tap size

[rbm]

hi all looking to find out what size tap is needed for lower control arm bolts managed cross thread one of mine cheers

[SD1too]

Front or rear suspension Robert?

For a bolt it's a die you'll need.

Simon

[COLVERT]

Probably easier to find a new bolt rather than try and repair a damaged one.---A bolt would be cheaper than a die and holder.---

[COLVERT]

Another idea if you are desperate.----Find a nut to fit a good bolt.---Carefully cut it in half across the hole.--Clamp it on the bolt to be re-furbished above the damaged thread. ( In a vice. )-- Then carefully unscrew the bolt re-forming the damaged thread as you do.--The cut nut effectively giving you 4 cutting edges to clean the bolt thread with.

[rbm]

its the front sub. frame already bought new bolts its the threads in the sub frame i want to re tap cheers

[Ducati750cc]

Originally Posted by rbm

its the front sub. frame already bought new bolts its the threads in the sub frame i want to re tap cheers

Is it the 2 ( each side ) rear trailing arm bush mount bolts ( 18mm head ) that screw into the subframe from above ?


If so, have you dropped the subframe to enable access to be able to run a tap through the threads ?


If you can confirm that it is these bolts, I'll have a couple knocking about somewhere and will measure the bolt dia. and thread pitch for you.


But seeing as you have the correct bolts, the quickest way would be to visit a local nut and bolt / engineers suppliers with the sample bolt, describe the problem, ask their advice, then they will be able to supply you with the correct 1st, 2nd and 3rd tap ( or taper, plug, bottoming ) to solve the problem

[SD1too]

Originally Posted by rbm

it's the front sub. frame already bought new bolts ...

I believe that you're talking about FT 114407 then Robert and Rimmer's listing gives those as M14 x 40.

By the way, I've just done this job. To eliminate the risk of cross-threading, remove the anti-roll bar saddle clamp screws (poor access and zero visibility, 10mm 3/8 in. drive socket needed plus universal joint) and this will enable you to move the anti-roll bar aside and place a socket on your M14 bolts (with lightly greased threads).

Simon

[rbm]

hi yes its the bolts that bolt arm to sub frame just bought a tap fingers x its the right one m14x 1,25 no need to drop the sub frame you can access it by removing anti roll bar bolts
and bush. to get better access cheers

[COLVERT]

Originally Posted by rbm

hi yes it's the bolts that bolt arm to sub frame just bought a tap fingers x it's the right one. m14x 1,25 No need to drop the sub frame you can access it by removing anti roll bar bolts
and bush to get better access, cheers

Be very careful on its location as you start to use it.---It is very easy to start a new thread at, maybe, half the pitch of the old one.---

PS.--- A taper tap will not be needed.

[trikey]

The correct size tap is M14x2 be very careful when starting it off, if you cut the thread incorrectly it will be a new subframe!