Warn weather cause dieseling/detonating?

[Odins_Mercy]

Hey yall,
Does warm weather cause moly or grease further travel up past the compression chamber?

I wad shooting a Gamo Magnum GR .25 and having a solid time, then BAM it sounds like a 22. Had a "ping" at the end. Happened 2 to 3x forgot but I quit shooting and am storing the gun barrel up.  It's been 10 minutes since then. Full smoke and all. Sounds like a problem and I hope I don't gotta tear it down and decrease and relube everything

I don't have a spring compressor. 😕  I could tear this down I've found many videos but to actually solve this WITHOUT a compressor, what should I do? Also, do you think I should get a piston seal replacement? I've read Gamo catalogs state that
”Repeated test-firing – before launching any new rifle to the market, Gamo tests them by dry firing each rifle model 100,000 times (10 units are shot 10,000 times each). Once the product is launched, two out of every 1,000 are tested again with 10,000 dry fire shots." Or spring replacement if I can even find or buy one lol.

Any opinions would be super valuable. 

[Roadworthy]

Dry firing can damage seals from repeated piston slamming against the end of the compression tube.  It can also shatter the spring in coil spring guns.  It's not recommended.  In your case I suspect the piston seal is allowing a bit of your lubricant in front of it as it is no longer scraping the compression tube as well as it once did.  Your power may be down a bit as well.  It appears to me from the symptoms you're due for a new piston seal.  You may wish to replace the spring while you're in there but it's a separate issue.

[Odins_Mercy]

Yeah thats what I'm gathering. I found some stock piston seals for the 33mm ( or 29mm actually) piston gamo advertises, I guess I'll have to give that Air venturi spring compressor a try and figure out where the heck I'll get a spring for this.

Off the rail a bit how and where would I gather what springs could be compatible with this Gamo Magnum GR?

Dry firing can damage seals from repeated piston slamming against the end of the compression tube.  It can also shatter the spring in coil spring guns.  It's not recommended.  In your case I suspect the piston seal is allowing a bit of your lubricant in front of it as it is no longer scraping the compression tube as well as it once did.  Your power may be down a bit as well.  It appears to me from the symptoms you're due for a new piston seal.  You may wish to replace the spring while you're in there but it's a separate issue.

[Roadworthy]

How old is the gun?  Is there a chance it's still on warranty?  If so Gamo might fix it.  If not you may be able to buy the necessary parts from Gamo though they will probably want to ship to a licensed firearm dealer - they do that a lot.  Beyond that you could try Vortek, I understand they've been getting more into Gamo parts.

[Tater]

Moved to the Gamo gate.

[Yogi]

Mike,

My guns never used to smoke after a shot.  Then once I had to shoot in 105 degree weather, full sun too, and smoke billowed out when I opened the barrel to reload.
Since then I have changed over to Ultimox, a non-combustible lubricant.
Get or make a spring compressor, with your GAMMO you will need it.

-Yogi

[Odins_Mercy]

I got it on Jan 22 2024, I'm about to send it to Gamo and get that warranty on. Who knows.  Maybe they'll send back a Gamo Hunter extreme in .25 bahahaha. I believe my issue is using old types of lubes and greases and it's caused issues. I gotta get this fixed and cleaned at Gamo, buy some Krytox or ultimoxx. A spring compressor and just get dirty and do it. ( ughhhhhh )

How old is the gun?  Is there a chance it's still on warranty?  If so Gamo might fix it.  If not you may be able to buy the necessary parts from Gamo though they will probably want to ship to a licensed firearm dealer - they do that a lot.  Beyond that you could try Vortek, I understand they've been getting more into Gamo parts.

[Odins_Mercy]

I activated the warranty, got some pdf on home made compressors and gonna buy the air venturi compressor as a quick fix also and get that lubes.
I gotta call gamo after work, and get it done.
I tried to avoid this but the warm weather has forced the hand lol.

I shot it this morning after a night barrel up and sounds better but, gonna get all sealsnand stuff replaced.

Wish me luck haha

Mike,

My guns never used to smoke after a shot.  Then once I had to shoot in 105 degree weather, full sun too, and smoke billowed out when I opened the barrel to reload.
Since then I have changed over to Ultimox, a non-combustible lubricant.
Get or make a spring compressor, with your GAMMO you will need it.

-Yogi

[19Sheridan57]

   Since it is brand new, I would shoot it a lot more before sending it back.

[Novagun]

Yes shooting it a bit more makes sense to me. Maybe the gun dislodged a bit of oil that will burn off. Your chrony help you tell if the power drops off more.

[Odins_Mercy]

Yes! I stored it barrel up and after 2 days I guess the lubes migrated back. I used the wrong lubes and learned of high flash points too late. I'm blowing through 500 pellets this weekend and sending it to Gamo for a spring replacement and piston and breech replacement and clean out. May as well I'm in Warranty -shrug-

Gotta get some krytok and other stuff and a clamp to due this myself ugh

   Since it is brand new, I would shoot it a lot more before sending it back.