http://www.airgunfix.com/blog/airguns-assembly-disassembly/disassembly-tutorial-crosman-gamo-theoben-and-others/

Nice work Jon,
Lookin good.:thumb:

Thanks Craig - let me know if I missed anything. When I first started I couldn't find a tutorial I could follow easily so hopefully this comes in handy for others...

You got it covered buddy,
very nice job.

Brian - To answer your question on my image, I actually opened all the photos in photoshop and manually colored all the parts that needed to be highlighted. Making screw hole plugs is a great idea - I'm sure someone can whip them up easily with some delrin or something...

Great tutorial Jon!

Jon you did one hell of a job on your instructions to dismantle and Air Gun (Rifle), the only exception that I noted when reading it, is you may want to add a big caution in red "USE EXTREAM CAUTION, MANY OF THE METAL PARTS MAY HAVE EXTREAMLY SHARP EDGES THAT CAN AND WILL CAUSE CUTS and INJURIES TO YOUR HANDS AND FINGES". It is left out of every owners manual, and we all find out the first time the hard way, and a bunch of band aids. Just a suggestion and thought.
Then at the end of your instructions, advice them to use caution and with 220 grt/ 400 grt sand paper, or small file or emery board, to remove all sharp edges found, so as not to do any damage to the New Seal when being installed and to use caution and go slow when reinserting the Piston & New Seal so as not to cut or damage it on an unremoved sharp edge, and this should cover it completly.
This is the stuff we learn the hard way on our first couple of tunes or service. Brian

Excellent suggestion Brian - thanks!

Very nice! I was thinking about taking mine apart very soon for my first self tune - this definitely helps alot!

if you need any assistence just holla.

is it me, or should this thing be stickied? cause i think it should be!!
never mind, it already is

by the way what could i use besides a spring compresser? to release the pressure for the spring?

I know of no safe alternative to a spring compressor. There are probably a few guns out there with no pre-load on the spring but I wouldn't count on it.

Ray

This is a great tutorial. Something I think is great to see step by step pictures.


Hey Ray I'm already looking at that trigger for the Talon

by the way what could i use besides a spring compressor? to release the pressure for the spring?


you can use you two bare hands on stock springs but new springs are unset and very dangerous to install by hand.
when doing this by hand (which i don't recommend, as a spring compressor can be had for around 20 bucks)
it's good to have a third hand ready to remove and install the pin, thus keeping your two hands on the action.
if you have tiny arms you can put a towel between your chest and the action and use your chest and two hands to press on the action.

when the action is compressed properly the pin slides right out with no hammer.

this is all dangerous so just go to the hardware store and pick up 3/4 pipe clamps for 15 bucks and a 36" 3/4 black pipe for 5 bucks and your in and much safer then handjobbin it.

this advice pertains mostly to Crosman springers, so with other brands tension could be much higher.

Many have tried the no compressor route but eventually realized that it was worth the couple bucks to just make one, especially considering you may have to get back in the rifle a few times before it's really shooting the way you want it to. By that time, you'd be exhausted from messing with the spring alone. Getting the stock spring out isn't that hard, but it can be dangerous and you can mar up your rifle or its parts good by doing it that way. Getting your new spring or even the stock one back in and lining up the holes makes it a challenge without a compressor. Plus, you can bugger up your receiver and scratch it up when trying to remove and reinstall a spring without one.

Jons right, when i got my compressor together i couldn't believe how easy the job becomes.
and sometimes i find myself going into a gun several times before I'm happy with it.

don't forget your saftey glasses:cool:

I just got a longer bar clamp to use as a spring compressor, $9.99.

30" Bar Clamp (http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=96486)

Once I get everything back together the stock lug brace is loose and you can hear it moving around in there if you shake the gun. Is this normal?

That happened to me once. It just suddenly got a little loose. I added a shim I cut from a rubber mat to the stock and it solved the problem. Btw, welcome!

Thanks and thanks.

Is there any way to tell whether or not I tuned it right? I didn't really shoot it when I got it, took it apart right away and started working on it, so I don't really have anything to compare it to. Thanks. BTW I used charlie da tunas B-19 supertune guide.

The end result of a good tune will be consistency in accuracy and velocity. Also, no twang, twist or vibration on the shot cycle. The cocking stroke will be silent and very smooth (no spring crunching or cocking shoe drag on the reverse stroke). No obvious dieseling and definitely no detonation. Just my 2 cents.

There is no twang, and no vi ration really that I can tell. The cocking is smooth and quite, as well as the reverse stroke back. No dieseling or detonation. The only thing I was worried about really is if I used to much heavy tar on the spring that it would affect the velocity, I dont really have anyway to test this. I coated the whole spring in heavy tar, not a heavy layer I dont think, but there was no metal showing when I was done and it may have been thicker in some spots. Also, I got some tar on the inside of the receiver, towards the back of it, when I was installing the spring. Would this have any detrimentally affect on the guns performance? Do I need to take it apart and clean it all out again and re lube and be more careful this time?

Thanks again!

These are those times a chrony would be helpful for your question on velocity. If she's shooting good though, you won't have much to worry about. The tar on the end and heavy spots of it won't hurt...

ok thanks...i took the stock back off it looks like a lot of the tar flung forward due to the pistons foward momentum...i just hope none got where I dont want it. Maybe I can find a chrony somewhere I guess...what should it be shooting at about?

I can't find what you are shooting in your post. I assume since you were using the B19 tune guide, you have a crosman Quest, sierra pro, G1, or variant. With stock spring and seal with a lube tune, you should be pushing 920-960 fps with 8 grain pellets.

ok...its a g1 btw...thanks

Very Nice Article. I have a G1 also and am eventually going to tune it.

Good luck on your home tuning of your G-1 josh. Just pay attention on the way you put back your piston with the new seal so as not to break the seal perimeter. There is a thread in the forum about other members' tips on how to prevent damaging the new seal.

Keep us updated on your home tune. :)

Speedturtle

Well guys I'm going to finally tune my G1! I've been having trouble with accuracy lately and i've hand spotty dieseling. Today I was shooting and was getting loud noises when firing.. And if I shake the gun I can hear something inside moving around...

Here are some Chronograph numbers from a week ago

http://img36.imageshack.us/img36/8471/21840190.th.png (http://img36.imageshack.us/i/21840190.png/)

I found on this site this spring.. will that improve my velocity? and what seal should I get? What other things will I need to tune my rifle?

Thanx

Well guys I'm going to finally tune my G1! I've been having trouble with accuracy lately and i've hand spotty dieseling. Today I was shooting and was getting loud noises when firing.. And if I shake the gun I can hear something inside moving around...

Here are some Chronograph numbers from a week ago

http://img36.imageshack.us/img36/8471/21840190.th.png (http://img36.imageshack.us/i/21840190.png/)

I found on this site this spring.. will that improve my velocity? and what seal should I get? What other things will I need to tune my rifle?

Thanx

Use a Maccari E3650 spring & Apex small seal...
The tarantula spring will fit for more power BUT
will be to lose on the guides...lots of twang..
The guides are to lose for the standard spring
by .5mm
the gun is a Bam B19 re-branded & stocked for crosman..

Well Here are the Carnage pics... I didn't even have to use a spring compressor to disassemble. Just observing that the spring was broken multiple times. I still took precaution and I first tested to see if there was any pressure on the spring guide assembly and it was just floppin around...

http://i388.photobucket.com/albums/oo329/joshheat25/DSC03390.jpg

Pieces of the spring on the spring guide assembly
http://i388.photobucket.com/albums/oo329/joshheat25/DSC03386.jpg
http://i388.photobucket.com/albums/oo329/joshheat25/DSC03387.jpg

The spring was not only broken multiple times But it also was twisted
http://i388.photobucket.com/albums/oo329/joshheat25/DSC03388.jpg

One good thing was my seal looked to be in good condition no tears frays, etc
http://i388.photobucket.com/albums/oo329/joshheat25/DSC03389.jpg
http://i388.photobucket.com/albums/oo329/joshheat25/DSC03390.jpg

I never seen a spring broke in multiples like this. How it happens? Did you shoot even after no so natural sound/behavior shown by the gun?

I never seen a spring broke in multiples like this. How it happens? Did you shoot even after no so natural sound/behavior shown by the gun?

lmao glad you asked. I shot it prob only 2 times after I heard a weird noise, BUT the reason I stopped shooting was because my pellet was off the paper and I heard a crunching sound when I cocked the gun the 2nd time. then I shook the gun heard something rattle around and stopped. Luckily there was no damage to the compression chamber or anything else. inside. just the spring

I have a question for you guys. have any of you modified the transfer port when tuning? If so how much? and what specifically. I was reading and it was saying that you could expand the transfer port from the compression chamber. depending on the circumstances.

IMO, it's best to polish and perhaps chamfer, the compression side.

I was just reading an article on the pyramid air website. It says NOT to drill out the transfer port. but shows that on the compression side to do a stepped drilling for smoothness.

I'm a novice at this, and after searching and looking through the threads and the link on this one not working, I wonder if someone can point me in the direction of a similar thread or site where a newbie can get a step by step in breaking down a Phantom G1. I know I'll need to build a spring compressor, and the caution I'll need to use with that, but after taking the stock off of mine the other nite, I found some oil coming out of the compression chamber, and it's my understanding that oil in that area can cause dieseling.

As a newbie, I was looking for a step by step pictorial or video for takedown and I would like to do a general cleaning, deburring and lubing.

Thanks, if I overlooked something while searching I apologize, but there is a lot of general info out there.

Thanks again

odie

:welcome: to AG1 odie! This is the article that the link went to, I hope it helps. After you unzip it, it should open in your web browser when you double click it. If you have any trouble with the file, PM me and I'll try converting it to another format for you.

Thanks WestTexas Farmboy, that worked perfect. Gonna try and build a spring compressor this weekend, then I'm going to try to do a clean and deburr. I'll probably just do the obvious stuff for now, I don't think I'll mess with the tophat, guide, or smaller parts, but I am going to get the GRT-III trigger. Later on, after I feel more comfortable, I'll do a complete tune-up.

Thanks again!

odie

You are welcome odie, and that sounds like a good plan to me. FYI, the Sticky thread: "Requested: General Information" may have other resources that might help you.
http://www.airgunone.com/forums/showthread.php?t=3687 (http://www.airgunone.com/forums/showthread.php?t=3687)

And if you run into any problems, do not hesitate to post a help request! There are people here (I am not one of them) that have worked on just about every AG made since the Girandoni. (I am a history buff -- and probably one of the few human beings that even cares what the Girandoni Rifle was.) I have never seen anyone chided for their ignorance here -- and believe me, I have shown my ignorance consistently enough that if it were going to happen, it would have happened to me! In fact, the vast majority here just love to display how much they know ;) -- and in this case, that is a very good thing. :thumb:

And remember FarmBoy's First Axiom of AG1 Forum Posting:
"The only stupid question is one that should have been asked but was not even though the answer was unknown to the person who did not ask said question."

I found this usefull also. Helping a friend who took his apart, including the trigger group, and had a big bag of parts.

Also you mentioned the Girandoni. I had just looked at a youtube video the other day on it. Quite interesting history.
Here is the site if anyone wanted to watch.
http://www.youtube.com/watch?v=-pqFyKh-rUI&feature=player_embedded

Great link m&m, Thanks!!! And :welcome: to AirgunOne!! Hope to hear more from you in the future. :thumb:

Could not see ah, is not is come to night

I have been reading all of these threads and found some interesting info. I have the crosman g1 extreme and I have tried the dissassembly and all but when I get it back together it wont cock... I can feel the spring compressing but it wont lock... can someone please help?

Charles, Make sure the trigger sear is outside the comp tube.

Thank you for the response Splash! I think I know what your talking about and i think it is.

Remove the stock and look at the front of the trigger pack. The front of the sear should be sitting, on the outside. Unless you added preload to the spring, or diff guides, that's likely the culprit.

This is what it should look like, right?

That's where it's supposed to be. Did you add any washers on the rear guide?

I havent added anything, or done anything extra... any idea whats stopping it from locking?

Did you do anything to the trigger?
Try starting a new thread, listing everything that you've done. This is an old thread and might not get as much attention. You can PM me your # and I'll give you a call.

Thank you for the help!