GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Support Equipment For PCP/HPA/CO2 => Topic started by: Robert 5mm on January 09, 2022, 05:47:11 PM
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I have watched a lot of videos but have not found the answer.
I an trying to rebuild a YH and what does the top slender piston have for rings.
Are there just the three single black ones or are there two smaller green ones under the top two black ?
For sure this is not an easy job.
Thanks, Robert
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Cant say but $20 for a ready to go piston looks worth it , drop it right in and go
http://zypcppump.com/product/original-yongheng-air-pump-piston/ (http://zypcppump.com/product/original-yongheng-air-pump-piston/)
(I dont know your model maybe a one for all part?)
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Cant say but $20 for a ready to go piston looks worth it , drop it right in and go
http://zypcppump.com/product/original-yongheng-air-pump-piston/ (http://zypcppump.com/product/original-yongheng-air-pump-piston/)
(I dont know your model maybe a one for all part?)
Reported as Dangerous Website to visit by Norton.
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Just bought a unit for $39 - but off of a trusted source.
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Just bought a unit for $39 - but off of a trusted source.
I just bought a bottom/top piston assembly off of eBay for $25. I will swap these out than I will perform a "ring swap" on the old one, understanding that I will most likely botch it up and ruin the second stage piston in the process.
https://www.ebay.com/itm/353826991504 (https://www.ebay.com/itm/353826991504)
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If yours is like mine... those seals are thick rings made of a plastic feeling material. You are able to find them in a 20 pack or something. Grabbed a bunch of spares when I originally bought my compressor.
Always have a few parts on hand to keep yourself up and running.
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If yours is like mine... those seals are thick rings made of a plastic feeling material. You are able to find them in a 20 pack or something. Grabbed a bunch of spares when I originally bought my compressor.
Always have a few parts on hand to keep yourself up and running.
Yupper, with green rings underneath them. The question is, how do you remove and then replace them? ???
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this was just posted a couple days ago and might be useful https://www.youtube.com/watch?v=mr19x8bSjag (https://www.youtube.com/watch?v=mr19x8bSjag)
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Cant say but $20 for a ready to go piston looks worth it , drop it right in and go
http://zypcppump.com/product/original-yongheng-air-pump-piston/ (http://zypcppump.com/product/original-yongheng-air-pump-piston/)
(I dont know your model maybe a one for all part?)
Reported as Dangerous Website to visit by Norton.
ya lol it know to report ots own home site as dangerous..lol
Good luck..
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If yours is like mine... those seals are thick rings made of a plastic feeling material. You are able to find them in a 20 pack or something. Grabbed a bunch of spares when I originally bought my compressor.
Always have a few parts on hand to keep yourself up and running.
Yupper, with green rings underneath them. The question is, how do you remove and then replace them? ???
He didn’t replace just the seals but it appears the top (the piece that broke on his) unscrews. My suspicion is that it is also high temp loctited, so I would put some heat on the lower portion while getting it to break loose. Just my speculation.
I have a couple of these and I’m sure I’ll be into one at some point down the road. This is good stuff to know.
Dave
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Mine does not have a screw on the top of the slender piston - just brass ( or some metal ) with 3 ring cuts - top two deeper.
The video does not show changing the rings - black, green or any.
I tried both green then black in top two grooves, then just black.
I tried heating in boiling water and got the black ones on - but not back in cylinder - that is why I bought one.
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It doesn’t show replacing the rings but he does show a shot of his partially unscrewed and he says the top unscrews to replace the rings but he is just going to replace the entire assembly.
Here is a screenshot from that video. So it doesn’t have a conventional looking screw on top but it screws together.
Dave
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I tried replacing the stage 2 seals on mine,
did not go well. The end cap was a bear to unscrew, should have used more heat on the loctite. Also should have chased the threads as I broke the threaded shaft when reassembling.
boiling water was not working well for me for reinstall of the seals and I gave up.
However I did a couple of the 2nd stage piston assemblies with seals installed and that worked fine.
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Just realized that mine is a Tuxing and not the yongheng..... im sorry
https://www.aliexpress.com/item/32799747786.html?spm=a2g0o.productlist.0.0.17568c36D3u39f&algo_pvid=b17d733c-8fb9-4111-bafa-1e3a0b6b690d&algo_exp_id=b17d733c-8fb9-4111-bafa-1e3a0b6b690d-3&pdp_ext_f=%7B%22sku_id%22%3A%2264035514376%22%7D&pdp_pi=-1%3B9.6%3B-1%3B-1%40salePrice%3BUSD%3Bsearch-mainSearch (https://www.aliexpress.com/item/32799747786.html?spm=a2g0o.productlist.0.0.17568c36D3u39f&algo_pvid=b17d733c-8fb9-4111-bafa-1e3a0b6b690d&algo_exp_id=b17d733c-8fb9-4111-bafa-1e3a0b6b690d-3&pdp_ext_f=%7B%22sku_id%22%3A%2264035514376%22%7D&pdp_pi=-1%3B9.6%3B-1%3B-1%40salePrice%3BUSD%3Bsearch-mainSearch)
These are the rings that are on my upper stage
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Just realized that mine is a Tuxing and not the yongheng..... im sorry
https://www.aliexpress.com/item/32799747786.html?spm=a2g0o.productlist.0.0.17568c36D3u39f&algo_pvid=b17d733c-8fb9-4111-bafa-1e3a0b6b690d&algo_exp_id=b17d733c-8fb9-4111-bafa-1e3a0b6b690d-3&pdp_ext_f=%7B%22sku_id%22%3A%2264035514376%22%7D&pdp_pi=-1%3B9.6%3B-1%3B-1%40salePrice%3BUSD%3Bsearch-mainSearch (https://www.aliexpress.com/item/32799747786.html?spm=a2g0o.productlist.0.0.17568c36D3u39f&algo_pvid=b17d733c-8fb9-4111-bafa-1e3a0b6b690d&algo_exp_id=b17d733c-8fb9-4111-bafa-1e3a0b6b690d-3&pdp_ext_f=%7B%22sku_id%22%3A%2264035514376%22%7D&pdp_pi=-1%3B9.6%3B-1%3B-1%40salePrice%3BUSD%3Bsearch-mainSearch)
These are the rings that are on my upper stage
Ya, looks like em. There's 2 kinds pfte or phenolic resin.
From what you read the phenolic resin type are the better.. i guess that falls under experience opinion.
Found a few suppliers but my links may be evil under norten...
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Just bought a unit for $39 - but off of a trusted source.
Will you please name your source?
(Assumes you are not a journalist)
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Trusted source was EBAY - They have been good to me.
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Cant say but $20 for a ready to go piston looks worth it , drop it right in and go
http://zypcppump.com/product/original-yongheng-air-pump-piston/ (http://zypcppump.com/product/original-yongheng-air-pump-piston/)
(I dont know your model maybe a one for all part?)
Reported as Dangerous Website to visit by Norton.
ya lol it know to report ots own home site as dangerous..lol
Good luck..
A Moron,
Do you misspell words on purpose to agitate people or is this some web short hand you speak in.
I do not mean to insult you - but you use very bad english in my opinion.
( I used to live in Jasper Alabama - so maybe I am a Northern Alabamian )
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How did you grip it to unscrew ?
I replaced rings the hard way without unscrewing, was a real pain and they ended up overstretching.
But the upside is they seal super now and my unit pumps real fast, at higher temp of course
but like twice as fast now.
I tried replacing the stage 2 seals on mine,
did not go well. The end cap was a bear to unscrew, should have used more heat on the loctite. Also should have chased the threads as I broke the threaded shaft when reassembling.
boiling water was not working well for me for reinstall of the seals and I gave up.
However I did a couple of the 2nd stage piston assemblies with seals installed and that worked fine.
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Following
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How did you grip it to unscrew ?
I replaced rings the hard way without unscrewing, was a real pain and they ended up overstretching.
But the upside is they seal super now and my unit pumps real fast, at higher temp of course
but like twice as fast now.
I tried replacing the stage 2 seals on mine,
did not go well. The end cap was a bear to unscrew, should have used more heat on the loctite. Also should have chased the threads as I broke the threaded shaft when reassembling.
boiling water was not working well for me for reinstall of the seals and I gave up.
However I did a couple of the 2nd stage piston assemblies with seals installed and that worked fine.
I wrapped it in aluminum tape iirc and used small channel locks. they were the only "pliers" I had that would budge it.
The loctite was fairly clear so I have no idea what it was. Knowing what I know now I would have heated it and cleaned the threads real well inside and out.
But considering the second stage piston is only $18 on Aliexpress I think that is the best option.
https://www.aliexpress.com/item/32934931476.html?spm=a2g0o.order_list.0.0.187518021rvTiF (https://www.aliexpress.com/item/32934931476.html?spm=a2g0o.order_list.0.0.187518021rvTiF)
There is also this:
https://www.aliexpress.com/item/1005001842191188.html?spm=a2g0o.order_list.0.0.187518021rvTiF (https://www.aliexpress.com/item/1005001842191188.html?spm=a2g0o.order_list.0.0.187518021rvTiF)
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For tasks like this, I generally use a couple of scrap pieces of aluminum. Clamp together and drill through the middle. This cuts half diameter in each piece. Use a bit slightly smaller than od of piece you want to grab. Then clamp piece in. If you need added grip, a little grinding compound helps.
Keep a fair amount of tension while heating so you can tell when it breaks loose. In the case of brass, it can twist off easily so just try to put enough tension that is reasonable for the size/material.
Dave
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For tasks like this, I generally use a couple of scrap pieces of aluminum. Clamp together and drill through the middle. This cuts half diameter in each piece. Use a bit slightly smaller than od of piece you want to grab. Then clamp piece in. If you need added grip, a little grinding compound helps.
Keep a fair amount of tension while heating so you can tell when it breaks loose. In the case of brass, it can twist off easily so just try to put enough tension that is reasonable for the size/material.
Dave
That approach sounds really good Dave, although I would not want to get grinding compound anywhere near this assembly for fear of it embedding.
There is actually a product made for screwdriver bits slipping in screw heads. It is a metal looking grit(pretty course) suspended in a somewhat thick liquid which can be dripped into the screw head. Again not for this assembly.
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Proper cleanup is a necessity. Keep in mind, millions of assemblies throughout all industries have some type of abrasive used in the manufacturing process. Say nay if you will, but a proper cleanup is all that is needed.
Dave
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OK, I would have thought that it would have embedded in the brass.
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Cant say but $20 for a ready to go piston looks worth it , drop it right in and go
http://zypcppump.com/product/original-yongheng-air-pump-piston/ (http://zypcppump.com/product/original-yongheng-air-pump-piston/)
(I dont know your model maybe a one for all part?)
Reported as Dangerous Website to visit by Norton.
ya lol it know to report ots own home site as dangerous..lol
Good luck..
A Moron,
Do you misspell words on purpose to agitate people or is this some web short hand you speak in.
I do not mean to insult you - but you use very bad english in my opinion.
( I used to live in Jasper Alabama - so maybe I am a Northern Alabamian )
Purdy sure it's his schtick. This'n here forum aint about spelling and grammar.
You do you, boo.
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Are you saying the brass slender piston unscrews at each ring cut ?
Mine sure looks like one solid piece.
The rings sure would be a whole lot easier to install - but the piston may get destroyed.
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Are you saying the brass slender piston unscrews at each ring cut ?
Mine sure looks like one solid piece.
The rings sure would be a whole lot easier to install - but the piston may get destroyed.
No there is just one joint. The first and third ring still need to be heated and worked over the brass.
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Are we certain that the brass between rings is not just a loctited ring?
Dave
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Looks like that hunk that broke off hammered the dog snot out of the remaining top of that piston. No telling what it looked like before.
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I wonder if the top piece runs slack and lengthens the piston, if the piston will hit the top of the cylinder.