Swing caliper - parts identification

[petefromoz]

Hi All, I may be overthinking this ... but I'm currently sorting/cleaning a bunch of Girling swing caliper parts for my P6B restoration. I have a couple of variants - please refer to the images.
1. The covers (part 605629) are either plain or have bilateral indentations. My car has one of each! The K296/1 service kit appears to show both. The WM and PM appear to show the plain version.
2. The pushrods (part 601928) have either a fully threaded shaft or half-shaft threading. The K296/1 service kit appears to show the half shaft. The WM and PM appear to show the full version.

Which to use? Does it matter anyway? Any explanations will be gratefully received.

Pete.

 

[mikecoombs]

I think the covers were likely changed as a noise reducing strategy, to prevent ringing. The piston only requires the shorter thread, the remainder just makes it harder to turn back and wears the die out quicker in manufacture.

The parts and workshop manuals need to be printed and available as soon as the car comes out. Consequently the authors use the parts that are in use or being tested some time before the cars production run starts. Plus the drawings were all hand done and no one wants to change something of no consequence if they don't have too. The notes in the parts kits tend to be closer to the parts in the kit so they don't get returned as incorrect...and its just one sheet, not buried in a book.

 

[petefromoz]

Thank you for your guidance. Much appreciated.

Further to the Girling swing caliper rebuild ... I decided to track down some vapour corrosion inhibitor paper (VCI) to cut for purpose. One bloke was overjoyed to donate a fresh end-of-roll section. See image. I think I have enough to meet international demand! Here's a P6 boot lid and an original 50YO paper for size comparison.