Mac1508 Posted March 23 Share Posted March 23 Hi Guys, not finding much on this one, changed my chain for first time, bought bike a week ago, it was pretty rough. But came to the front sprocket removal and I dont have anyhting to remove this lock nut thing. is there a specific tool or technique? I removed those two small 10mm bolts but then that centre locking nut seems to require some toothed socket Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted March 23 Share Posted March 23 That looks like the splines of the drive shaft on my phone. It looks pretty neglected so the drive cogbis probably seized on the shaft. Put plenty of lube on it and maybe a bit of heat as well. Don't go bashing it with a hammer. Quote Link to comment Share on other sites More sharing options...
Ian Frog Posted March 23 Share Posted March 23 As @Mississippi Bullfrog said put the hammer away for a bit. Lube then heat is correct. You have removed the 2 small bolts that secure the plate that slides over the splined output shaft and that assembly is what retains the sprocket. In theory you just lift that washer from the shaft and wriggle the sprocket off. All that is holding you back at the moment is corrosion so lube heat and repeat. Cheers Ian Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted March 23 Share Posted March 23 From my days of restoring 1970's cars which were generally rust buckets...... If you're working on a bike that looks pretty rusty you're going to come across this problem of freeing off corroded parts. Get yourself some PlusGas penetrating fluid. 90% of seized bolts come loose with that alone and it works quite quickly. For the remaining 10% give it another dose of PlusGas followed immediately by a squirt of WD40. WD40 alone isn't much use other than on lightly seized parts but as it is a dispersant it drives the PlusGas into corroded parts better. I worked on some cars which were heavily corroded and only one bolt (an upper suspension bolt in a 1971 Viva) refused to succumb to PlusGas + WD40. Sometimes soaking it overnight works wonders. Heat also works buy just be cautions if you're recently applied WD40 because it's inflammable. As said above, don't go hammering it but you can tap gently, just enough to break the rust seal. Many light taps are better than one or two big whacks. Sometimes a puller can help for this kind of thing. Quote Link to comment Share on other sites More sharing options...
Nick the wanderer Posted March 23 Share Posted March 23 Try rotating the plate that you have taken the bolts out of on the shaft. Think bayonet light bulb. Quote Link to comment Share on other sites More sharing options...
Simon Davey Posted March 23 Share Posted March 23 Once it's had a good soak with penetrating fluid, What about using a bearing/clutch puller? Quote Link to comment Share on other sites More sharing options...
RideWithStyles Posted March 23 Share Posted March 23 as the others say, remove chain, remove small bolts and plate, pent liq, big long shaft flat headed screw driver behind sprocket and in front of case pull the driver at a 11 to 2 contact points a bit then spin the sprocket a bit so your now lifting what would have been 11 to 8 ooints and just keep moving it round bit at a time. Quote Link to comment Share on other sites More sharing options...
Phil1 Posted March 24 Share Posted March 24 (edited) Another option if you're really struggling is to cut the face of the sprocket down one side with a grinder, just away from the output shaft, it'll significantly weaken it and allow it to be split and just pull straight off. Like the image, and if you're really really struggling then do both sides Edited March 24 by Phil1 Quote Link to comment Share on other sites More sharing options...
Mac1508 Posted March 24 Author Share Posted March 24 ah cheers guys, yeah I swapped chain and rear sprocket, but left this alone till I was certain what I was dealing with. glad I asked yeah the two wee bolts came out with some tender care, but just wasnt sure on middle bit. perfect no need for special tools will give her a good soaking once weather clears up 1 Quote Link to comment Share on other sites More sharing options...
Mac1508 Posted March 24 Author Share Posted March 24 yeap right enough, there was a Shim infront, with matching teeth, shifted teh shim off the spline the a wee love tap and some oil on sprocket and she came easy enough cheers guys 5 2 Quote Link to comment Share on other sites More sharing options...
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