TX200hc piston/seal

no avatar
UKD4N
Posts: 4
Joined: Sat Feb 20, 2016 10:29 pm

TX200hc piston/seal

Mon Mar 28, 2016 12:19 pm

I bought a second hand tx200hc a few months ago, when I stripped it appeared to have a V-Mach kit fitted, it was only running about 9.5ft/lb but was smooth so I went with it.
Then when I chrono'd it again the other night it had dropped to just under 8.5ft/lb, so I stripped it down again to investigate.
I took the piston seal off & I'm not sure what it is.
Attachments
IMG_20160328_131016.jpg
IMG_20160328_131016.jpg (141.25 KiB) Viewed 3432 times
IMG_20160328_131422.jpg
IMG_20160328_131422.jpg (213.24 KiB) Viewed 3432 times
IMG_20160328_131245.jpg
IMG_20160328_131245.jpg (162.76 KiB) Viewed 3432 times

no avatar
davyt63
Moderator
Posts: 188
Joined: Mon Feb 16, 2015 9:43 pm

Re: TX200hc piston/seal

Tue Mar 29, 2016 10:02 am

I haven't seen one like that before,it could be a shed tuner? DIY

Have you checked the piston seal for splits,hence the drop in power.
If no splits stick a preload washer over the guide rod and into the piston.

Regards

Davy
did i mention,i have done one less meet then Ray, lol.

no avatar
T 20
Posts: 32
Joined: Sun Feb 15, 2015 1:00 pm

Re: TX200hc piston/seal

Tue Mar 29, 2016 5:58 pm

That looks quite a professional conversion in order to fit a 25mm Weihrauch seal and shorten the stroke a little.




All the best Mick

no avatar
gary martin
Posts: 815
Joined: Thu Feb 19, 2015 8:21 pm

Re: TX200hc piston/seal

Tue Mar 29, 2016 9:01 pm

from the photos, it looks as if someone has turned the original piston down on a lathe, and then drilled/tapped the new seal dovetail on. the photos are a little close. the first one head on to the piston face appears to have a countersunk screw.

no avatar
FPoole
Posts: 339
Joined: Mon Feb 16, 2015 2:37 am

Re: TX200hc piston/seal

Sun Apr 03, 2016 2:18 am

Looks like a factory dovetail beneath that washer that holds on the HW style seal. Someone drilled and tapped the center of the latch rod to hold the washer on. Very simple way of doing this and the old style seal could still be used if the washer is removed and a screw put in the hole and cut off flush. Then again, everyone swears that the HW style seal is superior.

no avatar
UKD4N
Posts: 4
Joined: Sat Feb 20, 2016 10:29 pm

Re: TX200hc piston/seal

Sat Apr 09, 2016 6:32 pm

Update I have removed the screw and washer & filled the hole with Chemical Metal. Put an AA seal on & had 12.46 ft/lb, so collapsed a coil on the spring & added a pre-load washer & now have 10.83 ft/lb.

Post Reply

Who is online

Users browsing this forum: No registered users and 21 guests