Passenger side motor mount thread in frame stripped - The Saab Link Forums

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Old 09-29-2014, 04:31 AM   #1
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Passenger side motor mount thread in frame stripped

I unfortunately believed I stripped the threads inside the frame for the motor mount bolt closes to the front if the car. Anyways I have 2 ideas and what to know what you guys think is the better one.
1. Re tap with correct size heli coil kit or a the next size up. Anyone know this bolt thread size? This is the mount on the motor side or if ur looking at the front of the car it's on the left.

2. Take a punch and poke it through so I can see where to drill. Then take a long bolt put it through and put a nut on the other end?
Any help or insight will be greatly appreciated!
Grr I was just justing a rachet too..
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Old 09-29-2014, 02:24 PM   #2
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I haven't been in this area of my ng for a while so some of what I say may not apply. First check and see if the bolt is not inserted through a slot somewhere. I know some on the 9-5 are, and they are actually removable.

If that's a no, I'd first run a tap of the stock size though that insert and see if it is salvageable. Then use a new bolt and an adhesive and see if it tightens down.

If that is a no can you break it put and put in a regular nut? I punched one out on the 9-5 and was able to slide a nut back there with a wrench and then tighten it up. It wasn't easy.

If all that fails then try your heli coil, or the next size up thread. In my experience there isn't much to these nut plates, there may not be a lot of material.

Consequently I always reinstall these with anti seize. They get a lot of abuse being so low on the car.

Last edited by Tboy; 09-29-2014 at 03:04 PM.
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Old 09-29-2014, 02:58 PM   #3
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I'd go straight to the helicoil.

If you end-up using some anti-seize, make sure you de-rate your torque values to account for the lubricative properties of the anti-seize. Guess how I learned that lesson lol.
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Old 09-29-2014, 05:50 PM   #4
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That's guys it's defiantly stripped. Is a tap just trying salvage the existing the threads? And a heli coil is actually putting a new thread in? Does any one know the size and thread pitch of this bolt? Or where I can find it?
Thanks Connor
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Old 09-29-2014, 06:23 PM   #5
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Tap would be to salvage the threads. Helicoil will cut larger (will have to drill it out to proper diameter) then tap for an insert.

I can check tomorrow on what size it is.
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Old 09-29-2014, 07:14 PM   #6
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Tap would be to salvage the threads. Helicoil will cut larger (will have to drill it out to proper diameter) then tap for an insert.

I can check tomorrow on what size it is.
Thank you very much I really appreciate it!
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Old 09-29-2014, 07:45 PM   #7
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It's M10x1.25, and there's a slot in the frame where you could conceivably run a longer bolt through and get your fingers on a nut. I'd still helicoil if you can.

The picture is taken laying on the ground looking up at the frame rail, engine removed. You can see the two holes where the bolts mount, left is towards the front of the car, horizontal slot is above and in-between the two mount locations.

https://www.google.com/search?q=M10x...ead+repair+kit



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Last edited by Drew in Houston; 09-29-2014 at 07:54 PM.
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Old 09-30-2014, 08:09 AM   #8
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It's M10x1.25, and there's a slot in the frame where you could conceivably run a longer bolt through and get your fingers on a nut. I'd still helicoil if you can.

The picture is taken laying on the ground looking up at the frame rail, engine removed. You can see the two holes where the bolts mount, left is towards the front of the car, horizontal slot is above and in-between the two mount locations.

https://www.google.com/search?q=M10x...ead+repair+kit



Thank you for that! I ordered a helicoil kit off eBay today so hopefully it works. The kit only come with the tap and no drill bit. Is that fine? I read ur suppose to drill it out first? Is that only if your making it bigger?
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Old 09-30-2014, 09:14 AM   #9
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No you'll need to drill it out for sure. The kit you bought should tell you the size bit that you'll need.
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Old 09-30-2014, 02:51 PM   #10
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Ok well from searching what size bit u need for m10x1.25 is 11/32 so I just need to pick a metal cutting one up. Kit should be here Friday or sat so hopefully have it all done this weekend. One last thing should I get cutting oil or is that not really needed?
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Old 02-18-2015, 07:22 AM   #11
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Hi, i am new on this forum.

Sorry for reviving this topic but i found it when i did a search on google.

This problem happened to me a few days ago while i was changing right front engine mount on my 9-3 aero. I cross threaded bolt closer to the front and i believe i have ruined the threads.

I have already tried to fix them with a m10x1,25 tap and the bolt goes in nice but when trying to torque it with torque wrench it just spins in the hole.

I drive the car anyway but it does have excess vibration because this bolt isn't tight enough.

I am interested if condaddy managed to fix his and if its even possible to helicoil it, i have good experiance with the helicoil but i am afraid that when i will start to drill a hole the nut which is welded in the frame will just spin off...or if there is even enough "meat" to put the helicoil in the nut.

Thank you for your help guys i am really mad at myself...

Last edited by hemy; 02-18-2015 at 07:24 AM.
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Old 02-20-2015, 12:50 AM   #12
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Anyone?
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Old 02-20-2015, 07:50 AM   #13
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Been a couple of years on a 9-3, can you reach the bottom of the nut? Get a longer bolt and see if you can get a nut on the bottom.

When you say that it won't torque, is the nut loose or are the threads blown out? If the nut is spinning, can you tack it with a welder? If the nut is being held securely, helicoil it.


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