392LE (2007ish?) first ever leak and probably lube question.

[Relentless Holiday]

OK so the gun above was taken out for a shoot after about a year for some shooting because I have been really enjoying a new pumper recently and pumping indoors during this dank raw spring has been filling my need for trigger time.

This 392, untill now flawless beauty, took 4 pumps...sometimes half a fifth and started dumping further pumps out the breech area.  ...not hissing out the muzzle..

So common sense says to give it a little pelgun oil, or whatever is better if I discover sumthin' through this post, as a staring point.   But I figured I'd ask first....

My question is to you pumper pros.  Where to lube it with what and how much as a starting point?

It was stored faithfully with two pumps since bought. A year ago it was fine, and now the leaking/pump pressure loss starts at the first 1/3 point though the fifth pump consistently.  Admittedly my understanding of the valve holding capacity is...  MIA.  So a comments or leads/links to the knowledge I need to make it a happy gun would be welcome and appreciated.

Thanks guys

Edit:  Opps sorry mod boss... not a older gun...just older to me.  Plz feel free to move to different gate, my bad...

[Habanero69er]

Secret Sauce.
From Mac-1 site:
Don't overdo it, a few drops at the front pivot & rivet is all you need on those two. The pivot that connects the lever link to the piston end that guides it is a porous piece of steel. Put 6-8 drops of Secret Sauce on that pivot as the guide end of the piston acts as a storage of oil so a film is laid down on the tube each pump stroke. All else will get taken care of by blow through.
Never put lubricant in the air hole.

[Rob112o]

If it's coming out the breech area it's coming out the barrel as well. Your just hearing it more out the breech. Either because you have it cocked already or your bolt probe oring is toast. If this is the case, I'm sure it's leaking on less pumps too. You just might not be hearing it until greater pressure is built. Check to see if bolt probe oring is good by pumping it, cock it, close bolt, lay paper towel/tissue over bolt, and fire. If the tissue doesn't move your bolt oring is good. Now pump the rifle and listen at the muzzle. If no air noise can be heard here and you clearly only hear at breech area. Your valve nut most likely has come loose and you need to tighten it.

[Relentless Holiday]

Secret Sauce.
From Mac-1 site:
Don't overdo it, a few drops at the front pivot & rivet is all you need on those two. The pivot that connects the lever link to the piston end that guides it is a porous piece of steel. Put 6-8 drops of Secret Sauce on that pivot as the guide end of the piston acts as a storage of oil so a film is laid down on the tube each pump stroke. All else will get taken care of by blow through.
Never put lubricant in the air hole.

10-4 on the sauce, ordering it now.   thx Ive read about sunthin but couldn't recall... that was it.

[Relentless Holiday]

If it's coming out the breech area it's coming out the barrel as well. Your just hearing it more out the breech. Either because you have it cocked already or your bolt probe oring is toast. If this is the case, I'm sure it's leaking on less pumps too. You just might not be hearing it until greater pressure is built. Check to see if bolt probe oring is good by pumping it, cock it, close bolt, lay paper towel/tissue over bolt, and fire. If the tissue doesn't move your bolt oring is good. Now pump the rifle and listen at the muzzle. If no air noise can be heard here and you clearly only hear at breech area. Your valve nut most likely has come loose and you need to tighten it.

And thanks to you Rob,  I like the sweet n simple diagnostics.  The prob ring looks OK but I will certainly check how you suggested.  Hoping I don't have to go in...I'd rather be shooting...

[only1harry]

Moved to the Crosman/Benjamin Gate.

Harry

[Relentless Holiday]

Thanks guys it seems to be sealing much better.  A GTA donation has been made in honor of your help on this gun.

 

[Rob112o]

Glad to be of service. Happy shooting now brother.

[Relentless Holiday]

Glad to be of service. Happy shooting now brother.

Yeah Yeah! Go GTA!