How would you get it off?

How would you get it off?

Author
Discussion

Jammez

Original Poster:

656 posts

206 months

Thursday 23rd April 2015
quotequote all
Mate of mine is trying to change the chain & sprockets on his CB500. It's a pretty old bike but fairly new to him & I'm sure the front sprocket has never been changed in it's life!

He's got the nut off but cannot get the front sprocket to slide off the splines, he's tried various type of leverage giving it a wack on to try break the seal but it's not budging. He's tried heat but only has a normal blowtorch which I don't think can get enough heat into it.

The only 2 other options short of getting it into a garage who can do it for him is to buy a puller or to try & cut it off with a dremmel

Any suggestions before he goes mad?

sc0tt

18,032 posts

200 months

Thursday 23rd April 2015
quotequote all
Throw a shed load of wd40 on it for a few days. Should slide right off.

73mark

774 posts

126 months

Thursday 23rd April 2015
quotequote all
Drill a hole in it use a nut and bolt. Nut underneath sprocket bolt through sprocket into nut. A bit of metal underneath the lot to protect the bike and screw it until the sprocket comes off.

roboxm3

2,414 posts

194 months

Thursday 23rd April 2015
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Is there a circlip that needs removing (and possibly now replacing)?

Failing that, how about a bearing puller?

tvrolet

4,251 posts

281 months

Thursday 23rd April 2015
quotequote all
Buy a puller - they're not expensive. Too much heat could damage a seal (the live on the ice you know), and if you're levering it, you're levering it against something can can cause more damage, and unless you're levering it equally on both sides then it's just twisting on the shaft locking it up more.

If you got a decent but of metal bar (old tyre lever) then you can make up a puller real easy. I hole in the middle and put a nut, bolt and washer though so the bolt head can rest on the end of shaft. Not bolted to the bar, but all on one side with just the bolt through the hole and 'undoing the nut' pushes the bar out. Then 2 holes either end that line up with opposite gaps between teeth and 2 more bolts to connect the sprocket to the bar. Then 'undo' the nut in the middle. If the outside bolts 'splay' when pulled than put a strap round them or similar.

I'm assuming there isn't a couple of threaded holes already in the sprocket? Sometimes there is, so DIY puller above is the same except the outer bolts go straight in to the sprocket.

I've a drawer full of bits of metal bar and bolts that have taken off various flywheels, sprockets, balances etc... A couple of minutes to drill some holes in some scrap and it'll save hours of levering things, hitting things and skinned knuckles.

Prof Prolapse

16,160 posts

189 months

Thursday 23rd April 2015
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I'd listen to the TVR owner... 12 months ownership is basically a mechanical engineering degree.

Also pulley pullers can be resold on eBay often with no loss.


Mr2Mike

20,143 posts

254 months

Thursday 23rd April 2015
quotequote all
A puller is the way to go, and heat is the last thing to use unless he's going to be changing the oil seal anyway.

Hooli

32,278 posts

199 months

Thursday 23rd April 2015
quotequote all
tvrolet said:
Too much heat could damage a seal (the live on the ice you know)
laugh

Jammez

Original Poster:

656 posts

206 months

Friday 24th April 2015
quotequote all
Thanks for the advice guys, I've passed it on to him. He's passed the point of no return now & this things got to come off!

What started out as an attempt to save himself money by changing his own chain & sprockets is probably going to end in tears - he's already had to buy a chain breaker, blow torch, box of plasters & now a puller!

Would have been cheaper to drop in to the garage at this rate.

crofty1984

15,830 posts

203 months

Friday 24th April 2015
quotequote all
Jammez said:
Thanks for the advice guys, I've passed it on to him. He's passed the point of no return now & this things got to come off!

What started out as an attempt to save himself money by changing his own chain & sprockets is probably going to end in tears - he's already had to buy a chain breaker, blow torch, box of plasters & now a puller!

Would have been cheaper to drop in to the garage at this rate.
Poof. Any excuse to buy a new tool should be relished and taken full advantage of! (says the man with about 12 different saws in his garage)

ljrw93

40 posts

110 months

Friday 24th April 2015
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I've found a link to a PDF version of a manual for the bike, however, I'm not sure if I'm allowed to post it here. I can send the link to you in a message OP?

13aines

2,153 posts

148 months

Friday 24th April 2015
quotequote all
Jammez said:
Thanks for the advice guys, I've passed it on to him. He's passed the point of no return now & this things got to come off!

What started out as an attempt to save himself money by changing his own chain & sprockets is probably going to end in tears - he's already had to buy a chain breaker, blow torch, box of plasters & now a puller!

Would have been cheaper to drop in to the garage at this rate.
Remind him that he now has greater experience of this job (also applicable to others) and more tools, to enable him to do it again smile

DJP

1,198 posts

178 months

Friday 24th April 2015
quotequote all
Clean it very carefully and then check that the last owner hasn't welded it on...