Thread repair help needed

[ebinmaine 67,517]

@admin This is a transmission case but it's a general everyday situation.  

Feel free to move as necessary.  

 

 

I have a transmission case here that someone in the past has installed a VERY crooked shifter holder.  

What do I need to do to fix this?

 

 

 

Here's a closely cropped pic showing the angle as best I can. 

 

 

 

My thought is to remove the bolt and drill out the hole. 

Fill it with JB Weld. 

Redrill and tap to correct size. 

 

 

Yes no?

 

Thoughts comments questions suggestions welcome.   

 

 

Thanks!!

 

 

[John2189 453]

Does it not hold or work the way it is?

[ebinmaine 67,517]

13 minutes ago, John2189 said:

Does it not hold or work the way it is?

The point isn't quite centered.  

[Jon Paulsen 290]

Drill, tap, use next size up bolt?

[ebinmaine 67,517]

4 minutes ago, Jon Paulsen said:

Drill, tap, use next size up bolt?

It's already WAY oversized. 

That's why I was thinking more like fill and start over.  

 

 

[wallfish 17,000]

JB Weld won't hold threads very well

How about threaded inserts/rivets? Very handy tool to have around and many useful places to use them.

Heliciol insert maybe?

Yes the hole may need to be bigger but now you can down size the dogpoint

 

https://www.amazon.com/s?k=rivet+threaded&adgrpid=1339205735366040&hvadid=83700598720095&hvbmt=be&hvdev=c&hvlocphy=51385&hvnetw=o&hvqmt=e&hvtargid=kwd-83700723113539%3Aloc-190&hydadcr=5102_13196128&tag=mh0b-20&ref=pd_sl_yeaorb6x7_e

 

https://www.amazon.com/s?k=helicoil+kit&crid=1SFGGY4MW8ES7&sprefix=helicoil%2Caps%2C103&ref=nb_sb_ss_ts-doa-p_1_8

Edited November 9, 2023 by wallfish

[WHX?? 48,820]

Helicoils? Not sure if you can stack them. 

[ebinmaine 67,517]

6 minutes ago, wallfish said:

JB Weld won't hold threads very well

How about threaded inserts/rivets? Very handy tool to have around and many useful places to use them.

Heliciol insert maybe?

Yes the hole may need to be bigger but now you can down size the dogpoint

 

https://www.amazon.com/s?k=rivet+threaded&adgrpid=1339205735366040&hvadid=83700598720095&hvbmt=be&hvdev=c&hvlocphy=51385&hvnetw=o&hvqmt=e&hvtargid=kwd-83700723113539%3Aloc-190&hydadcr=5102_13196128&tag=mh0b-20&ref=pd_sl_yeaorb6x7_e

 

https://www.amazon.com/s?k=helicoil+kit&crid=1SFGGY4MW8ES7&sprefix=helicoil%2Caps%2C103&ref=nb_sb_ss_ts-doa-p_1_8

 

Just now, WHX?? said:

Helicoils? Not sure if you can stack them. 

 

 

I'm seeing the idea here.   

 

I'd have to go REALLY big though. 

The bolt is already too big. And crooked.  

 

Is there a different compound/product/repair product I could use or do?

 

I wouldn't be very likely to pay to get it repaired because a good used case would be cheaper. 

 

That said, this is a low hours unit with great gears and if like to save it.  

 

 

[953 nut 55,250]

My suggestion would be to silver solder (hard solder) the hole to a slightly smaller size, drill it out to 13/64" and tap to 1/4-20. The threads don't have to withstand a great deal of force so the silver solder threads will hold fine.

[wallfish 17,000]

8 minutes ago, ebinmaine said:

I'd have to go REALLY big though. 

3/8 hole for a 1/4-20 Cover it with a shift boot and you will be the only one that knows about it.

Looks like it might a 3/8 hole in there now

You can try just running a tap through it but keep it straight

Some threads may be boogered but not like it's holding something supper hard. Maybe JB Weld could be used just to fill in some of the missing gaps in the threads. IDK if it's even necessary

Edited November 9, 2023 by wallfish

[ebinmaine 67,517]

4 minutes ago, wallfish said:

3/8 hole for a 1/4-20 Cover it with a shift boot and you will be the only one that knows about it.

You can try just running a tap through it but keep it straight

Some threads may be boogered but not like it's holding something supper hard. Maybe JB Weld could be used just to fill in some of the missing gaps in the threads. IDK if it's even necessary

 

I'd have to measure the current bolt. 

It's already ⅜ I'll bet.  

 

[Achto 27,577]

21 minutes ago, WHX?? said:

Helicoils? Not sure if you can stack them. 

 

Probably not ideal to stack them, they do make them in different lengths though.  

[Horse Newbie 7,070]

31 minutes ago, WHX?? said:

Helicoils? Not sure if you can stack them. 

Yes, you can stack them.

I was thinking I have done it before, according to their own instructions…

[Achto 27,577]

11 minutes ago, ebinmaine said:

I'd have to measure the current bolt. 

It's already ⅜ I'll bet.  

 

if the hole is already 3/8", a Helicoil would not work. 

 

Here is one idea. Thread a grade 5 or less 3/8" allen bolt into the hole and tighten it down. Use some green Loctite sleeve retainer to make sure it is a permanent fixture. Let it dry over night.  I suggest an allen bolt because I don't think there will be enough room to tighten down a 9/16" head on a regular bolt. After the Loctite has dried drill a new hole through the bolt and tap it 1/4-20. After you tap the hole, grind the head off from the allen bolt. Should be a permanent fix. 

 

No guarantee but should work. 

[kpinnc 12,064]

Before I used JB weld, I'd have a nut brazed on. It would outlast JB weld, and be quite a bit stronger. 

[gwest_ca-(File Mod) 11,046]

An Allen head socket cap screw is usually Grade 8 material so very hard to machine.

[Wild Bill 633 846]

@ebinmaine

I recommend using an E-Z Lok threaded insert. The 1/4-20 internally threaded thin wall insert has an external thread of 3/8-16 and the standard wall insert has an external thread of 7/16-14. Then use a 1/4-20 X 3/4 long dog point set screw for the shifter.

Edited November 10, 2023 by Wild Bill 633

[WHX?? 48,820]

Really good idea Dan ... now you know we pay you... 

Easy peasy if the tranny is off frame. 

Can be found in the Hillman drawers mild steel @gwest_ca

I've got a three piece RJ tranny that needs this fix. 

Have to look those up @Wild Bill 633... not familiar. 

Edited November 10, 2023 by WHX??

[JimSraj 430]

Hope you let us know what you decide to do and how well it works out for you.
For what it’s worth, I like achto’s idea. Most likely need to flush up the inside as well once the loctite sets up. 

[ebinmaine 67,517]

6 hours ago, JimSraj said:

Hope you let us know what you decide to do and how well it works out for you.
 

 

I'll try to remember to post what I do here. 

 

[Retired Wrencher 5,459]

Eric this holds the shift lever in place? I have a few of the set screws I can send up with the carb!

[ebinmaine 67,517]

55 minutes ago, Retired Wrencher said:

Eric this holds the shift lever in place? I have a few of the set screws I can send up with the carb!

I've got some here too. But I'd like to see what you use.   

[953 nut 55,250]

11 hours ago, gwest_ca said:

An Allen head socket cap screw is usually Grade 8 material so very hard to machine.

    If a hardened steel or grade 8 item is heated to red hot and allowed to cool slowly it can be drilled and tapped.  I have done this with broken or stripped out Allen Head set screws.

[Pullstart 62,900]

I’m pretty late to the party, but I was thinking the same as Dan.  Loctite a bolt in there, then drill and tap a new hole.  

[ACman 7,618]

… that what I was thinking too before I read Dan’s post and beat me to it . Good luck on your venture .