157 replies to this topic

[ChrisG]

Just checked my front sprocket nut, and it's loose, despite the folded but of the washer still being tight against it

Worse it'll the nut will turn but won't unscrew

Guess I'm gonna have to cut it off (cut the last one off with a dremmel and a chisel), neaten up the thread, and hope it's not so badly damaged that a new one will hold. Anyone tried threadlock on them?

[TonyDevil]

chris,
its most likely popped over a couple of thread
chances are the thread on the nut is knackered, not the thread on the shaft
carrying 2 spares doesnt seem so silly now

i've got some of permenent locktite for when you get the nut off

gimme a shout if you want some help

[ChrisG]

This is getting confusing, I seem to be having a conversation with 1 person across three threads on 2 forums

Cheers for the offer, hopefully I'll be ok, I've had practice. When the original one died it was so loose you could spin it by hand, this one needs a spanner so hopefully isn't as bad. I had to wedge the original one in place with a screwdriver then cut through most of it with one of those little cutting disks on a dremmel, then chissel the thing off, but once I'd run that die up the thread the new nut seemed to hold ok.

Is yours currently held on with permenant loctite then?

I'm gonna need to nip in to Halfords as I seem to have cunningly not put my 3/8" to 1/2" adaptor with either my 3/8" drive torque wrench and socket set or the 1/2" drive socket that I need to do the job so I'll pick up some locktite at the same time. I'll give Bykebitz a bell in the morning and order a couple of nuts.

Edited by ChrisG, 10 June 2007 - 05:47 pm.

[TonyDevil]

sorry for the confusion

yes to locktite, mine should be gettin welded this week
the locktite i have is the industrial stuff for 'permenant' use
i'll bring it with me on friday if thats any help

[jht]

thats a bugger!!

Don't bother with halfords

go to AHC on A30 in camberley for locktite (there is a branch in Farnham too I think http://www.ahc-camberley.co.uk/ )
be interested to see if they stock/ can get the nut, and what cost.

[robelst]

Despite the impressive size of the nut it should "only" be torqued up to a rather modest 70 Nm. When I loosened the one my bike I almost had to extend the wrench to make it come off. Given the average cave-man subtlety many dealer-mechanics work with I wouldn't be suprised if the cause is to be ound in that area. I used blue (non-permanent) Loctite when fitting it. The new sprocket I fitted was a JT one but seemed to fit very well on the shaft.
Nevertheless, after all these scary stories here I may have a look again before the chain needs replacing

[TonyDevil]

i think the Yammie sprocket might be slightly thicker
which i had one of those micrometer thingys, i'd have been able to measure it

[ChrisG]

sorry for the confusion

yes to locktite, mine should be gettin welded this week
the locktite i have is the industrial stuff for 'permenant' use
i'll bring it with me on friday if thats any help

Well to be fair I started it

If you don't mind be borrowing it for the weekend then yes please, although it's easy enough for me to pick some up as the rate you go thoguh sprocket nuts you're likely to want ti.

thats a bugger!!

Don't bother with halfords

go to AHC on A30 in camberley for locktite (there is a branch in Farnham too I think http://www.ahc-camberley.co.uk/ )
be interested to see if they stock/ can get the nut, and what cost.

Only planning on Halfords for the 3/8" to 1/2" adaptor and possibly the locktite, as I pass on on my way home form work. I'll order the nut through Bykebitz and pick it up on Saturday. The nut's still on there so it's safe enough to ride up to yours on Friday, and then spend saturday working on the sprocket hopefully in time for a bike club meet on Sunday.

[Galilee]

Just checked my front sprocket nut, and it's loose, despite the folded but of the washer still being tight against it

Worse it'll the nut will turn but won't unscrew

Guess I'm gonna have to cut it off (cut the last one off with a dremmel and a chisel), neaten up the thread, and hope it's not so badly damaged that a new one will hold. Anyone tried threadlock on them?

This forum seems full of loose nuts.
Most of them are probably unscrewed too.

[TonyDevil]

Well to be fair I started it

If you don't mind be borrowing it for the weekend then yes please, although it's easy enough for me to pick some up as the rate you go thoguh sprocket nuts you're likely to want ti.
Only planning on Halfords for the 3/8" to 1/2" adaptor and possibly the locktite, as I pass on on my way home form work. I'll order the nut through Bykebitz and pick it up on Saturday. The nut's still on there so it's safe enough to ride up to yours on Friday, and then spend saturday working on the sprocket hopefully in time for a bike club meet on Sunday.

no probs, me nut should be welded on by then
the locktite that halfords have is the cheap home use stuff, it wouldnt hold a fairing screw on
i was using a cable tie to apply it to the output shaft and the cable tie is now rock solid, could use it in me local for a game of darts!

This forum seems full of loose nuts.
Most of them are probably unscrewed too.

true

[ChrisG]

i was using a cable tie to apply it to the output shaft and the cable tie is now rock solid, could use it in me local for a game of darts!

Sounds like you're gonna struggle to get it off to weld it

[TonyDevil]

Sounds like you're gonna struggle to get it off to weld it

a couple of spot welds on the shaft/nut to add to the locktite
that bassad aint ever coming off

[TonyDevil]

thanks GG, nice to hear of a solution that others have come up with
are you saying to locktite the sprocket as well as the nut?

638 is the stuff i'm using

[wicklamulla]

can ya simply chip away the 638 when ya need to remove the worn out front sprocket ??

[wicklamulla]

No because its in between the splines on the shaft and the sprocket. Its like gluing the sprocket on in simple terms.

A puller is needed to get it off

i know the feeling all too well.......

[ChrisG]

If Tony or JHT are happy to lend me the 638 then I reckon that's the way to go, although I need to find myself a socket to fit my thread cutting die anyway (Halfords only sell up to 32mm) so might well nip in to AHC or somewhere similar for that, in which case I may as well get myself some 638 at the same time. I'll attack the splines with a toothbrush and some degreaser first though. Mate of mine's got a 3 legged bearing puller that should do the job to get it off again when I next need to.

Mate at work has just bought a dremmel he's happy to lend me so that should make cutting the old nut off a bit easier than the cheapie imitation onel I've got.

My main worry is torquing it up to 70NM, if the thread is already damaged there's presumably going to be a risk of it jumping a thread, will it still need to go that tight if I've got locktite everywhere? I've ordered 2 new nuts from Fowlers from just in case I do trash one by overtorquing it.

So emulsion tubes Friday, sprocket nut Saturday, and I bet it pisses down with rain on Sunday