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Couple gun queries

F

FlotsamBob

New Member
Dec 28, 2022
3
0
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36
Seasons greetings dear tinkerers!

I have a couple relatively new pneumos that are playing up, although not totally without potential fault from my side, and may need some tlc before next season.

First up is a Cressi Saetta Pro shorty with selector handle going a lil too far astern, almost poking out at an angle from its guide groove at full power setting. Have I pumped this thing up too much?

Next is my main workhorse, a Mares Cyrano 1.3 110cm with a selector knob shaft which appears to be puffing mini oil globules (underwater) every time it's actuated. Suspecting a lil rust spot on the selector shaft is to blame. Is this a simple standard o-ring that needs replacing? After adding a Salvi Vuoto nozzle this gun really sends a fast shaft, nevertheless could an STC piston and trigger release make it even more efficient? Which is the best piston damper to get (Salvimar?). Any other good upgrades?

Appreciate your time and pondering with me.
 
popgun pete

popgun pete

Well-Known Member
Jul 30, 2008
4,577
1,312
353
Any high pressure inside a pneumatic gun is trying to push the power regulator selector lever back in the gate. On the Cressi Saetta model it is normal for the selector lever to be leaning on the rear of the gate. If the lever is angled out of the gate then it could have been bent, although that is unlikely. The selector lever screws into the rear of the power selector rod. To remove it you have to dismantle the gun and access the power regulator block, not a job you want to do unless it is really necessary.
Cressi Saetta with regulator diagram annotated

A puff of oil coming out when operating the power selector means there is a scratch somewhere, if it was an "O" ring cut then air would continue to leak bringing oil with it. As it is a momentary loss it is possibly a mark on the control shaft or just possibly an "O" ring nick which is moving into contact as the "O" ring slightly rolls on the shaft pushing through it. With no movement the “O" ring still seals. At some time you will need to replace the "O" ring and at the same time check the control shaft for marks. They are usually stainless steel, the rear end pokes out into the gate access tunnel, so you don't want sand going in there and grease should never be applied there as grease is a magnet for abrasive sand particles.
CYRANO 13 PARTS DIAGRAM
 
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