1953 BSA A10 small journal size

[Adtrac]

 I have pulled my 1953 A10 engine down to inspect damage to crankshaft , one damaged connecting rod needs replacing  , bearing shells no white metal remaining  but crankshaft looks not bad considering.
the measurements that i have come up with are timing side 1.447 and drive side 1.443 .
What undersize does this equate to for regrind?

[muskrat]

G'day Adtrac.
-20 is your next grind. Your SJ figures are on the left.
Cheers

[Swarfcut]

 No doubt a new machine is diverting GB from his established role.  The reason for any damage to the journals is more likely to be a consequence of neglect and must be resolved otherwise the same thing happens again.

 Here's one I made earlier.... A classic failure in every sense.

 Swarfy.

[Adtrac]

The reason for the need for crank grinding is  the engine had been run without oil with a broken oil line , long story happen3d 30 odd years ago at least

[muskrat]

G'day Adtrac.
What measurement is the timing side maim journal? It may need doing and a new bush to suit.
Make sure the grinder knows the radii for the sides of the journals. The most common cause of crank failure.
Cheers

[Adtrac]

Certainly needs new bush as it has eroded away  leaving deep pits but the journal is nice and smooth , the size of the journal is 1.367 inches