Broken QB362 spring guide..

[kcurrie]

I had mentioned earlier that I was taking down and cleaning my QB36-2.  I forgot to mention that the spring guide is broken off the endcap and was loose inside the spring.  I have a B3 endcap/springguide which looks like it should fit, although it doesn't have the "lip" that the QB one had and is white rather than black.  I would prefer to keep the existing black endcap and somehow either replace the springguide itself or reattach it firmly to the endcap.. any suggestions?  With only minimal tools what could I make a spring guide out of if required?

[kcurrie]

So I made a spring guide (more on that later) and did a pretty good cleaning and lube job on the 36-2 but now after reassembling it it cocks ok but will not fire. I had quite an episode trying to get the piston back in there which required some minor trigger disassemble (basically taking the trigger itself out and holding the small spring in there up so I could slide the piston back in without catching on the whateveryoucallit. Anyway, now the gun is cocked and won't fire-- it appears the safety works, i.e. it still blocks the trigger pull and I can pull the trigger completely and the gun won't fire. Like a fool I started to take it apart while cocked then thought better of it as the spring is under extremely high pressure... start as I started to crank the spring back in it appeared that it didn't want to go any further in-- it's in far enough that I could stick a small screwdriver through the hole where the spring retaining pin goes... just after that the board my sping compressor is on cracked-- I guess because I was cranking it in and it simply wasn't going in any further... so now I sit, my gun cocked, spring under pressure with a failing spring compressor. It's in the garage below me, I left it for the night but surely have to deal with it tomorrow... any suggestions? I don't know if I should hope that it pops over night or not... I'm more than a little scared to go deal with it but I can't leave it there forever...

[shadow]

Is the guide you made the same length as the stock one and not interfering with the trigger component's. If you cocked it and the piston locked into the sear to hold it almost sound's like something in the trigger itself is not engaging the sear to release it from the piston. I would take a look the trigger area with the action out of the stock if possible and be safe since the airgun is loaded. If your pulling back the trigger with no resistance from the trigger itself it doesn't sound like it's engaging properly or at all. Also look closely at the spring guide area also near the trigger sear area, keep us posted on what you find and please be safe. Ed

[Plinkmaster]

Ok, the whateveryoucallit, is the sear, and that is probably stuck in the slot of the piston.When I took my piston out and in. I did not want to take the trigger apart at all, so I pushed the little  pin closest to the piston out with a paper clip and left the paper clip wire in, then I was able to take a real small screwdriver and pry the sear back enough to get the piston out.  You could probably do this also, to release the piston. I'd put on some safety glasses and give that a try.Be careful that sear might release anytime. maybe while your pushing the little pin out. then before you cock it again pull on the trigger and watch to see if its moving the sear.

[kcurrie]

I believe you are correct, it's the sear. The name escaped me at the time :-) See the whole story over on the "The Shop".

[steveiep]

Did you machine in that angled slot on the endblock that's near the base of the spring guide, that's what lets the sear ride up to engage & disengage.
if that slot isn't there, the sear gets jammed.
I know cos I broke the endblock & had a new unit machined out of graphited nylon.
The guy who made the new unit didn't machine out the slot for the sea r& things go jammed much like yours.
Had to put it in my spring compressor to take the spring out whilst still under full tension.
We've got a guy in the UK who crops the old guide off the endblock to leave a stub & then fits a proper circular delrin guide onto it as the OEM guide is rubbish.
The 36-2's coming into the UK also have a Urethane piston seal like the one in the kit in the link below (& those breach seals work too)
http://www.compasseco.com/tech-force-cleaningaccessory-tf97-p-1086.html

[kcurrie]

Ad, very interesting! I didn't know anything about this slot! It might be related, will have to take a closer look. As my spring guide broke what i did was make another one out of a plastic tube that I had that I filled with expanding foam and then put JB-weld on either end to seal it, and have a washer with a screw going into one end. I took the existing end cap and dremeled out an indention so the end of the screwhead would fit in there. So in theory I still have the slot as I'm using the original endcap, but will look once I get time to see if my issues were related.

Thanks for the info!

[steveiep]

No problem hope it helps.
Have a close look at the old end block & see how it compares with the new one.
It's important to replicate all the holes & grooves.
Also, for example, if you try & put a washer on the base of the spring guide, that's a bit too wide, that can interfere with the sear movement.
You will gather I've both experimented & had problems in the past. LOL
I put in a stainless steel spring, at Christmas, made by a bloke in South Wales, quite cheap but is a good fit & works well & came with it's own tophat.
Chinese made guns are starting to develop more of a following now in the UK & a few enterprising people are now able to supply delrin guides & tophats & ptfe seals & so on.
My B26 has delrin internals plus a JM piston seal but the spring is the key, a Titan XS made from Swedish chrome-vanadium spring steel & with a bonded PTFE coating. Not a cheap spring by any means, but what with the delrin internals it's smooth as anything & the spring will last & last.
I'm off to Cuba tomorrow for a bit of winter sun, so if you hear anyone hollering across the Caribbean at ya, you'll know it was me.  he he.
Regards from
The Eastern side of "the pond"

[shaft]

Compessaco Tech Force® Cleaning/Accessory Kit for TF97--- does that spring and piston seal work for a tf99 or is the spring too short

[steveiep]

The breach seals will work without question.
As to the spring, the quality isn't too good & probably too short for the power levels you guys favour in the US for a TF99.
The spring will fit but I don't think it's a good alternative.
As to the piston seal, depends where in the world you are.
In the UK we get them with the clipover Urethane seals like the one in the cleaning kit & for us it's a direct replacement (albeit I needed to remove a little material to make it a good fit.)
However, I'm hearing that the TF99's for the U.S. market have leather seals, so the furniture on the front of the piston may not be compatible.
Strip it & see what you got inside there, or someone more local to you might be able to offer more definitive advice... maybe Compasseco would know?

[renowntwo]

Compasseco sell the kit that you will need to replace the spring for the TF99 but you may want to call them first to see if the have it in stock. Archer Airgun sell the kit also but once again call or email them to see if it's in stock- there seems to be a short of this kit on hand- That's if you are going back with factory parts.

[renowntwo]

also given this Man a try, he has help me out.   http://WWW.home.comcast.net/~peterdragin/index.html/