Jump to content
ezeastside

Stripped drain plug help needed

Recommended Posts

ezeastside

In the middle of a restoration on a 1077. The allen key of the  sundstrand drain plug was rounded out and I had no choice but to drill it out.

The 1/4" drain plug has an actual 9/16 - 18 thread. I have that tap and chased the threads out but now its still sloppy and the 1/4" plug will actually thread right into the transmission.

I have searched high and low for a oversize or double oversize drain plug but can't find one in 9/16.

I don't need to split the cases so I can't use one with the nut on the back side and would be concerned about room inside.

 

My next thought is to go to 5/8 18  and try to repair this.

 

Does anybody have a solution to this that would make my life easy?

 

Thanks,

 

ED

Share this post


Link to post
Share on other sites
 
pfrederi

The drain plug hole was tapped for 1/4 NPT (National Pipe Thread) not 9/16 -18.  NPT is tapered 9/16 -18 is straight thread

 

To seal you will need tapered threads or some sort of gasket n a very short 9/16 -18 Bolt

 

EDIT::

Drill the hole out to 9/16"  then buy or borrow a 3/8NPT pipe tap  (Cheapies are abut $10 good ones about $35) and thread it then get a 3/8" plug

 

tap.JPG

Edited by pfrederi
  • Like 4
  • Excellent 1
  • Thanks 1

Share this post


Link to post
Share on other sites
 
R. L. Addison

The drain hole was 1/4 nptf and you put  a machine thread in it. The (N)ational (P)ipe (T)apered (F)ine has a 3/4' taper per foot for the sealing surfaces of the threads. A straight machine thread will not seal because there is clearance at the "root" of the thread, and the o.d. of the thread, on a 75% thread. 

 

 If I was doing I would put in a 3/8' nptf plug with the 3/8' recessed square then there is no hex to round out.

Share this post


Link to post
Share on other sites
 
WHX??

Every two piece transmission I open gets a front drain hole & magnetic plug. 3/8ths NPT.  I use the square head plug and drill a 1/8" hole in it and JB well a cheapy ebay magnet in it.

20151008_175028[1].jpg

Edited by WHX14
  • Like 4
  • Excellent 1

Share this post


Link to post
Share on other sites
 
pfrederi

Nice idea...but for the lazier ones of us:)

 

 

 

plug.JPG

  • Like 1
  • Haha 1

Share this post


Link to post
Share on other sites
 
953 nut

If you plan to mount a tiller or blade (front or mid mount) that requires an axle bracket you will need a plug that ends up flush with the bottom of the transaxle.Hex Socket Plug,Sz 1/8 In,L 5/16 In

  • Like 3
  • Excellent 1

Share this post


Link to post
Share on other sites
 
Achto

Given the fact that you already retapped the hole to 9/16 - 18 I would install a 9/16 bolt with a crush washer (copper or brass). This will seal it up for you.

  • Like 5
  • Excellent 1

Share this post


Link to post
Share on other sites
 
moe1965

A helicoil might be a option.  You can find them on eBay.  Or local parts store might have them. You are given a drill and a helicoil insert that takes you back to the original thread size.  

  

Share this post


Link to post
Share on other sites
 
WHX??

So sounds like we have some answers to your problem Ed.......when we gonna have some  :text-coolphotos: of that 1077 .... bucket list tractor ya know!:lol:

Edited by WHX14
  • Haha 1

Share this post


Link to post
Share on other sites
 
Howie

I do not know if they make a helicoil for the pipe thread. I guess they do, is.   pricey at Fastenal though.

Edited by Howie

Share this post


Link to post
Share on other sites
 
ezeastside

Thank you for all the spot on advice. I went searching for a 9/16 18 x  1/2 bolt for the easy fix but that was unobtainable locally.

I was able to get my hands on a 3/8 NPT tap and stopped at the hardware store and picked up a 3/8 pipe plug.

I will definitely try to get a pipe plug with the recessed square hole but at least I have something to put in for now and get this thing ready for paint.

parts1.jpg.166bee66de7fa6969e8e97f2c61e31b2.jpgparts2.jpg.1b0f309e60461ba9b02cf6d2ba4caccd.jpg

Here are the current pictures of this machine.Trying to get everything in etching primer.

Final paint will be Candy Red urethane that I found in a old post from Rickv.

 

I will do a post in restorations when I get some paint flying... if we can get some good weather.

 

 

 

  • Like 4
  • Excellent 1

Share this post


Link to post
Share on other sites
 
ezeastside

Thanks for the direction

5a8df62ae8a0a_38npt.jpg.ec2aabf7d246f9428c78eb6f40cf774f.jpg

  • Like 1
  • Excellent 1

Share this post


Link to post
Share on other sites
 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...