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Air Gun Home Forum Index » Rifles » Diana 48 Breaks down.    View previous topic :: View next topic  Diana 48 Breaks down.   Posted: Wed Dec 24, 2008 2:28 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Even though the problem has already been solved, I'd still like to share this story. A couple of weeks ago I got my Diana 48 (a little twangy 14-15 fpe) tuned by my buddy Jan. He made a custom top hat out of the last bit of Delrin he had, but he couldn't make a springuide, so we decided we'd put in an original spring guide he had laying around, which was the same shape and size as the one that was in there, only it looked a lot better, and the fit was nice and tight too. The spring we used was a JM de-tuning spring. I have the feeling that the old Diana spring in there was something like a 12 Fpe version also. Result from the was 14-15 fpe without twang. Pretty good for a de-tuned D-48 so I figured I'd just stick with it. When I fired a few shots this morning, I noticed a twang. I gave Jan a call to see if he was up to anything, and since he wasn't I figured me and D would drop by. Just to test the rifle, Jan cocked it and fired a shot, then another and at the thirds it didn't cock anymore. The darned thing got stuck half way. So we opened it up, and what came out of there wasn't pretty. The Diana's spring guide was in two pieces. It broke off by the foot. I was quite pissed off, so I decided to go all our and just order a full power Maccari tune. I guess if you really want to do it right, you better go all the way. _________________ BIG GAP   Posted: Thu Dec 25, 2008 1:33 am Amigo Veteran Member Joined: 18 Sep 2008 Posts: 263 Location: U.S. MidWest Broom: Quote: and the fit was nice and tight too. Often, too tight of a fit of the spring to guide is not nice. Amigo   Posted: Fri Dec 26, 2008 7:01 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Then why do Maccari kits come with springs that are really tight in there? I have the feeling it has more to do with the piston-pin, the spring, and the spring guide not being tuned in to each other. The JM spring was simply to powerfull for the spring guide. _________________ BIG GAP   Posted: Fri Dec 26, 2008 2:42 pm 23ib0d0n Moderator Joined: 21 May 2007 Posts: 757 broommaster2000 wrote: Then why do Maccari kits come with springs that are really tight in there? I have the feeling it has more to do with the piston-pin, the spring, and the spring guide not being tuned in to each other. The JM spring was simply to powerfull for the spring guide. I've had several broken Diana guides. They're made of 'junk plastic' while tuners use more costly thermoplastics or metal for the guides. The ARH springs are a higher quality spring wire with better QC during winding and tempering, therefore not as brittle nor as prone to breaking as the factory units. After having several Diana, HW, and Gamo springs 'cant', crap out or 'explode', I just put an ARH kit in as soon as I get a new bbgun, and I haven't needed to replace an ARH unit yet. Some are nearly a decade old with no signs of wearing out evident thus far!   Posted: Sat Dec 27, 2008 12:47 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands ARH? _________________ BIG GAP   Posted: Sat Dec 27, 2008 4:48 pm 23ib0d0n Moderator Joined: 21 May 2007 Posts: 757 broommaster2000 wrote: ARH? Air Rifle HeadQuarters   Posted: Sat Dec 27, 2008 4:50 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Aha, THAT "ARH"! _________________ BIG GAP   Posted: Sun Mar 01, 2009 6:38 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Since the Maccari tune, Diana has been doing better and better. I gained another FP by breaking in, or so it seems. I'm now doing 255 Meter per second with Baracuda Extra Heavies. Something like 16 Fpe? I heard that Maccari tunes in .177 Diana 48's do about 17.5 Fpe in the best scenario, so I guess I should be kind of happy. My buddy who tuned the gun had to shave off a few mm's from the top hat so that the gun would cock. _________________ BIG GAP Diana 48 Breaks down.     Air Gun Home Forum Index » Rifles You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 1   All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." 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