Gear box carrier plate

[Sens]

Hello Pagode friends!

I have put the engine back in my Pagode and all went well!

I was going to mount the gear box carrier plate with the 12 M 10 bolts.
Quite an important plate since it supports part of the weight of the engine/ gearbox.

However I noticed that 4 of the bolts  had a bad thread and I was not able to tighten them. The steel is in good shape; not rusted or anything.
They must have been over tightened in the past I guess. I tried some new bolts, but same result.

Would a helicoil be the best solution to solve this problem?

Thanks for your advice!

Halvor Sens

[Kevkeller]

Did you try a rethreader or a tap in the nut ends?

[Sens]

No, I did not yet.

But would that "repair" the thread?
I am afraid I miss some metal in the tread.

I do have that M10 tap, but do you think that could help me?
It would be by far the easiest solution.

[dirkbalter]

If it is the bolts, you can just get new bolts. Cheap. In my case, the nuts that are tacked to the tunnel were bad and after re-tapping them, they would not allow me to apply torque without stripping. I had to replace 4 of them.

[Sens]

Thanks for your comment!

In my case the problem is caused by 4 nuts, like in your Pagode, Dirkbalter!
And yes, I tried new bolts.
Putting new nuts is looks complicated; how are they accessible?

The helicoil solution could be a good alternative, I guess.

[dirkbalter]

They run along the left and right side of the tunnel bottom . With the carpet and insulation out, you should see them from inside the cabin. I was surprised how flimsy they were. After cutting them out, I tack welded regular M10 hex nuts in place, using the trans mount plate as a reference.

[Sens]

Oh! That is excellent news!

So they are accessible from the cabin after removal of the carpet and insulation! Fantastic!
That is a very good solution!

Thanks!

[Pinder]

could you use a larger tap and retap them?

[Sens]

Yes, but according to dirkbalter these are flimsy nuts, so making a bigger hole might be risky.

I think tacking new nuts in would be the best solution!

[Pinder]

That is true.  But maybe worth a try and if it fails then you can remove the carpet.

Regards

[dirkbalter]

These are the nuts I am talking about. You have to judge for yourself, but I had a hard time with the original ones applying sufficient torque without stripping them.

[Pinder]

Yes, probably best to take up the carpet so you have the same nut size.

[Kevkeller]

A rethreader is like a tap but the threads try to reshape the threads rather than cutting the threads.

https://a.co/d/2NV8geu

I’d try that first.

[WRe]

Hi,
one of my nuts which is tacked to the tunnel was also bad. As a quick solution I used a longer screw with an additional nut ontop to solve the problem.
Later I removed the flimsy nut and used the original screw with a new nut, although, as in the first case, this required a helping hand to hold it.
...WRe

[Cees Klumper]

I think replacing by tack welding new nuts is the best solution.
I suppose this also tells us these bolts really don't need to be tightened all that much.

[stickandrudderman]

Buy yourself a time-cert kit and do what any professional would do.
https://www.timesert.com/

[Sens]

I removed 4 bad nuts and replaced them by new ones tag welded to the floor.
Problem solved!

Thanks a lot for your support!

Halvor