C60 Differential rebuild

[Ken Thomas]

Hi, I am replacing the pinion & ring gears in the diffs of my C60.

I notice that among the diffs I have (5 of them), some have 8 bolts holding the differential case together i.e. one either side of the 4 pinion shafts & some have 12 bolts. That is an intermediate bolt between each pair on the 8 bolt assemblies. Fig 16 in the 1943 manual, page H- 9 shows a blank space between the bolts (opposite on the parts of the carrier marked X) where the twelfth bolt is situated. See also fig. 15 page H-8. The 1942 manual has similar pictures & the 1942 parts list book I have only lists 8 bolts in this application. My question is; is the 12-bolt unit a later production idea to give the unit more strength, or was it an earlier idea that was deemed not necessary? This last option does not seem correct.
It would be my preference to use the 12 bolt carriers. I would like to hear your thoughts on this.

Further: I have new pinions & ring gears, but no rivets. Does anyone in Australia know where I could get some (28 of them)? Or could anybody provide me with a sample that I could copy or dimensions, especially of the rivet head & I will make them.

I also have plans for a riveting jig but would appreciate any information that anyone could give me in that regard. I would love to hear that someone has one but that is probably too much to imagine. It has been suggested that I use hot riveting by hand, but I do not accept that this gives the same quality of work. I have press capacity to cold rivet.

I would like to hear any & all suggestions, experiences etc. that you have.

Thanks
Ken Thomas C60.