Can't removal rotor

[Yurkie]

Not sure if I've missed something or I just need to continue to persist with what I'm doing?

I've screwed in the rotor pull tool as tight as I can, hit it the end of it with a hammer and repeated this for the last couple of hours but the rotor still doesn't want to come off.

This is on a cb750f2 1977 supersport if that makes any difference?

[MarkCR750]

They can be ridiculously tight, make sure you tighten the removal tool well and apply heat to the flywheel  then whack with the hammer.

[Bryanj]

Are you using the 4 legged extractor or the single bolt?

[Yurkie]

Thanks for the replies. I'm just about to go out and buy a gas torch. Surprisingly I haven't needed one up to this point of the teardown.

I'm using a single bolt.


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[MCTID]

Having had a real struggle to remove difficult parts over the tears assisted by a small Butane Gas Cylinder.....I bit the bullet recently and bought a proper Sievert Propane Gas Torch.

It's like having an extra pair of hands. Obviously you have to be careful just how much heat you apply, but it makes even the most stubborn part that's been in place for over 40 years a doddle to shift.

It's worth every penny it and the gas bottle cost.

[pewe]

I used a cheap electric wheel impact wrench. In the £40 segment.
I had the crank on a thick plank of wood, a friend was standing on the crank. I let the impact wrench work with the alternator removal bolt for at least 20 sec until the alternator flew off. The bolt was fastened with Loctite when crank was refurbished and alternator lightened back in the early 80's.

I used loctite and wheel impact wrench when assemble it

[Yurkie]

Heat didn't work unfortunately so  my next stop is to purchase an electric impact wrench.


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[steff750]

Are you using the 4 legged extractor or the single bolt?

i have always used a three leg extractor  you do need too give the extractor a bang with a good heavy hammer aswell  and the alternator has always just sprung off for me?

[archmill]

I couldn't get the rotor off and just about ruined a three leg puller. Took the crank with the rotor attached to my local bike shop and he got it off with a bit of grunt and bad language using a spider ( looks like a car wheel brace ). No charge.

[Yurkie]

I might have to follow in you footsteps of going to a local bike shop. Tried heat with both a three leg puller and also the single bolt. Neither are looking to good now. Just need to find a single bolt puller with a nut head rather than the T bar which I have now bent. Then purchase an impact wrench. If that fails I need to look for a friendly bike shop.


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[Seabeowner]

On the 500/550 the thread is M16 x 1.5 I think. I used a fiat van wheel bolt bought on ebay for £1.50 and turned a couple of threads off so that it pushed evenly on the end of the crankshaft. Used 4 times with no problem. Heat with hand held electric gun, tighten really hard, whack with aluminium headed mallet, tighten again, and whack again.

[mike the bike]

Isn't that the same thread as the oil filter bolt?

[Drew400]

One further thought from a rank amateur.... tighten the puller then leave for a few hours, go and do something else then tighten it further again. Repeat. This doesn't work if the job needs doing quickly, but eventually the forces applied will have a bearing on the outcome given enough time!

[Yurkie]

Ok I've finally got the puller off. Took the puller tool which had a tommy bar in it a cut a hex on it for a socket, and used a wrench with an extended bar to increase the leverage. Thanks for all the help and suggestions.


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