know why you're so stuck on that.
All I recommended was to chase the threads that already exist. There is no increase in hole size if you use the same size tap.
With that said, it may or may not work depending on the damage of the sleeve in the tank. For 10 or 15 bucks, It would seem worth a try to me.
If it doesn't work, then go to the rubber plug idea.
Remember, the goal here is to help the OP and give suggestions, not to become combative and argumentative, that is not the purpose of this forum and the end result really helps no one.
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Old 06-01-2014, 06:08 AM   #21
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Available on AMAZON, Atwood 91857 two for $6.46 PRIME.

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