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Another Loose Sprocket Nut - Printable Version

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Another Loose Sprocket Nut - ChrisG - 10-06-2007

Just checked my front sprocket nut, and it's loose, despite the folded but of the washer still being tight against it [img]style_emoticons/<#EMO_DIR#>/ranting.gif[/img]

Worse it'll the nut will turn but won't unscrew [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img]

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?

Another Loose Sprocket Nut - TonyDevil - 10-06-2007

<!--quoteo-->QUOTE<!--quotec-->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 [Image: wink.gif]

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

gimme a shout if you want some help<!--QuoteEnd--><!--QuoteEEnd-->

Another Loose Sprocket Nut - ChrisG - 10-06-2007

This is getting confusing, I seem to be having a conversation with 1 person across three threads on 2 forums [Image: blink.gif]

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 [Image: ranting.gif] 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.

Another Loose Sprocket Nut - TonyDevil - 10-06-2007

[Image: rotflmmfao.gif] [Image: jester2.gif] [Image: blush.gif] 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

Another Loose Sprocket Nut - jht - 10-06-2007

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.

Another Loose Sprocket Nut - robelst - 10-06-2007

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. [Image: blink.gif] 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 [Image: rolleyes.gif]

Another Loose Sprocket Nut - TonyDevil - 10-06-2007

i think the Yammie sprocket might be slightly thicker [Image: unsure.gif]
which i had one of those micrometer thingys, i'd have been able to measure it [Image: rolleyes.gif]

Another Loose Sprocket Nut - ChrisG - 11-06-2007

<!--quoteo(post=43451:date=Sun 10th Jun 2007, 08:19 PM:name=Toneski)-->QUOTE(Toneski @ Sun 10th Jun 2007, 08:19 PM) <{POST_SNAPBACK}><!--quotec-->[Image: rotflmmfao.gif] [Image: jester2.gif] [Image: blush.gif] 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<!--QuoteEnd--><!--QuoteEEnd-->

Well to be fair I started it [Image: rolleyes.gif] [Image: rotflmmfao.gif]

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.



<!--quoteo(post=43453:date=Sun 10th Jun 2007, 08:44 PM:name=jht)-->QUOTE(jht @ Sun 10th Jun 2007, 08:44 PM) <{POST_SNAPBACK}><!--quotec-->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.<!--QuoteEnd--><!--QuoteEEnd-->

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.

Another Loose Sprocket Nut - Galilee - 11-06-2007

<!--quoteo(post=43427:date=Sun 10th Jun 2007, 06:53 PM:name=ChrisG)-->QUOTE(ChrisG @ Sun 10th Jun 2007, 06:53 PM) <{POST_SNAPBACK}><!--quotec-->Just checked my front sprocket nut, and it's loose, despite the folded but of the washer still being tight against it [Image: ranting.gif]

Worse it'll the nut will turn but won't unscrew [Image: sad.gif]

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?<!--QuoteEnd--><!--QuoteEEnd-->

This forum seems full of loose nuts. [Image: rotflmmfao.gif]
Most of them are probably unscrewed too. [Image: rotflmmfao.gif]

Another Loose Sprocket Nut - TonyDevil - 11-06-2007

<!--quoteo(post=43484:date=Mon 11th Jun 2007, 06:34 AM:name=ChrisG)-->QUOTE(ChrisG @ Mon 11th Jun 2007, 06:34 AM) <{POST_SNAPBACK}><!--quotec-->Well to be fair I started it [Image: rolleyes.gif] [Image: rotflmmfao.gif]

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.<!--QuoteEnd--><!--QuoteEEnd-->
no probs, me nut should be welded on by then [Image: good.gif]
the locktite that halfords have is the cheap home use stuff, it wouldnt hold a fairing screw on [Image: dry.gif]
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! [Image: blink.gif]

<!--quoteo(post=43487:date=Mon 11th Jun 2007, 08:18 AM:name=Galilee)-->QUOTE(Galilee @ Mon 11th Jun 2007, 08:18 AM) <{POST_SNAPBACK}><!--quotec-->This forum seems full of loose nuts. [Image: rotflmmfao.gif]
Most of them are probably unscrewed too. [Image: rotflmmfao.gif]<!--QuoteEnd--><!--QuoteEEnd-->
[Image: rolleyes.gif] true

Another Loose Sprocket Nut - ChrisG - 11-06-2007

<!--quoteo(post=43505:date=Mon 11th Jun 2007, 11:31 AM:name=Toneski)-->QUOTE(Toneski @ Mon 11th Jun 2007, 11:31 AM) <{POST_SNAPBACK}><!--quotec-->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! [Image: blink.gif]<!--QuoteEnd--><!--QuoteEEnd-->

Sounds like you're gonna struggle to get it off to weld it [Image: rotflmmfao.gif]

Another Loose Sprocket Nut - TonyDevil - 11-06-2007

<!--quoteo(post=43574:date=Mon 11th Jun 2007, 07:34 PM:name=ChrisG)-->QUOTE(ChrisG @ Mon 11th Jun 2007, 07:34 PM) <{POST_SNAPBACK}><!--quotec-->Sounds like you're gonna struggle to get it off to weld it [Image: rotflmmfao.gif]<!--QuoteEnd--><!--QuoteEEnd-->
a couple of spot welds on the shaft/nut to add to the locktite
that bassad aint ever coming off

Another Loose Sprocket Nut - Guest - 12-06-2007

<!--quoteo(post=43427:date=Sun 10th Jun 2007, 05:53 PM:name=ChrisG)-->QUOTE(ChrisG @ Sun 10th Jun 2007, 05:53 PM) <{POST_SNAPBACK}><!--quotec-->Just checked my front sprocket nut, and it's loose, despite the folded but of the washer still being tight against it [img]style_emoticons/<#EMO_DIR#>/ranting.gif[/img]

Worse it'll the nut will turn but won't unscrew [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img]

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?<!--QuoteEnd--><!--QuoteEEnd-->


I must say this is sounding more and more like the same problem on the DRZ400, which suffers from a loosening front sprocket nut.
What happens on the DRZ, isn't the nut coming loose, as the tab washer prevents it from coming undone, but the very slight rocking back and forth on the splined shaft due to accelration and decelration, causes wear on one of the internal clamping faces behind the sprocket (inside the gearbox), which means a loss off clamping pressure, when it wears, and hence a 'loose' nut.

The solution is loctite 638 on the splines on the shaft, then put the sprocket on, and torque to 70Nm. This stops the sprocket rocking back and forth and hences stops the wear.
I have experienced this first hand and the loctite is a solution to the problem.

If the nut has come loose on your TDM, but the tab washer is still bent over, then the nut hasn't actually rotated and loosened. The only other thing that would cause a 'loose' nut would be wear between the clamping faces of the sprocket , oil seal spacer, bearing etc and hence loss of clamping force, which would allow the nut to be loose.

As tonski says, the normal loctite from halfords (blue 'stud locker' or red 'stud & bearing') is not strong enough. You need to get '638' from an industrial distributor
You will need a 3 legged puller to get the sprocket off when its time to change it

Another Loose Sprocket Nut - Guest - 12-06-2007

Thanks for the tip.

I've lost the front sprocket once and it caused no end of pain to both me and the bike. I'll go in hunt of 638 right away.

Another Loose Sprocket Nut - TonyDevil - 12-06-2007

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 [Image: good.gif]

Another Loose Sprocket Nut - Guest - 12-06-2007

<!--quoteo(post=43690:date=Tue 12th Jun 2007, 11:01 AM:name=Toneski)-->QUOTE(Toneski @ Tue 12th Jun 2007, 11:01 AM) <{POST_SNAPBACK}><!--quotec-->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 [Image: good.gif]<!--QuoteEnd--><!--QuoteEEnd-->


Yeah, a drop of the locitite on each spline around the shaft, then some on the insertion side of the sprocket in the splines, then fit sprocket, then torque up nut. Wheter you apply any on the thread of the nut is up to you, but with the tab washer bent over the nut isn't going to cime undone any way, as has been demonstrated, loose nuts are held in place by the tab washer

Believe me, it will not move with Loctitie 638.

Another Loose Sprocket Nut - wicklamulla - 12-06-2007

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

Another Loose Sprocket Nut - Guest - 12-06-2007

<!--quoteo(post=43708:date=Tue 12th Jun 2007, 12:48 PM:name=wicklamulla)-->QUOTE(wicklamulla @ Tue 12th Jun 2007, 12:48 PM) <{POST_SNAPBACK}><!--quotec-->can ya simply chip away the 638 when ya need to remove the worn out front sprocket ??<!--QuoteEnd--><!--QuoteEEnd-->


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

Another Loose Sprocket Nut - wicklamulla - 12-06-2007

<!--quoteo(post=43709:date=Tue 12th Jun 2007, 12:58 PM:name=GuyGraham)-->QUOTE(GuyGraham @ Tue 12th Jun 2007, 12:58 PM) <{POST_SNAPBACK}><!--quotec-->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<!--QuoteEnd--><!--QuoteEEnd-->

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

Another Loose Sprocket Nut - ChrisG - 12-06-2007

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