cub

[haw river cub]

I have a 49 cub and i went to drain the coolant and discovered that the hole where the drain plug goes is
stripped out. The previous owner had wrapped enough teflon tape around the plug to make it stay. I aint
doing that. What do i do now ? Any suggestions, please.

 

[Janicholson]

This will work if th threads are just abused. Use a pipe tap to chase the existing threads a little deeper than they are now, maybe 1/8 inch farther in with the tap. then use a new pipe plug and the tape so it follows the threads and goes in deeper. You could use a short (close nipple, and epoxy it in place. Then use a pipe cap on that nipple. The expander plug shown in the link is another solution. Jim
Expansion plugs will work.

 

[used red MN]

I am not sure what size of pipe thread a Cub has but my best guess would be 1/4 inch NPT, so if a 1/4 tap does not clean the threads to seal then drill it to tap to 3/8 inch, 3/8 to 1/2 if needed. Sorry I have no idea of how accessible the drain plug location is. Actually, the rubber expansion plug Jim mentioned will work fine.

 

[haw river cub]

Thanks, i like the expansion plug idea since its a non pressure system.The hole is stripped smooth all the way.

 

[DaveBN]

You can buy weld in bungs, so drill it out and have a radiator shop weld or solder in a new bung.
Dave

 

[BarnyardEngineering]

There should be plenty of meat to go up to the next size NPT plug. If you have the NPT tap or know someone who might have one...

Ideally you'd have the tapered reamer.

 

[rustred]

dont suppose u remember the old thermoses used them plugs too. no threads.

 

[Jim Becker]

I'm not so sure about having meat enough to go up one size. There isn't a lot of extra material in that area. A close look at the casting is called for and should easily answer the question either way.