Scubapro 108HP

[Open Ocean Diver]

Hey all hoping someone can help me out here.

looking at the schematic for the 108 HP there’s a part that’s called insert housing 21-080-121, I think I’m missing this part from mine. I have the nut, plastic washer, lever and poppet.

Any idea what this part is?

Thanks,

 

[rsingler]

The Housing Insert is a small plastic bit that sits under the lever feet. It is broached square, and the two wings on the side fit into the housing slots. This enables you to adjust the nut on the poppet without having the poppet rotate in the housing. Without it, the lever fulcrum will be the housing itself, which will seat the lever slightly deeper in the housing. It will also be more prone to catch as a metal to metal contact. Finally, adjusting without it will be quite difficult since the poppet does not have a small screwdriver slot, as I recall. lf there is a screwdriver slot, then it's not a big deal, except for the added friction under the lever.

You can still get the part, because it's used in the Air2.

 

[Open Ocean Diver]

The inlet tube is square, I guess I’m missing a part. The cracking effort is so low thought I had a weak spring, so I replaced but no help.

 

[rsingler]

Maybe not. The Housing Insert takes a round hole and adds a square broach. Yours appears to already be built in.
Can one of the 108 experts chime in?
@couv @Luis H @herman

 

[rsingler]

Had to go back to my oldest schematic. You have great chrome for such an early model.
Configuration 2 from ?1979? came without the insert, like yours. Looks like a straight 108, rather than the High Performance.

 

[Open Ocean Diver]

Had to go back to my oldest schematic. You have great chrome for such an early model.
Configuration 2 from ?1979? came without the insert, like yours. Looks like a straight 108, rather than the High Performance.
View attachment 599246

Thanks one drawing I was missing.

Whoever had it before me either took really good care of it or never used it, doesn’t have a single scratch.

I just can’t get it to crack at the manufactures specs. I have the nut on exposing 1 or 2 threads, to get it to crack at say 1 the lever is to low and I end up with low purge flow.

 

[rhwestfall]

Yep, 108, not 108HP. The 108 had a fixed seat, and the 108HP has a removable orifice like the 109/156

 

[Open Ocean Diver]

Yep, 108, not 108HP. The 108 had a fixed seat, and the 108HP has a removable orifice like the 109/156

This one has the removable orifice.

 

[Open Ocean Diver]

I wonder if this is a mismatched reg. 108 case with a HP demand valve body and adjustable orifice?

 

[rhwestfall]