The photos here show the huge amount of wear on the crankshaft and flywheel hubs. There had been numerous repairs to the hubs, too many to accurately count, but they range from cold welding, pieces of shim, badly made keys, dual keys in the same key way, pieces of metal hammered in along the worn shaft, sleeves around the hubs etc etc. The crankshaft was also broken, but that will be dealt with under the crankshaft repair section. Crankshaft repair
Also the edges of the hubs were badly eroded from being hit with a hammer when trying to hit home the keys and shims. From this point we decided to take the drastic measure of totally replacing the hub internals and facing off and replacing the damaged hub faces.
The work was done by my long time friend of some 38 year, John Hartley of Hartley Engineering in Mayfield, Newcastle, NSW, Australia. This was a big task, but John has a lathe that can swing the 24" flywheels so that we could do the repairs.


The repairs to the flywheels were quite extensive, the life of this engine in Argentina was one of total slavery and abuse.
The first photo shows a red arrow pointing the the badly damaged outer hub area, that I would say was due to constant pounding home of the gib head keys and many sleeves that had been fitted due to the flywheels coming loose.
  The first job was to machine that worn area off, then bore the center and make up an insert to replace what was machined off.    
Then the flywheel rims and faces were skimmed to remove the chips, rust and damage.
Note: The starting handle in the flywheel was held in place with body filler for safety.

Above: Machining the rim and faces and the completed job. . This is stage 1 completed.
Stage 2:Replacing the hubs
Left: The old hub has been faced off, the center bored out over size to accommodate the new hub and a retainer ring shrunk over hub. This was held in place with Loctite 680. The white area is Loctite primer.
Right: The new hub centers and outer hub all in one piece. This part is keyed into place into the old hub and held with Loctite 680.


Once the new hub is in place, it is drilled through into the old cast iron hub, counter bored, tapped and a socket head bolt was inserted slightly below the surface. Loctite 680 was used on the bolts and they will be covered in liquid metal and sanded level to the face.
So that is it in a nut shell, I now have two new flywheels.

  This is the new hub, the center bore is the new crankshaft size, the key holds this new part into the old machined out hub. The flange replaces the worn section of the hub that was machined off.
Both flywheels finished, now to clean off paint with a light bead blast, The machined areas are painted with rust protector.
Next job is to paint the flywheels.