Will be changing the front ABS sensor on a 13yr old Xantia, already I've sheared the bolt where the heat shield attaches (but thankfully not the nuts on the stud).
I will be using some heat and a release agent type spray - but the choice I have is either WD40, Duck Oil or some TF2 lubricant spray (with teflon !!). I expect the TF2 will be useless, but out of the other two which would be best for freeing a very solidly rusted and seized stud ?
Go and buy some Plus Gas. It's the daddy. Failing that, try the WD.
Personally I haven't got on well with any so-called release agent. Heat is the thing, but even then may not work. Make sure you try to *work the bolt back and forth gently*, rather than try to make it turn in the same direction all the time. It may well free up by doing this little by little.
If it shears off completely, drill a hole in it using a drill that is somewhat smaller than the 'bolt' and make sure you drill off-centre. The idea is that you take out most of the bolt metal including some of the circumference. Once the bolt consists of a circle with a bit missing it will be able to collapse slightly into the hole if you tap it with a punch. Don't worry about the fact that you are also taking out some of the threads in the hole when you drill. Just don't drill off-centre too much - just enough (or a thou or so less than) to remove the side of the bolt.
Rob Graham
Well plusgas ois the nearest thing to usefull, but it's only near. Welding a nut on the end of the stud tends to make it glow red hot & come free though.
On Wed, 29 Jul 2009 18:24:25 +0100, jj mumbled:
I can't help you with the stud problem, but for changing seized ABS sensors on a Xantia I can offer the following advice..
Buy ABS sensor from Citroen.
Go to friendly local Citroen specialist.
Part with £40 and let them have the hassle.
Job done
:-p
Mike P
Go to my website
Thanks everyone. Already got the new sensor, not from a Citroen dealer - a LOT cheaper from elsewhere. Probably end up getting a local Cit specialist to do it but only after I've sheared the bolt off, saves them a few minutes work haha. £40 quids £40 quid after all.!
Managed to change the sensor, surprisingly easily - hardest part was disconnecting and reconnecting the plug !
The stud came out fairly easy, quick spray with WD40 and some gentle wiggling, no heat needed. Only one problem, the stud sheared when putting it back in ! There was no real resistance - just a bit stiff, then without warning it just sheared, I wasn't even applying that much pressure. Less than when removing it.
New issue, the sensors solidly in place and wont come out unless prised with a screwdriver, doesn't twist or anything. It's just not held by a bolt, nor is the heatshield - but again this is secure. So MOT fail or not ? Will (eventually) get round to sorting it, but as it doesn't seem to be a problem I might not bother.
You decide:
So basically as long as the light comes on, then goes off its a pass. Regardless of the condition or security of the actual components ! Although the tester should point out the missing stud.
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