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+--- Thread: Rear Caliper Stripped Thread (/showthread.php?tid=70738)
Rear Caliper Stripped Thread - darrsi - 28-10-14
I'm not sure how it really happened because i always use copper grease and a torque wrench, and i'm not heavy handed anyway, but i've managed to strip the thread on the rear caliper where the back pad pin goes. :'(
There's a tiny bit of bite there so i've Loctite'd it for now, but was wondering if it can be safely helicoiled or not?
There doesn't appear to be much room to play with, and was also wondering if there's a chance i could damage a brake fluid chamber as well?
Has anyone tried this before, or are there any other options other than a replacement caliper?
Cheers, Darrsi. :\
Re: Rear Caliper Stripped Thread - greenman - 28-10-14
It might work out cheaper and perhaps safer to look on eBay..
Re: Rear Caliper Stripped Thread - JoeRock - 28-10-14
(28-10-14, 07:33 PM)darrsi link Wrote: I'm not sure how it really happened because i always use copper grease and a torque wrench, and i'm not heavy handed anyway, but i've managed to strip the thread on the rear caliper where the back pad pin goes. :'(Are you by any chance using copper grease and still using the torque settings recommended by the manufacturer? THat'd be why! Most torque settings are dry threaded (unless specifically saying otherwise), if you put copper grease on you need to drop the torque by about 25% in order to stop the threads from deforming as they slide easier with the grease on, thus giving you a false reading!
There's a tiny bit of bite there so i've Loctite'd it for now, but was wondering if it can be safely helicoiled or not?
There doesn't appear to be much room to play with, and was also wondering if there's a chance i could damage a brake fluid chamber as well?
Has anyone tried this before, or are there any other options other than a replacement caliper?
Cheers, Darrsi. :\
Re: Rear Caliper Stripped Thread - darrsi - 28-10-14
(28-10-14, 10:24 PM)JoeRock link Wrote: [quote author=darrsi link=topic=15140.msg171561#msg171561 date=1414521231]Are you by any chance using copper grease and still using the torque settings recommended by the manufacturer? THat'd be why! Most torque settings are dry threaded (unless specifically saying otherwise), if you put copper grease on you need to drop the torque by about 25% in order to stop the threads from deforming as they slide easier with the grease on, thus giving you a false reading!
I'm not sure how it really happened because i always use copper grease and a torque wrench, and i'm not heavy handed anyway, but i've managed to strip the thread on the rear caliper where the back pad pin goes. :'(
There's a tiny bit of bite there so i've Loctite'd it for now, but was wondering if it can be safely helicoiled or not?
There doesn't appear to be much room to play with, and was also wondering if there's a chance i could damage a brake fluid chamber as well?
Has anyone tried this before, or are there any other options other than a replacement caliper?
Cheers, Darrsi. :\
[/quote]
You live and learn.
As simple as that sounds, it does make perferct sense.
Saying that, i don't remember ever stripping a thread before that i can think of?
It was only 10Nm as well.
I'm weighing up my options and it would seem that the logical option is replace the caliper.
I have a machine shop and engineers at work but if anything unexpected happens it leaves me without a bike which is my only transport plus i'm on call for work every other week for work so i have to be ready to go.
Oh well, shit happens.
Cheers for the insight though, definitely one to remember in future.
Re: Rear Caliper Stripped Thread - darrsi - 28-10-14
Well this kind of reinforces that theory, and there was me thinking i was doing things correctly!
http://benmlee.com/4runner/threads/threads.htm
Re: Rear Caliper Stripped Thread - bootz76 - 29-10-14
Should be fine to helicoil.as you have access to engineers etc you could drill a hole in the pin and use an R clip like the front pins
Re: Rear Caliper Stripped Thread - bootz76 - 29-10-14
Or fill the hole with weld drill and tap a new thread
Re: Rear Caliper Stripped Thread - bootz76 - 29-10-14
Or or drill the head of both pins and lockwire them together
Re: Rear Caliper Stripped Thread - darrsi - 29-10-14
(29-10-14, 12:37 AM)bootz76 link Wrote: Should be fine to helicoil.as you have access to engineers etc you could drill a hole in the pin and use an R clip like the front pins
The issue with the helicoil was lack of space around the hole, and whether i'd tap into a fluid channel or chamber?
Was hoping someone may have attempted it before.
Re: Rear Caliper Stripped Thread - darrsi - 29-10-14
(29-10-14, 12:39 AM)bootz76 link Wrote: Or fill the hole with weld drill and tap a new thread
For something that is removed once or twice a year i was rather hoping for an easier solution, i'll look into this as a possibility.
Re: Rear Caliper Stripped Thread - His Dudeness - 29-10-14
Is it a hole for the small allen head bolts that hold the pads that is damaged?
Re: Rear Caliper Stripped Thread - darrsi - 29-10-14
(29-10-14, 12:54 AM)His Dudeness link Wrote: Is it a hole for the small allen head bolts that hold the pads that is damaged?
Yeah, the pad pin caliper thread, as you look at the caliper the one on the left at the back.
The pad pin thread is totally okay as it's steel.
Re: Rear Caliper Stripped Thread - Jules-C - 29-10-14
The caliper pins holes are a long way from any fluid channels drill out and helicoil shouldn't be a problem
Re: Rear Caliper Stripped Thread - unfazed - 05-11-14
(29-10-14, 12:37 AM)bootz76 link Wrote: Should be fine to helicoil.as you have access to engineers etc you could drill a hole in the pin and use an R clip like the front pins
+1 to the above :thumbup
Re: Rear Caliper Stripped Thread - darrsi - 05-11-14
(05-11-14, 06:55 PM)unfazed link Wrote: [quote author=bootz76 link=topic=15140.msg171612#msg171612 date=1414539421]
Should be fine to helicoil.as you have access to engineers etc you could drill a hole in the pin and use an R clip like the front pins
+1 to the above :thumbup
[/quote]
Where though??
Can't see where the 'R' clip would go?
Re: Rear Caliper Stripped Thread - unfazed - 06-11-14
Between the caliper body and back of pad. Would get you out of trouble.
Re: Rear Caliper Stripped Thread - darrsi - 06-11-14
I have a replacement on the way now so I will have a bit of time to see the best way to go with my old one.
Re: Rear Caliper Stripped Thread - unfazed - 06-11-14
And you will have the weekend to fit it