SOHC.co.uk Forums > CB750

Layshaft bearing holder removal.

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SumpMagnet:
Impact driver is not having any effect....and I know from personal experience how things can go if you are not 'accurate' with that blow.

If I can't shift it with a bit more impactiness....I will break out the drill. My M6 bit is blunt as a blunt thing..so I will get a nice fresh one before I go that route. I have soaked some penetrating oil into it in the hope that some will find it's way where I need it ...but.... brute force it is then!

I will brace the motor a bit so it doesn;t slip....then apply effort! I'll let you know how I get on

K2-K6:
Yes you're right that you've got to support the motor so it doesn't go away from you.  It's more so that the bit stays engaged than anything else.

As Hairy pointed out about the countersink,  they are quite clever as the threads are not under much torque but the bite on the taper is what keeps it from undoing, and very effectively too.

It's not as brutal as it looks as a good impact driver doesn't transfer load straight into the structure,  but the internal cam should give the maximum load in a rotary direction to get it moving.  A club hammer just concentrates it in fewer blows.

I'm always wary of drilling these sort of fixings out as if you damage the taper in the bearing carrier, it could impair the effectiveness of the new screws.

Hope you get them out.

hairygit:
It is safe to use a 6mm drill bit as the thread is M6, therefore if you start slowly, and keep it fairly slow, you cannot damage the chamfer for the screw heads in the bearing holder. I have drilled them by choice successfully, as you will wonder why you bothered trying in impact driver as your hand throbs where you miss hit the driver and clout your hand! I have spent hours with impact drivrrs/heat etc, now it the screws don't move first attempt, easier to drill.

Sent from my X6pro using Tapatalk

Simon46:
Are these jis screws? Bought some bits from motion pro and they work well if that helps?

SumpMagnet:
I must have upset a gypsy or three .... who placed a curse on me.

shifted 2 screws using impact driver and blunt force trauma. Then the impact driver buit shattered. Now I got to wait a few days while a replacement bit arrives. Can't get a driver bit locally...though I could buy a whole new cheap impact driver....just not the one bit I need.

Still...that's half the fun

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