XS-B18 I'm no expert and I'm a bit puzzled....

[texgunner]

There's a "bundle" of moly, heavy tar, and clear tar.  Everything you need to tune a springer and cheaper than buying each separately.  You'll have enough to do multiple tunes.

Blue

Thanks for the heads up on the lube kit.

[texgunner]

Well got the b18 apart this evening after making a redneck compressor and here is what I found, wish I had known that the 3 in 1 oil was gonna ruin the rifles piston seal, I had noticed a steady power loss with this gun for a long time but had no idea it was in such bad condition, I have new seal and spring on the way and I just went back to Jim's site and ordered some heavy tar and some super moly paste, im gonna do some serious polishing to the piston and other internal parts, chamber is very smooth with a mirror finish so Im gonna leave it along and just make sure that everything that goes in it is just as slick and smooth as it is.
Im thinking this rifle will be better than it ever was after Im done with it.

[Blue]

You're gonna be sooooo surprised when you get it back together!

If you haven't already, read Bob's springer tuning guide up in the library (or google CDT supertuning B-18).  It's got all the details on what to polish, how much to polish, and what to polish it with while you've got it apart.

I was absolutely shocked at the difference with the first rifle I tuned at home.

Blue

p.s. BIG thanks to everyone here at the GTA for all the time, money, and frustration you've all saved me.

[texgunner]

You're gonna be sooooo surprised when you get it back together!

If you haven't already, read Bob's springer tuning guide up in the library (or google CDT supertuning B-18).  It's got all the details on what to polish, how much to polish, and what to polish it with while you've got it apart.

I was absolutely shocked at the difference with the first rifle I tuned at home.

Blue

p.s. BIG thanks to everyone here at the GTA for all the time, money, and frustration you've all saved me.

Ditto......
 And I'll check out the tuning guide.

Thanks a lot to everyone and I'll continue to keep this thread updated on my results.

Shan

[texgunner]

here are some pix of the seal, piston and spring I took out of the B18, also a pic of the make shift compressor I threw together to get it apart.

Also the original spring is 36 Coils with a .118 wire size & .540 ID,  the New Tarantula Spring I ordered is 32 coils with a larger .128 wire size  & .513 ID, so it seems that the new spring will probably be stronger than the factory China spring, if the total length of the Tarantula Spring is shorter than the original spring I'm wondering if I should shim it out to make up for the length difference...?

I have got to get a Chrony so I will know for sure what is happening with the velocity, I'm really hoping to end up with an accurate rifle shooting somewhere between 800-900 FPS with 8 grain pellets.

I also would like to shorten the travel on this B18 Trigger if possible so if anyone that reads this has any advice or a known good mod with these triggers I'd sure appreciate the info on it.

Shan

[Paul68]

Multiply the wire diam of the old spring by the number of coils to determine full compressed height, then do the same for the new spring. That will show how much spacing will be needed if any. I'd do it but short on time.

[texgunner]

Multiply the wire diam of the old spring by the number of coils to determine full compressed height, then do the same for the new spring. That will show how much spacing will be needed if any. I'd do it but short on time.

Thank you sir,

Using this formula, old spring figure is 3.27 and new spring figure is 4.00, a difference of ( 0.073 )

I can make a spacer for this small amount easily.

Thank you very much for the information Paul

Shan

[avator]

Multiply the wire diam of the old spring by the number of coils to determine full compressed height, then do the same for the new spring. That will show how much spacing will be needed if any. I'd do it but short on time.

Thank you sir,

Using this formula, old spring figure is 3.27 and new spring figure is 4.00, a difference of ( 0.073 )

I can make a spacer for this small amount easily.


Thank you very much for the information Paul

Shan

I believe that's a difference of .73 not .073... huge difference

[texgunner]

Multiply the wire diam of the old spring by the number of coils to determine full compressed height, then do the same for the new spring. That will show how much spacing will be needed if any. I'd do it but short on time.

Thank you sir,

Using this formula, old spring figure is 3.27 and new spring figure is 4.00, a difference of ( 0.073 )

I can make a spacer for this small amount easily.


Thank you very much for the information Paul

Shan

I believe that's a difference of .73 not .073... huge difference

Yes that is correct almost 3/4" about 11/16"

I can build a spacer to make up for that difference no problem.

Shan

[texgunner]

Obviously this spring isn't the right one for this B18 rifle but im gonna try to make it work if I can.

[Paul68]

The old spring is 4.24 the new spring is 4.096

[texgunner]

The old spring is 4.24 the new spring is 4.096

Your right Paul....not sure how I messed up but I hit something wrong on the calculator, probably doesnt help that I work 12 long nights and was about half asleep when I did my figuring.....lol!

Thank you very much for that correction, so I would roughly only need to space the spring 3/16" to have it be the same length as original unless the old spring has weakened and is actually shorter than it was when new, im thinking I may make a .125" spacer washer and see how that works.

Thanks again to all who have helped me out on this, I really do appreciate it.

Shan

[IRONWORKER]

You sure got your moneys worth out of that old piston seal!

[2nd RCHA]

Sorry!, It's me again,,,If I can ask you a question or two,Did you encounter an automatic rear safety when you pulled the plastic rear cap off, that needs screws to be removed in order to take it out?,,,,I
m still lookin',,,Hopefully one day soon, I'll find the info I need, Cheer's, and Thank's, Andy.

[texgunner]

You sure got your moneys worth out of that old piston seal!

LOL.....! You know how us southern country folk are, we don't waist nothin, and we always ride that ole mule out for all she's worth.....!
yes sir, that seal came out in multiple pieces, and as the old saying goes "it's harder than dicks hat band" just deteriorated all to pieces, i dont know how that thing was even shooting as long as it was, I was out at the range shooting nickel size groups with that rifle about 3 weeks ago at 15 & 20 yds, I have been noticing a power loss with it but I didn't realize just how bad it actually was, I pulled out the Crosman TR77 today and fired it and now I can for sure notice just how badly that B18 was shooting, it would shoot the lighter wad cutter lead pellet supersonic when it was new and put them completely through a soft white wood 3/4" board unless it hit close to a knot or hard spot in the wood, I'm gonna be tickled to get this ole gal hitting hard again and hoping the accuracy will still be there with the tune job I plan to do and the new spring.

Shan

[texgunner]

Sorry!, It's me again,,,If I can ask you a question or two,Did you encounter an automatic rear safety when you pulled the plastic rear cap off, that needs screws to be removed in order to take it out?,,,,I
m still lookin',,,Hopefully one day soon, I'll find the info I need, Cheer's, and Thank's, Andy.

No sir, the XS-B18 doesn't have an automatic safety, the safety is a lever that just flips back and forth in front of the trigger just like on my Crosman TR77, it has that same type trigger and safety set up as the XS-B18 rifles, hope the image below heps you to see what the XS-B18 trigger I have looks like and hope you get your issues with the QB18 worked out soon, sorry I dont remember exactly what the troubles you're having are but I'm sure someone here will be able to lend a hand at some point, You may try emailing Mike Melick and just ask him about your issues or maybe just send the rifle to him and let him do the fix and tune it up real nice for ya if he has the stuff for that rifle.

Best wishes sir, Shan
http://images.nitrosell.com/product_images/13/3058/large-crosman-trigger-unit.jpg


I'm assuming that this is your gun here:


And this is your safety

[2nd RCHA]

 Yup, You got it,,,Any info, or experience with that variation?, Cheer's, Andy.



I'd love to send the gun to somebody, but finding a "tuner" up here is like looking for the proverbial needle, And sending it down to the states(worst case scenerio)could end up being confiscated by C Customs, There would need to be a lot of accompanying paper work all saying that its 500fps max, but who knows what pellet they would use to test, So, It doesn't seem worth it, going through all that crappolla anyways, I know the gun would come back shooting like a dream, Oh Well, I'll just have to keep my eyes peeled for anyone I can send it to. Cheer's, and Thank's for all of your help, and understanding, Andy.

[texgunner]

You're very welcome Andy, I wish I could help you out my friend, its a bad thing the government has messed things up so bad for y'all up there, we been fighting like h@ll to stop ours from doing the same to us........

Best wishes a keep me posted on any and all progress you have with it, pm me or just put the update right here on my thread and that will be just fine with me.

Shan

[Paul68]

The old spring is 4.24 the new spring is 4.096

Your right Paul....not sure how I messed up but I hit something wrong on the calculator, probably doesnt help that I work 12 long nights and was about half asleep when I did my figuring.....lol!

Thank you very much for that correction, so I would roughly only need to space the spring 3/16" to have it be the same length as original unless the old spring has weakened and is actually shorter than it was when new, im thinking I may make a .125" spacer washer and see how that works.

Thanks again to all who have helped me out on this, I really do appreciate it.

Shan

Not a problem, just trying to help ya avoid any headache if I see one comin.

[texgunner]

Thanks Paul, I always appreciate a good heads up when I've made a mistake or about to possibly make one.

I got the new Tarantula Spring & new Seal in the mail day before yesterday, the new spring is close to 1 1/2" longer than the original spring that came out of my rifle, and it is much stiffer than the original spring also, my old spring has an area about three inches long that is somewhat collapsed because the coils are way closer together than the coils are just a few inches down the spring, so I'm thinking that much of the difference in length between the two spring is due to the old one being partially collapsed in a 4" section of it.

I'm studying in my head on what I will due to fix another issue I found when I took the B18 apart, the small roller that is on that small pin on the cocking arm than rolls against the rifle stock when it is cocked was broken in two pieces and just fell out when I removed the action from the stock, not sure what I will do about that yet, but I know I can fix something up to replace it with a little engineering, sure wish I could just stick another new plastic roller on there and be done with it though...

Thanks again Paul

Shan

The old spring is 4.24 the new spring is 4.096

Your right Paul....not sure how I messed up but I hit something wrong on the calculator, probably doesnt help that I work 12 long nights and was about half asleep when I did my figuring.....lol!

Thank you very much for that correction, so I would roughly only need to space the spring 3/16" to have it be the same length as original unless the old spring has weakened and is actually shorter than it was when new, im thinking I may make a .125" spacer washer and see how that works.

Thanks again to all who have helped me out on this, I really do appreciate it.

Shan

Not a problem, just trying to help ya avoid any headache if I see one comin.