Helicoil in rear hub for rear damper bolt possible?

Don.Hasi · 3rd September 2023, 11:26

My rear damper thread in the hub is messed up, the thread in the hub is damaged. I can't get the damper bolt fastened.

Do you think it is possible to fix it with a helicoil? If so what is please the dimension of the bolt to get the right helicoil.

Thanks in advance
Don

Arctic · 3rd September 2023, 19:26

Quote:

Originally Posted by Don.Hasi

My rear damper thread in the hub is messed up, the thread in the hub is damaged. I can't get the damper bolt fastened.

Do you think it is possible to fix it with a helicoil? If so what is please the dimension of the bolt to get the right helicoil.

Thanks in advance
Don

Hi Don.
I would look to have it re-taped myself, helicoil may not be strong for the strut to be honest.

Someone else may have a different opinion ?

trikey · 3rd September 2023, 19:44

I'd use a nursery rather than a helicoil or drill it out and use a through bolt and nut to secure it short term.

Best way is to fit a decent used hub.

Sent from my SM-G780G using Tapatalk

daveo138 · 3rd September 2023, 20:07

Depending on how damaged the thread is, re-tapping might be the easiest option, as Arctic said.

Mike Noc · 4th September 2023, 08:23

Had something similar when a bolt picked up whilst being removed and damaged the thread. Taped it out no problem - luckily I had a tap of the correct size that I had bought in error a couple of months before.

If that hadn't worked I would have helicoiled it. Done correctly, (including using the correct length of helicoil) in most cases helicoiling is stronger than the original thread. Many new parts that we use in work come with helicoils already fitted for this very reason. Use one that is too short though, and as mentioned, it may not be up to the job.

.

trikey · 6th September 2023, 19:53

Quote:

Originally Posted by Mike Noc

Had something similar when a bolt picked up whilst being removed and damaged the thread. Taped it out no problem - luckily I had a tap of the correct size that I had bought in error a couple of months before.

If that hadn't worked I would have helicoiled it. Done correctly, (including using the correct length of helicoil) in most cases helicoiling is stronger than the original thread. Many new parts that we use in work come with helicoils already fitted for this very reason. Use one that is too short though, and as mentioned, it may not be up to the job.

.

Exactly Mike, we fit helicoils to freshly cast aluminium aerospace parts.

Sent from my SM-G780G using Tapatalk

Typhoon190 · 8th September 2023, 07:19

The other concern is ensuring that the drilled hole for the helicoil is perfectly in line with the original, so that it is perpendicular to the face of the trailing arm otherwise the bolt won't be loaded evenly when torqued up. Generally speaking the drill should follow the existing hole, but I struggled to keep it in line enough when laid underneath the car on the driveway when the thread stripped.

SCP440 · 8th September 2023, 20:38

Depending on how much damage there is there are tools that can recover a thread. I have a box of them in most sizes of imperial and metric and I have lost count of the times they have saved me having to helicoil or do some other repair. Like this https://www.amazon.co.uk/dp/B0B9WYN9...sdp5zjlmb22idx
The other option is to run a dril to clear the threads completly and just use a nyloc nut and bolt. A lot of cars use this method from the factory.

3rd September 2023, 11:26	#1
Don.Hasi Regular poster 75 Saloon CDTi Auto Join Date: Jan 2016 Location: Karlsruhe Posts: 75 Thanks: 49 Thanked 2 Times in 2 Posts	Helicoil in rear hub for rear damper bolt possible? My rear damper thread in the hub is messed up, the thread in the hub is damaged. I can't get the damper bolt fastened. Do you think it is possible to fix it with a helicoil? If so what is please the dimension of the bolt to get the right helicoil. Thanks in advance Don __________________ Mods: Vitons, Samco intercooler tubes, inline Thermostat R5, T4 remap, Eibach lowering springs, Monroes Front, ARB-poly bushes Harman Kardon speakers upgrade, PIAA aerovison blades, some PPD accessories

3rd September 2023, 19:44	#3
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,772 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	I'd use a nursery rather than a helicoil or drill it out and use a through bolt and nut to secure it short term. Best way is to fit a decent used hub. Sent from my SM-G780G using Tapatalk __________________ Lest we forget..

4th September 2023, 08:23	#5
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Had something similar when a bolt picked up whilst being removed and damaged the thread. Taped it out no problem - luckily I had a tap of the correct size that I had bought in error a couple of months before. If that hadn't worked I would have helicoiled it. Done correctly, (including using the correct length of helicoil) in most cases helicoiling is stronger than the original thread. Many new parts that we use in work come with helicoils already fitted for this very reason. Use one that is too short though, and as mentioned, it may not be up to the job. . Last edited by Mike Noc; 4th September 2023 at 11:46..

8th September 2023, 07:19	#7
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,707 Thanks: 328 Thanked 557 Times in 443 Posts	The other concern is ensuring that the drilled hole for the helicoil is perfectly in line with the original, so that it is perpendicular to the face of the trailing arm otherwise the bolt won't be loaded evenly when torqued up. Generally speaking the drill should follow the existing hole, but I struggled to keep it in line enough when laid underneath the car on the driveway when the thread stripped. Last edited by Typhoon190; 8th September 2023 at 07:21..

3rd September 2023, 20:07	#4
daveo138 Gets stuck in Rover 75 Tourer Join Date: Mar 2022 Location: Chesterfield Posts: 675 Thanks: 206 Thanked 69 Times in 53 Posts	Depending on how damaged the thread is, re-tapping might be the easiest option, as Arctic said.

8th September 2023, 20:38	#8
SCP440 I really should get out more....... MG ZT-T 260 Join Date: Feb 2016 Location: Witney Posts: 2,504 Thanks: 6 Thanked 910 Times in 571 Posts	Depending on how much damage there is there are tools that can recover a thread. I have a box of them in most sizes of imperial and metric and I have lost count of the times they have saved me having to helicoil or do some other repair. Like this https://www.amazon.co.uk/dp/B0B9WYN9...sdp5zjlmb22idx The other option is to run a dril to clear the threads completly and just use a nyloc nut and bolt. A lot of cars use this method from the factory.