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Anon Deleted Posts : Location : Status : Offline |
Rear shock lower bolt failure Any ideas on where I stand with this one: I got an MOT failure for the bolt being loose. I checked it and it's a nyloc nut 9/16 a/f with a massive headed bolt acting as the seat for the shock bush. Putting a spanner on the nut, it would turn the whole bolt, so I got my 26mm spanner on the bolt and a big wrench on the nut and began to turn. 1/2 turn later and the nut's sheared off - now I can see it's it's a shouldered bolt, and you can only do it up so tight before it bottoms out. So it was always done up to the maximum allowed, and is designed not to be a very tight fit on the bushTherefore the MOT centre were wrong to say it's loose - it's like that by design. Where do I stand with respect to the costs of the repair? ---------------------- |
 Thu 22 Aug 2013 @ 09:11
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Anon Deleted Posts : Location : Status : Offline |
hi, i might be wrong and am ready to be corrected, but i think theres a procedure of complant on the reverse of the mot? or you could contact your local VOSA test center? |
Thu 22 Aug 2013 @ 09:16
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Gethin Card Holder Posts : 462 Location : east lancs Status : Offline 
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are you talking about the shock absorber its self or the rear shackle ???? |
Thu 22 Aug 2013 @ 11:35
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Gethin Card Holder Posts : 462 Location : east lancs Status : Offline
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the torque for the shock is only 30 Lbf.ft where the shackle bolt is 105 Lbf.ft just re reading your post it sounds as if it is the rear shackle bolt now these arnt suppose to be loose and if it broke then it sounds like there was a weakness on the stem. the bolt has been change by some one along the line as the bolt is not shouldered but a hi tensile bolt.. Id check the rest of them on both sides and fit the correct bolts if you find any shouldered bolts. A loose rotating bolt in the wrong section can and dose wear away both bolt and hole at an alarming rate. If this had not been spotted by the MOT guy then you have no idea how soon that bolt would have sheared off whilst your driving around. How did the MOT guy notice the bolt loose ?? |
Thu 22 Aug 2013 @ 11:47
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Anon Deleted Posts : Location : Status : Offline |
Hi Gethin, Not sure what we mean by shackle, but it's the bolt that attaches the bottom fixing of the rear shock absorber. It is a tight fit in the bracket on the axle which provides the reaction to the force of the shock. The nut I sheared off is just a little one that holds a large washer in place that retains the bush in the shock. I'm sure it's the right bolt, just the guy was wrong to raise it as a failure. Thinking about it though, there is nothing fundamentally there to stop it rotating if it had some force applied to do that. I guess the MOT guy was just poking about with a crow bar and noticed the bush wasn't really in compression like it would be for a wish bone, and assumed it was due to the bolt being loose rather than like it by design... To fix it in the short term (as I spoke to Adrian and he said he's sold out, and the guy who used to make them for him has died...) I'm going to drill out the centre of the broken bolt and re-tap it with something like M8, then screw a new bolt in the end to hold the large washer on. Later I'll try to get some pics and add them to the blog. ---------------------- |
Thu 22 Aug 2013 @ 21:14
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Gethin Card Holder Posts : 462 Location : east lancs Status : Offline
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AH got you now . them bolts rarely give any trouble though . usual reasons for failure on them is the wrong shock fitted allowing the bottom bush to be loose on its seat or side to side movement because the bush is to narrow. If you can remove the bolt then you should be able to go to an engineering works or nut+bolt supplier. M8 is a bit thin to use though M10 or M12 would be best if your going down that route. |
Fri 23 Aug 2013 @ 14:20
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Gethin Card Holder Posts : 462 Location : east lancs Status : Offline
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111143866927 |
Fri 23 Aug 2013 @ 21:17
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