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sl star 40

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DeepAbyss

Active Member
Feb 11, 2018
140
3
33
hello,
I have an old sl star 40 speargun.
After releasing the arrow, I hear there is a leak of air.
Anyone have experience with that? what needs replacing?
o-ring set? piston?
And if there are any more successful alternatives or require cressi replacement original parts?

Thank you
 

popgun pete

Well-Known Member
Jul 30, 2008
4,107
1,096
353
Cressi-Sub have been making that gun for decades and are generally cheaper than say a Mares gun to buy, so use the Cressi-Sub kits which can be found on-line easily.
 

popgun pete

Well-Known Member
Jul 30, 2008
4,107
1,096
353
Thx,so set of brand new o-ring can solve the air leak?
Should do provided no cracks or gouges in the plastic parts if someone clumsy had opened it up and then given up, which is unlikely. Replace all the seals after cleaning the gun parts and leaving them to dry, a wash in soapy warm water gets rids of any remaining oil and then a rinse and dry. Use a dab of grease or oil to lubricate each ring which aids it going back into place. Read the gun dismantling thread first so you know what you are going.

As the inner barrel is not co-axial don’t twist parts on the inner barrel, just pull them off
 

DeepAbyss

Active Member
Feb 11, 2018
140
3
33
Thx, the o-ring is diffrent from brand to brand or its can be some brands the same sizes?
 

popgun pete

Well-Known Member
Jul 30, 2008
4,107
1,096
353
Thx, the o-ring is diffrent from brand to brand or its can be some brands the same sizes?
The body rings are thinner on the Cressi guns, so it pays to use the Cressi kit. It was about half the price of the Mares kit when I last bought one.
 

DeepAbyss

Active Member
Feb 11, 2018
140
3
33
Thx,after i realse the arrow i need to hear air get outside from the muzzle its normal or its a leak that i need to test in the water if there is a bubbles?
 

popgun pete

Well-Known Member
Jul 30, 2008
4,107
1,096
353
Thx,after i realse the arrow i need to hear air get outside from the muzzle its normal or its a leak that i need to test in the water if there is a bubbles?
If you sink the pressurized gun in a tub of water there should be no air bubbles coming out of it after all trapped air has escaped as happens with any object when you first submerge it. Any stream of bubbles that continues after that is an air leak which you don't want. As the guns usually float you can put something heavy on it to make it sink
 
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