What’s the size spanner to use here?

Flatspot

Flatspot

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It’s “cycle” I assume holding this adaptor onto the engine as nothing I own fits it 5/16, 11/32, 8mm, 9mm - if only I had an adjustable socket or even a 8.5mm

Help, progress is otherwise halted on the strip down.
What’s the size spanner to use here?
 
Panic now over. A 5/16” AF 6 point socket will go on if persuaded. Now all 3 bolts are removed but the flats will require massaging to make refitting much easier.


Now the bloody sprocket won’t pull off. I’ve put a 3 leg puller in behind it, but it won’t budge, despite penetrating fluid and liberal heat from a butane torch. I don’t want to do anything that is going to hurt the crank or cases, but I’m scratching my head right now.
 
Flatspot said:
Panic now over. A 5/16” AF 6 point socket will go on if persuaded. Now all 3 bolts are removed but the flats will require massaging to make refitting much easier.


Now the bloody sprocket won’t pull off. I’ve put a 3 leg puller in behind it, but it won’t budge, despite penetrating fluid and liberal heat from a butane torch. I don’t want to do anything that is going to hurt the crank or cases, but I’m scratching my head right now.
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I'd switch to socket head Allen's when refitting if available

Heat it up then blast it with chewing gum removal spray.
 
Triton Thrasher said:
Are you working on a Pre-unit Triumph without Whitworth tools?
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Partially. I have a set of Whitworth combination spanners alongside several comprehensive sets of the usual AF and Metric. I don’t know what ever happened to the ones I used to use when I started biking 50 years ago. Actually I don’t think I had any anyway 😂

What caught me out was this recessed bolt that needs a small socket. It was defeated by use of a 6 point 5/16” AF socket that finessed its way deeply enough for me to undo them. 3 new bolts on order, along with a suitable socket set. I won’t be beaten.

I am getting grief at ever step I take though. The crank nut came out with the stud still attached,OK not really a worry as I’ll replace both items. Then despite heat and a puller the sprocket wouldn’t come off. A grinder made enough vibration and localised heat for it to finally, slowly pull off.

New sprocket required. But as the clutch basket has also endured over 60 years of use, it is also well mullered and I’ve a new one on order. With all new plates, springs, adjuster screws and cups. If I’m going to do it, then I’ll do it as best as I can.

After taking off the inner chaincase, with a chunk missing at the rear :mad: I have unbolted and removed the gearbox and noted the cracked engine plate :rolleyes: - but I’ve new ones on order anyway, so once again not a worry.

Perhaps I’ll strip the gearbox and have a look inside at the state of the bearings and gears etc. and do a delete of the shitshift mechanism ;) get the casings vapour blasted for a better finish and, and, and, and

Well before the “and” I’m taking a couple of months away in the motorhome so no more progress until later in the summer.
 
Flatspot said:
Yes the current number is 70-3979

I didn’t attempt to use an 8mm with 6 point head because mine are 12 point.
Click to expand...
My fastener data base has:

What’s the size spanner to use here?


Since it is "Small Hex" is is not the normal size for 5/16" BSF and I don't know the AF. Please let us know when you figure it out so I can update the listing.

Fastener Database

Greg Marsh Enterprises Vintage British Motorcycle Parts and Service
gregmarsh.com

Just from what you said, I still suspect 2BA
 
I’ve got a Whitworth set of sockets arriving towards the end of the week. I’m hoping the smallest, 1/8thww will suit it.
 
The various "BA wrenches are a godsend. Where does one get them these days? Also, I need a 5/16 WhitWorth and when I ordered one from Snap-On I got a 5/16 BS. So now I have 2 ea. 5/16 BS and one broken 5/16 WW.
 
Whilst I have already removed the bolts as described above, my new Whitworth sockets arrived today - secondhand bargain off eBay, nope they’re actually new unused - I test fitted a socket and 1/8WW fits it a treat.
 
Checkout old tools in the back of junk shops , for dog leg ' Cycle ' BSF etc etc spanners , Brutalised ones spread , so fit next size up !! or NOT fit ,

So ' anything goes ' but cheap soft modern cheap Jap Stuff . Which we wouldnt put on British Motorcycles . WOULD WE .
Bearings were British , Swiss , Or German . But some prefered shooting THEM . STONEING inside hex'es , for exact fit of rotten old ' custom ' spanners ,
Cutting / welding / Making ' custom ' pullers etc , was par for the course , in the back blocks .

The Magneto drive Gear wheel ! The Mag. Shaft is BRASS , and V thin before 56 ( smaler bearing THERE too - shafts smaller ) SNAPS . If Abused , Dont Lever It About .
at worst , lossen three bolts = shift mag and tap shaft center with your copper hammer . You gottat the junk shop . Or Nylon One , Bench Grinder & you can customise and polish for hours .
The Destitute Found holes cheapest , as lighters faster . Hand Drilled in the garden Shed .

What’s the size spanner to use here?



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