RC Jets Discuss RC jets in this forum plus rc turbines and ducted fan power systems

Ultra Precision air cylinders

Reply

Old 10-10-2018, 09:24 AM
  #1  
FenderBean
Thread Starter
 
FenderBean's Avatar
 
Join Date: Feb 2006
Location: Fort Hood Tx
Posts: 6,147
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Ultra Precision air cylinders

is there a way to remove the end? I have one that has blow by when the gear door is open. It’s been this way since I bought the cylinder but just found it, I thought it was leaking elsewhere but recently pulled the tomcat apart and found it.

Last edited by FenderBean; 10-10-2018 at 11:04 AM.
FenderBean is online now  
Reply With Quote
Old 10-10-2018, 11:57 AM
  #2  
Dave Wilshere
 
Join Date: Jun 2002
Location: Watford, UNITED KINGDOM
Posts: 10,201
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Contact John at MAP, he will sort you out. No you can’t remove it.

D
Dave Wilshere is online now  
Reply With Quote
Old 10-10-2018, 12:18 PM
  #3  
FenderBean
Thread Starter
 
FenderBean's Avatar
 
Join Date: Feb 2006
Location: Fort Hood Tx
Posts: 6,147
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Bummer
FenderBean is online now  
Reply With Quote
Old 10-10-2018, 04:53 PM
  #4  
two dogs
My Feedback: (12)
 
Join Date: Mar 2002
Location: St Petersburg, FL
Posts: 120
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

try bvm oil in cylinder
two dogs is offline  
Reply With Quote
Old 10-10-2018, 05:54 PM
  #5  
FenderBean
Thread Starter
 
FenderBean's Avatar
 
Join Date: Feb 2006
Location: Fort Hood Tx
Posts: 6,147
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

yeah I was gonna give that a whirl also, I contacted John, super fast response.
FenderBean is online now  
Reply With Quote
Old 10-11-2018, 03:17 AM
  #6  
JSF-TC
My Feedback: (2)
 
JSF-TC's Avatar
 
Join Date: May 2002
Location: Fort Worth, TX
Posts: 677
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Keith,

I had a similar issue with one of my Sierra custom retracts on my Hunter. I called Darrel and he said to not use BVM Super-Lube as it is too thin. He fills up each cylinder he makes with Dow Corning grease (as used by Ultra Precision) using a syringe and then forces it back out by pushing the piston back in by hand. Also rotate the piston multiple times to spread the grease around inside. Grease it from both sides.

I used a 3mL syringe and a short piece of 4mm fuel tube pushed over the end of the syringe. Don't need much grease. Start with the retract piston fully compressed and then pull out the piston to create a vacuum and at the same time push the grease in with the syringe.

Dow Corning Molykote 55 O-Ring grease also causes the rubber to swell slightly, helping achieve a good seal. Available on Amazon.

I tried it and it seems to work well. Cured the blow-by, at least for now.

Paul

Last edited by JSF-TC; 10-11-2018 at 05:19 AM.
JSF-TC is online now  
Reply With Quote
Old 10-11-2018, 09:08 AM
  #7  
FenderBean
Thread Starter
 
FenderBean's Avatar
 
Join Date: Feb 2006
Location: Fort Hood Tx
Posts: 6,147
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Thanks Paul, yeah I agree with the bvm stuff being a bit too thin. I have never had it actually work on an air cylinder but figure it couldn’t hurt. I would have to order the other stuff, John said he would replace it but I will definitely order some of the correct stuff for O rings to have for the future.
FenderBean is online now  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service