Blast from the past - SP 108

[BoundForElsewhere]

Thanks for sharing the 108 HP service manual! A rare find and nice addition to the SP files.
For the fun of it, here is the MKVIII & 108HP combo from the 1982 catalog.

View attachment 865348

what is that tube strapped to the gauge hose?

 

[Kupu]

what is that tube strapped to the gauge hose?

A tube of silicone grease for sealing the first stage.

 

[Kupu]

Couldn’t let it go, I think this is the original 108 (that gets upgraded to 080 HP)?

It's been awhile since I looked, but I think the early version 108 shown in that thread cannot be upgraded due the design of case and demand valve body as shown in my photos in this discussion.. Something along the lines of how the early case was not threaded to fit the demand valve body, but later 108 bodies had a threaded connection.

I'm guessing the case was changed over to the upgradable version about the time 108s with a larger single exhaust valve replaced the early 108s with the small double stacked exhaust valves.