Use once nuts

[rtbcomp]

https://en.wikipedia.org/wiki/Split_beam_nut

 

[Turbo]

During an mot the tester gave me a telling off for not using a new nut on the ball joint clamp after working on the suspension. Apparently they can fail you for that but he let me off. You are not supposed to reuse nyloc nuts on critical car components. I always loctite them but that's not sufficient.

Unfortunately Peugeot use uncommon threads meaning nuts are hard to find & expensive!

 

[mcostello]

How can they tell they have been reused?

 

[Wendelspanswick]

How can they tell they have been reused?

New shiny joint with rusty nuts?

 

[AndyStobbs]

Its all discretional. How many front pulley bolts advise replacement, its usually some massive, super fine thead like M20 x 1.5 and 3" long to go with it. Looks like it wouldn't be out of place screwed into a puller, and all its got to do is keep a front pulley on, and yet its advised for replacement.

Yet the manufacturer never advises replacement of that little M8 bolt that holds down the battery clamp, which gets constantly soaked with rain water, gets eroded by acid fumes as the battery charges, and is screwed dry into a brass insert in a piece of plastic.

Use your judgement, as to what needs replacing.

 

[rtbcomp]

I think they advise which fasteners to replace when it isn't obvious. A pulley bolt that looks OK doesn't appear to need changing, whereas a corroded bolt does; a mechanic shouldn't need telling to replace it.

 

[mike os]

Some things just are not worth worrying about. .. nuts on stuff like this being one of them, critical or medium risk stuff with recommend replacements just do it unless they are extracting with the price

Balance cost against potential damage. ..4 nuts vs new shaft, studs diff, and anything else it breaks if they fail

 

[DAPPH]

Hi, You could always deform the threads again with a centre punch or cold chisel across the face of the nut. It's not the first time I've seen it done 'in the field' on all kinds of nuts.

Colin

Would you want to be passenger in an aircraft flying to the USA that had the all the nuts on the engine treated in such a harsh manner ?

Wipe all such data from your neck top computer . defragment it and over write it with good engneering practices please..

 

[rtbcomp]

^^ It's called staking and is one of many accepted methods of locking nuts, different situations require different methods.

 

[DAPPH]

have u ever seen a propshaft come adrift and let go my stockcar had a 1/8 th steel plate under the seat for that verry reason.it was well dented .glad it wasnt my credentials when it did

whilst in HMF an 18 stone of main prop on a Thornycroft Mighty Antar tank transporter tore out at 30 mph whilst it was on the on the motor way with a Chieftain bridge layer tank on the trailer ( 106 tons total train weight ) . Thankfully no one was injured .

Once the tank and trailer had been disconnected & put on to the spare Antar in the convoy , it took me three days at teh side of the motorway to repair the truck enough to get it back to Bulford .

Highways road repair teams spent most of the night repairing the damaged road surface .

Evidently someone had fitted it new a few weeks earlier and used both old nuts & bolts when refitting . The UJ's whilst badly mangled were intact the , front
fange didn't have much damage to the bolt holes , indicating shearing rather than coming loose . The rear flange bolt holes were like flying saucers and torn out suggesting that they had come loose and then torn free.

 

[RaceDiagnostics]

Here are the new nuts from jag, they look bog standard, they actually look a bit second hand themselves.

 

[Pete.]

Those grip marks around the top look like they've been crimped to shrink the thread a bit to make it grip.

 

[Rocketman]

There are bolts and nuts on my Peugeot you are supposed to replace which aren't necessarily nyloc or stretch just basic high tensile nuts and bolts. I assume it's considered where they are and that they probably could have come to the end of there useful life by the time they are first replaced. Dunno.

 

[DAPPH]

Here are the new nuts from jag, they look bog standard, they actually look a bit second hand themselves.

Turn up a close tollerance round bar to just fit in the un crimped end then see it if fits through to the crimped end . If it does see if a precision bolt screwed in from the base end with your fingers does the same as the nut thread angle or pitch may be slightly altered .

 

[RaceDiagnostics]

Turn up a close tollerance round bar to just fit in the un crimped end then see it if fits through to the crimped end . If it does see if a precision bolt screwed in from the base end with your fingers does the same as the nut thread angle or pitch may be slightly altered .

Your are correct, they are crimped, just tried them on the stud.