They do hang on past their…
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On my old 750 Commando the…
On my old 750 Commando the engine sprocket was removed using a very simple device as shown in the attachment. Basically, a chunky piece of steel bar with two 1/2"AF bolts passing through this. A good dose of heat and a copper headed thumper always worked.
Attachments commando-engine-sprocket-extractor-jpg- Log in to post comments
Hello guys, I have tried a…
Hello guys,
I have tried all these methods as I say, the puller has now been applying tension for 3 days, I have thought about taooing a larger thread in the sprocket the only drawback to this is that with a normal length of tap it's not possible to get a holder on it, I shall persevere for the moment, a new cluth, clutch inner sprocket etc will cost more than the perishing machine cost me in the first place. Kind regards
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I did edit the previous po…
I did edit the previous posting to amend some of the typo's but I don' know where the edited version has gone!
however I also asked what a hydraulic puller was as I have not come across one, I do have however a slide hammer so maybe?
kind regards
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A hydraulic puller uses hy…
A hydraulic puller uses hydraulic power to pull instead of a thread, it allows application of much higher forces than a threaded puller with less effort, never needed one except to take a pulley of a lathe motor but what was impossible with threaded puller took seconds.
Expensive to buy but you can hire them from HSS etc.
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Like the idea of a hydraul…
Like the idea of a hydraulic puller John but I'm concerned the feet will be to thick to get behind the sprocket, I had to reduce my 3 legged one to enable me to do so, just had a go at tapping a thread I'm pretty sure it is hardened and my taps won't touch the metal. I have the puller on it again now tight as I can get it and loads of heat won't budge! guess I will just leave it under tension for a while then if no joy cut the damn thing off, I won't replace it if there is no thread for the puller in it anyway. what a damn cheap and stupid arangement! kind regards
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The hydraulic puller shoul…
The hydraulic puller should do it. When I had a similar problem, I borrowed one from the local bike shop. I wound it on and nothing happened. I then tightened it further with an extension on the tommy bar - I hate to think what tonnage of pull was on there. Still nothing. I had a good lookto see what was happening. Nothing. As I was standing up from peering at the puller there was an almighty bang and the puller, complete with sprocket, shot off, through a brand new 5 litre can of oil and imbedded itself in the brick wall of the garage. You can probably see a few flaws in how I went about this. Apply puller, jar (or belt) the sprocket and keep your head and all other parts out of the way.I was lucky.
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sorry Gordon, lost me a bi…
sorry Gordon, lost me a bit was your puller hydraulic or manual? 'you wound it on a bit with an extension on the tommy bar' ? 'twould suggest a manual type, gonna see what my local garage has in the way of pullers, he owes me a favour or two as he doesn't have a lathe!
kind regards
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As mentioned, it was indee…
As mentioned, it was indeed hydraulic. And dangerous in the wrong hands - mine at the time...
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Previously Gordon Johnston…
Previously Gordon Johnston wrote:
As mentioned, it was indeed hydraulic. And dangerous in the wrong hands - mine at the time...
crikey Qwelch! I take then you put a tommy bar extension on the hydraulic pump handle wow no wonder it came off like a missile,
anyways up Yippee, yippee, yippee, used two of the three legged puller arms? on the double yoke, left it over night, put as much on it this morning that it would take went and got a lump hammer and a small cold chisel, nothing ventured etc; gave the damn thing a couple of substantial doughboys and lo and behold just popped owf.
So thanks guys for all your suggestions and encouragement, I'm thinking of liking it a little more now.
kind regards
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The fault here surely lies…
The fault here surely lies with whoever stripped the puller threads in the first place...I don't quite understand how, to be honest - as you mentioned, the sprockets are hardened. The screws should just run in by hand until deep enough as they aren't doing any work until the centre bolt is tightned.
A good taper should require a good tap to break it but I've never had do do more than tighten the puller, thump with a copper hammer and perhaps repeat the operation once or twice.
I have a hydraulic puller for the main bearing inners but have never felt the need for anything bigger than the standard job on the engine sprocket.
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yes I agree it should real…
yes I agree it should really be impossible to strip a hardened thread, well I would have thought so anyway, however I didn't build this bike, I bought a rebuilt engine and a box of bits, my friend at the time had owned and if fact raced commando's for a number of years, he was without a British bike so I gave it to him to build and use, I had other brit bikes, I believe he used parts he already had in his garage as apart from soucing the primary cases and the front brake, sundary bits and pieces, it did not cost me a lot of money.
so who knows how this thread became stripped, what is irritating is the fact the sprocket is perfectly O.K. but I cannot get another thread in it, thought about turning something up to sit behind the sprocket and thus take the bolts but as there is a used sprocket on t'bay at an acceptable cost may leave this until I have more time [ should this ever happen!] and I am retired.
kind regards
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In my defence, I was but a…
In my defence, I was but a callow youth of 18 when I almost blew my head off with the hydraulic puller. Now substantially older and, just maybe, a tiny bit wiser. Or is that wishful thinking?
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Hi Gordon, I'm not to sur…
Hi Gordon, I'm not to sure that we get wiser as we get older but I am pretty sure youth is wasted on the young! kind regards
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They do hang on past their bedtime a lot, normally heat and a good belt does it, have you tired leaving the puller on overnight, sometimes its off by morning but may make a racket when it comes off if the garage is part of the house. You could also try a hydraulic puller which I have used before when nothing else worked, pricey so best borrowed. You could also tap the sprocket holes out to take the next size bolt.