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Old 10-07-2017   #16
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by Petitpal View Post
Sounds like a plan - when I go to collect I'm going to see if I can get the service dept to find out what Fiat recommend for re-fitting; both torque specs (although I have some of that from searches on here and from the Haynes manual - even though it doesn't cover rear discs) and thread lock (and hopefully what grade as well, if they do!)

Assuming I can get anything out of them, I'll update here so we all know (should anyone else be as foolish as me again). Meanwhile... I'm going to see if I can find some suitable bolts so I can pop the stub axle back on so the car can rest on the floor while I wait for parts (instead of axle stands!)
Do the studs screw into a blind hole or is it a through hole?
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Old 10-07-2017   #17
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by jackwhoo View Post
Do the studs screw into a blind hole or is it a through hole?
Through hole on all four.
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Old 10-07-2017   #18
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by Petitpal View Post
Sounds like a plan - when I go to collect I'm going to see if I can get the service dept to find out what Fiat recommend for re-fitting; both torque specs (although I have some of that from searches on here and from the Haynes manual - even though it doesn't cover rear discs) and thread lock (and hopefully what grade as well, if they do!)

Here's a table from eLearn giving the thread specs & torque settings for the rear stud bolts.
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Old 10-07-2017   #19
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by Petitpal View Post
Through hole on all four.
In that case I would say 18Nm or so , use blue (medium strength) thread lock and assembled stub axle to axle and torque retaining nuts to spec before the thread lock cures (in order that no cured thread lock is under any loading)
If you are confident you won't need to remove the studs again you can use red (high strength) thread lock.
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Last edited by jackwhoo; 10-07-2017 at 21:57.
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Old 11-07-2017   #20
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

In terms of threadlock, what do you use? I can see a few different options around: Bond-It A43 Threadlock (on Amazon/eBay) that seems to be oil tolerant, and then Loctite (of varying grades - but something like 2400, which is a blue medium strength).

I'm tempted by the Bond-It, because of the oil tolerance, but it's a brand I've never heard of which makes me nervous about the quality. May well just be down to my lack of knowledge though.
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Old 11-07-2017   #21
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by Petitpal View Post
In terms of threadlock, what do you use? I can see a few different options around: Bond-It A43 Threadlock (on Amazon/eBay) that seems to be oil tolerant, and then Loctite (of varying grades - but something like 2400, which is a blue medium strength).

I'm tempted by the Bond-It, because of the oil tolerance, but it's a brand I've never heard of which makes me nervous about the quality. May well just be down to my lack of knowledge though.
It would use medium strength because that's what I already have .
I have never seen a thread lock that is not tolerant to oil when cured.
You don't need much so only but a very small tube.
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Old 13-07-2017   #22
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by jackwhoo View Post
In that case I would say 18Nm or so , use blue (medium strength) thread lock and assembled stub axle to axle and torque retaining nuts to spec before the thread lock cures (in order that no cured thread lock is under any loading)
If you are confident you won't need to remove the studs again you can use red (high strength) thread lock.
Just quick one on this (and before I go out, have a go, and bugger it up!) - are you saying:

- loctite and torque in the studs to 18Nm
- pop the stub axle back onto the car, fit the nuts and torque up to final spec (I'll check the setting exactly later)

OR are you saying:

- loctite and torque in the studs to 18Nm
- torque up the studs to final spec
- pop the stud axle back onto the car, fit the nuts and torque up to final spec

I'm assuming the first... just want to double check Cheers!
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Old 13-07-2017   #23
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by Petitpal View Post
Just quick one on this (and before I go out, have a go, and bugger it up!) - are you saying:

- loctite and torque in the studs to 18Nm
- pop the stub axle back onto the car, fit the nuts and torque up to final spec (I'll check the setting exactly later)

OR are you saying:

- loctite and torque in the studs to 18Nm
- torque up the studs to final spec
- pop the stud axle back onto the car, fit the nuts and torque up to final spec

I'm assuming the first... just want to double check Cheers!
Yes the first one ,
Apply thread lock to threads of stud that screw into stub axle.
Screw studs into stub axle.
Torque studs to 18Nm into stub axle.
Straight after assemble stub axle to car and tighten nuts to 65Nm.
You are doing fine.
Jack
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Last edited by jackwhoo; 13-07-2017 at 16:37.
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Old 13-07-2017   #24
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Super, cheers. That's what I thought, but I just wanted to make sure. I'm a happy amateur in general but, as you said before, some things are more safety critical than others - better to be safe than sorry! Picked up the new studs from the dealers today - all the way from Italy(!) - so ready to get the poor thing back one it's wheels again!
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Old 13-07-2017   #25
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So... studs went in fine, all good and dandy. ABS sensor bolt decided to have it's go and sheared off. This was with a tiny wrench and almost no force. Either someone's been on this before me with some hefty tools or its just made of cheese. Happy days...
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Old 15-07-2017   #26
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by Petitpal View Post
So... studs went in fine, all good and dandy. ABS sensor bolt decided to have it's go and sheared off. This was with a tiny wrench and almost no force. Either someone's been on this before me with some hefty tools or its just made of cheese. Happy days...
Gorgonzola is an oe supplier to Fiat.
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Old 16-07-2017   #27
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

So as the final instalment (for anyone interested enough... I'm not... I lost interest weeks ago ): the cobalt drills went through the ABS bolt easily enough (v. impressed actually) - but then the 'easy out' stud remover turned out to be neither easy, nor out. It actually decided to shear off inside the sheared off bolt. Seriously. Luckily the cobalt drills drilled that out as well - so eventually I just carefully sized up drill bits until the bolt was no more. Found a new one, fitted with blue loctite - miraculously the threads were fine - then put the car back together (remembering a thin coating of copper grease on the back of the pads, for a change).

So hopefully - that's that.

So I think I've learnt three things:

1) Either I've turned into the Hulk or (more likely) Fiats are made of cheese.
2) I'm available for any Fiat race team that needs me to strip down the back end of a 500 (had plenty of practice now).
3) I'm sticking to working on my Golf in future!

Cheers for everyone's help.
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Old 17-07-2017   #28
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by Petitpal View Post
So as the final instalment (for anyone interested enough... I'm not... I lost interest weeks ago ): the cobalt drills went through the ABS bolt easily enough (v. impressed actually) - but then the 'easy out' stud remover turned out to be neither easy, nor out. It actually decided to shear off inside the sheared off bolt. Seriously. Luckily the cobalt drills drilled that out as well - so eventually I just carefully sized up drill bits until the bolt was no more. Found a new one, fitted with blue loctite - miraculously the threads were fine - then put the car back together (remembering a thin coating of copper grease on the back of the pads, for a change).

So hopefully - that's that.

So I think I've learnt three things:

1) Either I've turned into the Hulk or (more likely) Fiats are made of cheese.
2) I'm available for any Fiat race team that needs me to strip down the back end of a 500 (had plenty of practice now).
3) I'm sticking to working on my Golf in future!

Cheers for everyone's help.
If you encounter any very small diameter bolts in the future may I recommend a 1/4 inch socket on a screwdriver type handle for tightening, reduces chance of breakage. Learned the hard way too.
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Old 17-07-2017   #29
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Quote Originally Posted by jackwhoo View Post
If you encounter any very small diameter bolts in the future may I recommend a 1/4 inch socket on a screwdriver type handle for tightening, reduces chance of breakage. Learned the hard way too.
If you're new to car mechanics and have, erm, large hands, you could always get a precision 1/4" drive torque wrench until you develop a feel for working with these kind of bolts. Something like this.

Most folks new to the game tend to overtighten stuff, rather than the other way around.
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Old 17-07-2017   #30
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Re: 2008 500 1.4 sport, rear stub axle stud sheared

Then thing that gets me - I've been working on cars for years now... started with a '66 Beetle when I left Uni (and did everything from changing swing arms to stripping the heads down), went through one [cursed] Ford and then a number of VWs - never had a problem before. Used to strip a lot of threads in my younger days (having overly heavy hands and in the youthful belief that tightening more made it safer) - these days I have torque wrenches (having learnt the hard way as well) and I'm very cautious; always check out torque figures and so on.

This brake change felt like I was being filmed for the next series of 'look at this idiot'.
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