Hi all,

Hoping for some advice.

The threads on my hub knuckle that the calliper bolts go into are damaged. The calliper bolt continues to turn without tightening. Can this be retapped or a helicoil used? Or, will I be needing a new hub knuckle?

Thanks

 

if tis stripped it is time for another hub. fairly easy to locate used

 

I run PMNA caliper studs for this reason. No need for new hubs. If you already stripped yours, take the car to any competent race shop that deals that track preps 997GT3s. They are famous for this. Luckily this can be fixed with simple Timeserts and one hours worth of labor. A good shop can will do this for $100-150 and the hub will be stronger than new. Lots of guys Timesert their hubs before it ever becomes an issue.

If you need a replacement upright, I have both front and rear used ones..

 

+1Time serts are the way to go

 

Iv got used ones if it comes to that.

 

Cheap to find new uprights used usually. Get C4s/turbo. Do not get C4 spindles, they have the wrong bolt spacing for the calipers.

If you can wait a month or two you can buy mine. I am installing Cup spindles.

 

Thanks guys,

Sounds like helicoil or similar is the way to go. The challenge will be finding a place that can do it. If it comes to it I will be in touch with some of you about buying your hub knuckles.

Thanks

Matt

 

If you do your own work and own a drill you should be able to handle the thread restoration.

I repaired a rear knuckle on my 135i with a helicoil pretty easily. Drill out the old threads (specified diameter), tap using the helicoil tap, thread in the helicoil, then I used a punch to bung up the threads the helicoil threaded into to make sure it couldn't thread itself out. I was impressed. It had no problem taking the torque the suspension piece required.

 

A Timesert is not the same as a Helicoil. Go with a Timesert for this repair.

 

Correct. Timesert is a permanent repair, it's a steel insert threaded into place. Helicoil is a joke in comparison. I would not trust it in this application.

 

My concern with attempting this myself is inserting the helicoil or timesert straight as I'll have to insert it into the knuckle whilst it's still on the car. Would imagine it's quite easy to put it in crooked.

 

Pulling the front spindle is not terribly difficult. Or ypu could disconnect the tierod so you swing it where you can easily drill and tap.

 

Turn the steering wheel to full lock so you have open access to do the job. Then you need to have the caliper positioned in place and use the bolt opening in the caliper as a guide. Doing the fronts is very easy. The rear uprights are a more tricky and it helps to remove these and drill them out out of the car.

 

I have a good pair of 997S hubs that work for the update to 6 piston brakes if interested, send me a PM

 

Thanks guys,

My specialist has done it. They removed the front hubs to do it. Glad it's sorted and no need for new hubs!