Resolved 1G Broken transmission mount bolt holes

[1990dsmkid]

Can these be fixed or is this case junk?

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[rabenne]

With my tig skills? highly unlikely. By someone skilled at patching up aluminum castings, sure, why not? I certainly wouldn't throw it away. I've seen worse fixed

 

[1990dsmkid]

I was thinking the back i could drill throught it and use long bolt with nut. The front one though is in the case so thats not an option. If i cant get it welded then only other option i can think of is swapping into and case. I dont know anything about doing that though

 

[rabenne]

If you have another vehicle, take it to the local welding and fabrication shops. If you don't, try emailing them the photos and ask if they would be able to quote the job.

Also, unless you already have one, another case could be hard to come by

 

[1990dsmkid]

I have a trans in the car that needs rebuilt. I bought this one but didnt notice those were broke until already back home. Was in a rush when i got it. I know. My fault. So now im trying to see if i can fix somehow before i attempt swapping internals and possibly messing them up completely

 

[1990dsmkid]

My buddy said he should be able to weld them up and then redrill and tap. Might try this first. Thoughts?

 

[AWD-Tony]

That’s the only way to fix it. It might be easier to have him build up the missing piece and install a heli coil.

 

[1990dsmkid]

Was thinking it would be easier to fill completely and just drill and tap. Trying to just build up what is missing i feel like might be harder but im not a welder so not completely sure.

If i put stainless steel bolt in the holes then weld. Would that be best way to do it without filling completely?

 

[AWD-Tony]

I’m not a welder either but either way will work. The threads that are left looks compromised so I don’t like the bold idea.

 

[1990dsmkid]

Guess ill wait and see what my buddy thinks is best unless others chime in with better advice

 

[rabenne]

Just fill them up, drill and tap. Take care to note the location of the original hole, maybe even make a template that you can use after its welded to make sure you drill as close as you can to the original bolt hole location. It doesn't have to be dead nuts, but accuracy is nice.

For the blind hole you will probably need a "bottoming tap". Typical plug taps have too much taper at the tip and you wont get fully-cut threads down in the base of the hole.

Good luck. Just take your time!

 

[shellhouse]

With my tig skills? highly unlikely. By someone skilled at patching up aluminum castings, sure, why not? I certainly wouldn't throw it away. I've seen worse fixed

Don't feel bad. I'm a certified tig welder, pipe fitter, etc. and weld like crap now. Practice is key. It also helps to have a good AC welder. The primeweld tig is really good for the money and does most of what my thermal arc / esab unit does.

Going to sell my Speedglas helmet but will make a post for it.

 

[1990dsmkid]

Well i finally got around to doing this. I drilled tapped and used helicoils. Have it installed and seems to be good to go. Better then trans i pulled out.