Crosman Air Pistol Owners Forum

Crosman air pistol - General => Crosman air pistol - General discussion => Topic started by: Tater on June 21, 2014, 10:33:35 AM

Title: Recommendation of a flat top piston/valve install video/webpage
Post by: Tater on June 21, 2014, 10:33:35 AM
I've searched this site, but can't find a detailed walk-through of an install for a noob. I'm hoping to make my first installation attempt and was looking for a good video/webpage that shows it step by step along which lubes to use. Anyone know of a good one? I know I've seen them somewhere.
Title: Re: Recommendation of a flat top piston/valve install video/webpage
Post by: Baltim0re28 on June 21, 2014, 01:11:20 PM
This isn't a video but AC wrote this up last year when he got back into making/selling parts again. Hope this helps! It's actually alot easier than it seems. I was a little hesitant at first but jumped in and was surprised at how easy it was.

http://accustomparts.blogspot.com/2013/05/installing-flat-top-piston-and-valve.html?m=1 (http://accustomparts.blogspot.com/2013/05/installing-flat-top-piston-and-valve.html?m=1)
Title: Re: Recommendation of a flat top piston/valve install video/webpage
Post by: breakfastchef on June 21, 2014, 03:57:24 PM
Here is a good strip down video by crosshairs - [youtube]https://www.youtube.com/watch?v=aLSnFP1hSEU]https://www.youtube.com/watch?v=aLSnFP1hSEU[/url]

http://www.network54.com/Realm/CFTech/JTP1377.htm (http://www.network54.com/Realm/CFTech/JTP1377.htm)

I have used these instructions in the past  for setting up the adjustable piston. Instructions at the bottom of the page -

http://www.airgunsmith.com/cros1377/flattop_piston_install.htm (http://www.airgunsmith.com/cros1377/flattop_piston_install.htm)
Title: Re: Recommendation of a flat top piston/valve install video/webpage
Post by: Tater on June 21, 2014, 06:40:11 PM
Thanks guys! Those links are perfect and I have the Crosshairs video bookmarked (great video). I think I'll be able to do this but I don't have Mac 1 secret sauce. Is there an alternative I could use?
Also, I'm not sure about the "checking the alignment of the air port" in the A.C. blog but that will probably be easy to figure out once it's torn down.
Title: Re: Recommendation of a flat top piston/valve install video/webpage
Post by: breakfastchef on June 22, 2014, 12:18:14 AM
Automatic transmission fluid or 10-30W motor oil should be fine alternatives.

Aligning the exhaust port with the hole in the tube is easy. Put an allen key or drill bit in the exhaust port and rotate it so the port and hole in the tube are aligned. And, yes, this means the valve halves will not be tight.
Title: Re: Recommendation of a flat top piston/valve install video/webpage
Post by: Tater on June 22, 2014, 01:26:36 AM
Thanks again Larry, I just bought some 30 weight ND oil after losing my Pelgunoil. Not sure when I'll be able to do this now, going AG shooting/BBQing tomorrow with my wife at a GTA forum members house.