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Stripped thread - AU gearbox mount 

 

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 Post subject: Stripped thread - AU gearbox mount
Posted: Thu Jun 11, 2015 3:56 pm 
Getting Side Ways
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HI everyone,

I have an AU XR8 which has had a manual conversion. I noticed when dropping the back of the gearbox to do a short shifter installation that I have a problem...

The threads on the gearbox crossmember (passenger side) have been damaged. When I do them up, they wont lock tight, slip on the thread and loosen. It seems the threads have been partially stripped I guess.

My question is what can I do about it? Where do these actually bolt into? THe chasis? Floor?

Could I retap the thread? Any suggestions would be great. Its not a big issue at the moment but will need to be fixed obviously.

Thanks!
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Thu Jun 11, 2015 10:06 pm 
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IMO you need to tap a thread for a slightly larger hi-tensile bolt. If you go to Total Tools or All Tools, they can supply you with the bolts. Buy a suitable tapered tap off eBay.

 

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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Sun Jun 28, 2015 4:19 pm 
Getting Side Ways
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I finally got to have a look. There is basically a thread inside of the sub frame of the car. These have been stripped...

All I can think of is a tap or a helicoil? Can these threads be accessed from inside the car at all?
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Sun Jun 28, 2015 7:16 pm 
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helicoil from underneath

the kit will come with the correct tap

the only thing i can think of is the thickness of the metal in the chassis
as you have to drill out the old thread ( with the correct size drill bit ) and then re tap that

 

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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Sun Jun 28, 2015 8:08 pm 
Getting Side Ways
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I was wondering about that too. I cant find any information on it. There must be a way to fix it. It is very common on alot of cars (google search) just not our falcons.

I also wonder if I could hole saw drill a small hole in the floor and run a whole new high tensile nut and bolt through the hole, removing the thread system all together..
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Sun Jun 28, 2015 8:11 pm 
Getting Side Ways
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Could I just put some spot welds on the edges of the bracket to the floor and neatly use an angle grinder to remove them if I have to remove the crossmember?
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Tue Jun 30, 2015 6:37 pm 
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Seriously i would say just re tap the thread.
A bolt and nut.. just a bad idea.
Welding it.. why?
just tap it
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Tue Jun 30, 2015 9:05 pm 
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Is there enough material in the floor rail though? That has been a worry of a few people as above.
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Tue Jun 30, 2015 9:22 pm 
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Well you won't be drilling that much larger. I think they're m10 bolts or something so just go up to m12 it's only 2mm more radius
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Wed Jul 01, 2015 9:20 am 
Getting Side Ways
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Yeah thats fair enough. I was told that because it was converted the underfloor structure may be different and therefore less material but no one can confirm it. I agree a retap or helicoil would be nice and easy. Just dont want to risk having them fatigue and fail.
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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Wed Jul 01, 2015 9:50 am 
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Is AU different to EL where there is a 'nut' in the rail that can be replaced?

 

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 Post subject: Re: Stripped thread - AU gearbox mount
Posted: Wed Jul 01, 2015 10:01 pm 
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If there is a but, I can't see a way to get too it without cutting into the floor skin from the inside.
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