What am I forgetting?

[trevinoz]

How about just grabbing the case and giving the whole assembly a good downward whack against a block of wood.
That is with the drive shaft contacting the timber.
It may take a couple of hits but should work.
Only for those strong enough to lift the works! 

Trev.

[muskrat]

Back on topic. As stated the gearbox must be removed before the cases can be split. To remove it without dis-assembly the bottom studs must come out to be able to slide the gearbox out to the right. The only other way is to dis-assemble the gearbox and remove the mainshaft. The box will then come off the studs. Been a long time since I've done it.
Cheers
The A50/65's can be split with the gearbox intact.

[bsa-bill]

It's a riveted on seal retaine

can this not be removed somehow and made removable or put back, seems like it must be put on after the gearbox is fitted, wouldn't this be the way BSA assembled tem

[bikemadinspain]

Ok, just had a go with a fine blade, the cases are separating via the blade but I still cannot see how this casing can come apart with the gearbox connected. Surely I do not have to totally dissasemble a gearbox to separate an engine!!!

Personal for a10gf, initially read your post and thought here we go a computer geek giving me advice about a topic I have no idea about, then for a change I concidered it, then I read the instructions for my camers (I have owned it 11 years) and low and behold I now know what you are on about. I have reduced my pixel size and ta dah, u should see what I can now do with my camera its fliipin great!!
Many thanks

PPS: Just read Muskrats post now off to tackle the studs.... cheers

 

[bsa-bill]

To remove it without dis-assembly the bottom studs must come out to be able to slide the gearbox out to the right.

DOH  remove studs, why did I not see that - I must be getting old, no  I am old just not thinking out of the box (did you see what I did there)

[bsa-bill]

To remove it without dis-assembly the bottom studs must come out to be able to slide the gearbox out to the right.

DOH  remove studs, why did I not see that - I must be getting old, no  I am old just not thinking out of the box (did you see what I did there)


let us know what you find in there

[muskrat]

 And 9 times out of 10 the studs are replaced with bolts 
Cheers

[a10 gf]

As shown in http://a7a10.net/forum/index.php/topic,6692.msg46393.html#msg46393 you must remove the gearbox, that's why I posted the picture showing the 2x crankcase studs\nuts behind it, of course do not try anything before those are removed.

About the gearbox shaft, here it can glide trough the seal, with a little wriggling and oil, no problem, but be careful to not damage the seal with edge of the splines. When the seal was changed some time ago, I replaced rivets with small bolts\nuts.

offtopic
Congrats++ about the picture, 640x480 does the job, some larger sizes works as well, like 800x* or 1024x*

[bikemadinspain]

OK, studs out, final two bolts out, case split no problem, now how do I get that final spindle off the end of the cranksahaft to separate the crankshaft and flywheels from the final casing?   I am on the last fence I think!!!

[a10 gf]

The shaft pinion? Needs a suitable puller + maybe heat, patience, care etc

[muskrat]

 Looking at yesterdays picture the inner timing cover was still on. 4 screws gets it off, the idler gear and shaft may come with it. Put the idler gear back into the gear train and use a nylon or timber wedge between gears to remove the cam shaft nut. The lock nut and worm gear on the crank shaft are LEFT HAND thread, remove these and the 3 nuts for the oil pump. Now you get to the pinion that a10gf has pictured. Remove the idler gear and use pullers to get the cam and crank pinions off. Do not try to force the shafts through the pinions as the bushes will suffer.
I normally do all that before I get the motor out of the frame.
Cheers

[bikemadinspain]

Unforytunatly I fell at the next fence, question one, how do I get past the key on the camshaft and pic two with the last small wheel (technical term) any other way to get it off other than a puller?

PS: Thank god this forum exists......

[trevinoz]

Remove the key, give it a tap at the inner end with a pin punch and the outer end will raise.
A screwdriver and small hammer will knock it up and out.
The pinion can be removed with two screw drivers carefully wedged behind it in most cases.
If not, a puller is required.
I have never used a puller on this pinion.

Trev.

[bsa-bill]

I have never used a puller on this pinion

Me neither, small pry bar behind and a gentle tap with the plastic hammer usually pops off

[a10 gf]

any other way to get it off other than a puller?
PS: Thank god this forum exists......

About the forum, topics like this one are the exact goal & motivation for the very existence of the forum.

As others suggested, try without, but careful not to damage anything. Am using a puller (which I machined to fit the job, and the pinion is made to use a puller > the slots), works fine (using the puller + heating & some light taps), it's a damn tight fit here.