dodgey screw holes

[Mike Calver]

Hello

One of the threads has just worn "again" in the back of my xxxs where diffs housing bolts on!!

I even under tightened the two screws so that they never destroyed the threads.

Does anybody out there know what i can do to stop this because if the other one goes then i've had it.

Do you think it's possible to buy gromets with a metal thread that you can slip in the holes

any help will be greatly appreciated

also does anybody else have this problem

Many thanks
Mike Calver

[DA_cookie_monstA]

One option it to upgrade to a 3mm cap head screw, as used on everything else except American cars, as these are slightly larger diameter, and a tighter thread.

[Mike Calver]

Thanks for the tip DCM

would that cure the problem or after time will the problem get worse, i really don't want to ruin my chassis as it hasn't been raced properly yet.
thanks Mike

[CrazyCano]

You can buy a 4-40 thread repair grip where you drill the hole larger then thread a metal spring into it as a new thread, better than new!

Try a few specialist tool suppliers for one

Alex

[DA_cookie_monstA]

If you are going to go for a thread insert kit, first I would check up as to what size holes you will need to used to thread the insert into, and then check to see if there is enough plastic there to hold it.

But, having used them in work, I would suggest the 3mm Cap Head screw first, and just don't over tighten it.

[richard_cree]

I've got a set of 4-40 helicoils (common thread repair kit). They are fantastic and have saved many a chassis for me.

[Dave G]

could try epoxy in the hole then retap it,thats what i do.

dave

[Mike Calver]

Thanks for your help guys,
think i'll try and find some 4-40 helicoils
Thanks Mike

[gingapaint]

the 3mm option is quite good, they're holding my xxx-s gear cover on.

[CrazyCano]

Apparently you can get helicoil sets from rs online.

[Doomanic]

RS do the Recoil range of thread repair.
They don't list 4/40 UNC.

[DA_cookie_monstA]

At a guess, you would have to go to a specialist engineering suppliers to get the kit, and it probably wont be cheap.

[Doomanic]

From J&L Industrial Supply the kit do 4/40 is about £45 plus VAT.

[tyreman]

Hello

One of the threads has just worn "again" in the back of my xxxs where diffs housing bolts on!!

I even under tightened the two screws so that they never destroyed the threads.

Does anybody out there know what i can do to stop this because if the other one goes then i've had it.

Do you think it's possible to buy gromets with a metal thread that you can slip in the holes

any help will be greatly appreciated

also does anybody else have this problem

Many thanks
Mike Calver

I just put a longer screw in and put a mini lock nut on my old chassis

[Mike Calver]

Thanks guys
the thread repair kit will be too pricey for me :'(
I'll try the 3mm screws then i'll give the long screw and nut a go
thanks for all your input
Mike

[Doomanic]

Try the long screws and a nut first, if you have no luck with that, then try the M3 screw.

[Mike Calver]

Cheers Doom

i'll try that way round tonight

[kriss]

I have had this problem with the tiny screws on the spur gear plastic cover. I think I will fill it with epoxy and then re-tap it. Cheers for the tip ;)
Chris

[Doughty]

Try the long screws and a nut first, if you have no luck with that, then try the M3 screw.


mini lock nut and long screws, thats how my chassis got through the worlds!

[tyreman]

Try the long screw and nut option first as you won't be increasing the overall size of the hole