nylex lock nuts washers or not

[mudder110]

howdy all, ive got a problem with the nylex lock nuts coming lose on my rear drive shaft, after about 5000ks where it ajoins the transfer case output.
does anyone use washers under the nuts? I do tow a camper a fair bit
would steel nuts &lock washers be a better option? cheers all.

[Phil B]

Are you using new nylock nuts every time?
They should be one use only IMO
They should also have washers under them I believe
Maybe you should try normal ht bolts and nuts + locktite
Regards
Phil

[mudder110]

thanks for the reply, yea I use new ones each time, these drive shafts were fitted in mt isa for me. I was to hot and to lazy to do it myself
previous ones were ht steel with lock nuts ANDwashers, but washers were not fitted with the nylex, so I just followed in suit thinking they weren't needed, be interested to know which is the better nylex or the ht steel
cheers again.

[oldyella 76]

Try deformed nuts they may be better.
Lindsay.

[JDNSW]

I use Nyloc and Loktite!

John

[DazzaTD5]

Just some info....

*Nylocs or rather "Nylon Inset Locknuts" should only be used once.
*shouldn't need any other locking such as using thread lock.

The more important part..
*Land Rover prop shaft retaining nuts and bolts are a 3/8 UNF thread, this includes new Defender TDCi (puma) models, the 3/8 UNF thread is also used on the diff carriers (non Salisbury diffs).

*The original 3/8 UNF nylon locking nuts Land Rover use are some non standard thickness.
*You can buy either thicker nuts or thinner nuts.
*In some applications such as Land Rover Discovery 2, the bolts on the transfer case end are too short too use the thicker nuts, so using the thinner nuts resolves this.
*The rear prop shaft on the transfer case on a Defender shouldnt (well not that I have seen) doesnt suffer the short bolt issue, so using the thicker nuts should be ok.

*You are not doing something silly such as using a Metric Fine nut are you?While I havent tried this and wouldnt have thought the thread pitch would be close enough for it to tighten up.

Pic below: Left 3/8 UNF thin nut, centre 3/8 UNF Land Rover nut, right 3/8 UNF standard thickness.

Its common for repairers *cough* dealers to re-use the nylocs, prolly because they dont know the nuts arent metric.

Regards
Daz
P.S Using a nylon locking nut that is too thick doesnt allow the thread to cut into the nylon part right at the end of the nut

[Graeme]

Its common for repairers *cough* dealers to re-use the nylocs, prolly because they dont know the nuts arent metric.What's metric or otherwise got to do with not re-using nyloc nuts?

[DazzaTD5]

What's metric or otherwise got to do with not re-using nyloc nuts?

They get re-used because the 3/8 UNF isnt something most workshop would have or even realise that its not a metric thread.

They also get re-used as how many workshops carry a range of nylon locking nuts?

Also how many would then make a run to the local fastener place to match up the odd nut?

The bigger workshops, a trades person might go to his/her supervisor and ask for new nylon locking nuts and likely get told, we dont have them, just use loctite.

Regards
Daz

[Phil B]

Few other things will cause such catastrophic damage if they come off. I would insist on new ones and then check they have been changed, or change them myself
Just my opinion though.

[mick88]

Nylocs don't normally come loose if the application is correct.
Use the correct (new) nuts and service removable Loctite (as back-up)!


Cheers, Mick.

[rick130]

An alternative to a nyloc is an aircraft K nut.

All metal locking nut with a reduced hex (so ideally you need a six point socket for tensioning) they will not come loose and can be infinitely reused.
They can be had in zinc plated or moly coated, it doesn't really matter which you use.
Be sure to use a genuine certified aircraft nut and not a cheap Chinese knockoff.

[dromader driver]

refer notes 7-64 -f and table 7-2. slide bar on right side of attachment should take you to the right bit



(http://www.faa.gov/documentLibrary/media/Advisory_Circular/Chapter_07.pdf)

http://www.faa.gov/documentLibrary/media/Advisory_Circular/Chapter_07.pdf

[Blknight.aus]

What's metric or otherwise got to do with not re-using nyloc nuts?

loctite 243 is, or was, the defence authorised loctite to use in place of new nyloc nuts when you had no choice but to reuse standard nyloc nuts. there was a list of about 5 caveats on doing so but the 3 i distinctly remember are

1. they were to be replaced at the next service
2. if there was already loctite in evidence if you had to reuse them then replacement nuts were to be ordered and placed onto the RPS common item list for your workshop
3. if loctite was already evident then the threads were to be meticulously clean on both the bolt/stud and inside the nut before being reused.

edit..

in addition to the info in the pdf above, prevailing torque is the torque required to wind the nut onto the thread.

IF you have to wind the nut on enough turns you can "wear out" the nyloc and it wont meet spec before it gets to the point where you are torquing it up.

[dromader driver]

forgot to mention the nyloc should have 2 threads protruding from the nylon section to be acceptable.

[mudder110]

Just some info....

*Nylocs or rather "Nylon Inset Locknuts" should only be used once.
*shouldn't need any other locking such as using thread lock.

The more important part..
*Land Rover prop shaft retaining nuts and bolts are a 3/8 UNF thread, this includes new Defender TDCi (puma) models, the 3/8 UNF thread is also used on the diff carriers (non Salisbury diffs).

*The original 3/8 UNF nylon locking nuts Land Rover use are some non standard thickness.
*You can buy either thicker nuts or thinner nuts.
*In some applications such as Land Rover Discovery 2, the bolts on the transfer case end are too short too use the thicker nuts, so using the thinner nuts resolves this.
*The rear prop shaft on the transfer case on a Defender shouldnt (well not that I have seen) doesnt suffer the short bolt issue, so using the thicker nuts should be ok.

*You are not doing something silly such as using a Metric Fine nut are you?While I havent tried this and wouldnt have thought the thread pitch would be close enough for it to tighten up.

Pic below: Left 3/8 UNF thin nut, centre 3/8 UNF Land Rover nut, right 3/8 UNF standard thickness.

Its common for repairers *cough* dealers to re-use the nylocs, prolly because they dont know the nuts arent metric.

Regards
Daz
P.S Using a nylon locking nut that is too thick doesnt allow the thread to cut into the nylon part right at the end of the nut





no dazza not the thin ones cheers