Piston sleeve

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moulindu
Posts: 31
Joined: Wed May 20, 2015 6:22 am

Piston sleeve

Wed Jul 19, 2017 12:42 pm

Hi
Few days back I found my sub 12 fpe TX 200 MKIII making a lot noise during discharge with fair bit of recoil, though it has a tbt kit. Now reading some of the reviews of TXs from UK being so tamed & quiet thought of doing some modification. Got suggestion from a fellow member to insert a brass sleeve, as his friend’s TX was behaving similarly despite installing a tbt kit & after inserting a sleeve it got sorted.
I inserted a 45mm by 95mm brass sheet nicely polished & buffed with decent amount of moly coating. Now I could hear a scrapping sound while cocking with increased cocking effort, though velocity has increased by 20 fps from 766 to 786 with only 11fps spread for 10 shots, with reduced muzzle report & the best part was its sight picture retention.
Should I be worried about that scrapping noise, or shall I let it bed in?

Regards Moulindu

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Roadworthy
Posts: 26
Joined: Sun Feb 15, 2015 4:58 pm

Re: Piston sleeve

Thu Jul 20, 2017 5:05 am

I suspect the scraping is because the fit between the spring and the piston was already pretty close. The purpose of the tophat is to keep the spring centered in the piston. If the tolerance is too close on your brass sheet the scraping may continue indefinitely. It shouldn't hurt anything, though. Brass is much softer than steel.

I do suggest polishing both ends of the spring then putting a touch of lube on them. This helps reduce twang and torque.

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pedro.m.reis
Posts: 31
Joined: Thu Jul 20, 2017 4:02 pm

Re: Piston sleeve

Wed Jul 26, 2017 8:38 am

Sorry to hijack this, but can anyone point me to a site with an howho with pics for this "sleeve" thing?

Thanks
TX200 Mk3
HW50
Diana mod. 25 (being rebuild)

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eboswan
Site Admin
Posts: 2541
Joined: Sun Feb 15, 2015 9:16 am
Location: swansea

Re: Piston sleeve

Wed Jul 26, 2017 9:01 am

Not the best but this will give you the general idea, plenty of info on YouTube

https://www.youtube.com/watch?v=q4H3THAzhrA
IS MY SIGNATURE BIGGER THAN RAYS. Cz 452 american .22+sak mod
S200. .177

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TenMetrePeter
Posts: 583
Joined: Wed Jun 29, 2016 5:40 pm
Location: Luton Beds UK

Re: Piston sleeve

Wed Jul 26, 2017 10:42 am

Remember springs get slightly fatter on compression.
Luton, Bedfordshire
S400 MPR Precision 10m.
My Youtube

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pedro.m.reis
Posts: 31
Joined: Thu Jul 20, 2017 4:02 pm

Re: Piston sleeve

Wed Jul 26, 2017 5:59 pm

Thanks for the info!

Is there clearance to a sleeve using the original mainspring on a TX200?
TX200 Mk3
HW50
Diana mod. 25 (being rebuild)

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