SUPPORT OUR SPONSOR

Go Back   Club Cobra > Club Cobra Tech Areas > Shop Talk

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

MMG Superformance
Nevada Classics
Keith Craft Racing
Main Menu
Nevada Classics
Nevada Classics
MMG Superformance
MMG Superformance
Advertise at CC
Banner Ad Rates
Keith Craft Racing
Keith Craft Racing
August 2022
S M T W T F S
  1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31      
  #1 (permalink)  
Old 05-29-2006, 02:18 PM
lineslinger's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2004
Location: St. Louis, Mo.
Cobra Make, Engine: 427 S.O. Dual Quad / Cobra undecided
Posts: 1,380
Not Ranked     
Default %#@)*& air valve holder

I have been trying to pressurize (air) the cylinders on my engine so I can replace the inner springs on my valve train.
I tried to use the 14-18mm "flexible air valve holder" built by performance Tool co..
The problem is that once I get the the hose fitting threaded into the spark plug hole on the RPM Performer FE heads, there is no way to tighten the hose fitting enough so that it won't leak down pressure in a few seconds.
The insert fitting is too short to get a wrench on to snug it up once it's down in there and the spark plug inlet hole is too narrow to insert any type of tool to tighten the damn thing up.
Can anyone recommend an alternative tool, fitting, or an adaptor that is compatible with the narrow spark plug holes on these heads?

Mark
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 05-29-2006, 02:27 PM
392cobra's Avatar
6th Generation Texan
Visit my Photo Gallery

 
Join Date: Feb 2002
Location: Devil's Backbone,RR 32, TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
Not Ranked     
Default

I ran into this same problem once.

I remembered an old 'backyard' trick that worked like a charm.

I fed 1/4" poly rope down the hole and wrenched the engine over to push the rope to the top of the cylinder.

Worked with zero problems and went very quick.
Reply With Quote
  #3 (permalink)  
Old 05-29-2006, 02:38 PM
trularin's Avatar
Member of the north
Visit my Photo Gallery

 
Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,202
Not Ranked     
Default

I have four or five fittings for doing this. The trick for me was the large O'Ring that is around each one. I lube the O'ring with Parker Seal lube before pressurizing the cylinder.

The rope trick works okay for me as well.

Hope this helps.

Oh, yeah, my tool for presurizing the cylinders is made by Snap On.
Reply With Quote
  #4 (permalink)  
Old 05-29-2006, 03:01 PM
lineslinger's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2004
Location: St. Louis, Mo.
Cobra Make, Engine: 427 S.O. Dual Quad / Cobra undecided
Posts: 1,380
Not Ranked     
Default

I thought about filling the cylinder with something other than air, the poly rope doesn't leave any residual material in the chamber?
Tru...I am not familiar with Parker Seal Lube, similar to maybe pipe joint compound? Does the Snap On fitting "perform" well? (Or am I just in a tizzy and not reading straight )
Mark
Reply With Quote
  #5 (permalink)  
Old 05-29-2006, 07:20 PM
Rick Parker's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: California, Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
Not Ranked     
Default

I'm not sure I understand your dilema. Crank each cylinder in to TDC position either manually or with a remote starter button with an eye on the timing marks (90 degrees between cylinders in firing order). Set the parking brake, put trans in top (4th? gear). Insert the hose and leave it connected to the pressure source. Should work. Similar to doing a leakdown test. If you don't have one you should be able to find a hose with the adapters at an inexpensive price.
__________________
Rick

As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Reply With Quote
  #6 (permalink)  
Old 05-29-2006, 07:29 PM
cobred's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Nov 2003
Cobra Make, Engine: ERA #698 428 Toploader
Posts: 291
Not Ranked     
Default

Mark, tighten the hose by hand is enough. Are you trying to fill the cyl. and then removing the air supply? You have to leave the air connected untill each valve is done. Also. keep the trans. in neutral so the engine will turn each time you plug the air into the next cyl.
Reply With Quote
  #7 (permalink)  
Old 05-29-2006, 07:30 PM
lineslinger's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2004
Location: St. Louis, Mo.
Cobra Make, Engine: 427 S.O. Dual Quad / Cobra undecided
Posts: 1,380
Not Ranked     
Default

Rick,
The air presure is leaking out of the hole in the cylinder head where the spark plug is inserted/screwed in. I can't screw the air hose fitting down tight enough to get a good seal due to lack of room/space for a wrench to tighten it up, thus, air seepage.
Where do I look for adaptors, any clues?

Mark
Reply With Quote
  #8 (permalink)  
Old 05-29-2006, 08:54 PM
Rick Parker's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: California, Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
Not Ranked     
Default

I think you can find them on any of the tool trucks Such as Mac, Snap On, and others. NAPA Auto parts house should have them, maybe even Harbor Freight. Just be sure the adapter fitting to your air source is compatible, many of them look similar. Generally there is a rubber "O" ring at the spark plug hole. Be certain that the threaded part that screws into the head is no longer than the "reach" of your spark plugs. The reason for putting the vehicle in gear, and setting the parking brake is to prevent the crank from turning when the air pressure is applied. Keep the air pressure applied while working on the car. It will be normal to hear some minor leakage past the rings, which will be audible through the oil breather.
__________________
Rick

As you slide down the Banister of Life, may the splinters never be pointing the wrong way

Last edited by Rick Parker; 05-29-2006 at 09:00 PM..
Reply With Quote
Reply


Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 07:26 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy