Keith Craft Inc.- We service what we sell!!! Check out our Cobra engines!!! We build high performance racing engines and components for the fast pace strip racing industry as well as daily drivers who want to be FIRST!!!

FE Forums sponsored by Keith Craft Inc.


Welcome to Club Cobra.

You are currently viewing the world's largest resource for Shelby related information as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!


Go Back   Club Cobra > Engine Building, Tuning, and Induction > FE 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
Keith Craft Racing
MMG Superformance
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
April 2019
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        

Kirkham Motorsports

Like Tree2Likes

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 10-12-2015, 02:37 PM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default Shelby Block Rear Main Seal Leak

I have a new Shelby 468 and after only 18 miles running, it is leaking a fair amount of oil at the rear main cap.

The oil appears to be leaking at the oil pan gasket exactly where the gasket passes over the main cap / block joint on both sides. I'm using an Aviad oil pan + windage tray.

I've found some threads on CC and also FE forum explaining problems with early Shelby blocks leaking due to insufficient drain hole size in the rear main cap and explanation how to modify the main cap & oil pan to solve the problem. However, the photos seem to have been removed from the threads so I can't see the before & after countermeasures.

Can anyone help with the following:
1) Pictures of how the Shelby rear main bearing cap oil leak it countermeasured
2) Has anyone tried to remove an Aviad oil pan from an FE mounted in a Kirkham? Can it be done?

Oh, before anyone chimes in with the leak is probably coming from somewhere else an find it's way to the rear.......It isn't. I've checked ALL the usual FE leak spots and then some. The motor is dry except for the rear main seal area.

Many thanks
Stuart
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 10-12-2015, 04:26 PM
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Posts: 136
Not Ranked     
Default

Try here

FE Technical Forum
Reply With Quote
  #3 (permalink)  
Old 10-13-2015, 04:39 AM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default

Brooklyn-427,

Thanks for the link, I'll try seaching through that later tonight.

Anyone else got some more direct info. / experience with Shelby FE blocks?
Reply With Quote
  #4 (permalink)  
Old 10-13-2015, 10:52 AM
CC Member
Visit my Photo Gallery

 
Join Date: Oct 2013
Location: Columbus, OH
Cobra Make, Engine: ERA 714
Posts: 705
Not Ranked     
Default

I have Block 597 and have a similar leak. I have managed to slow it considerably by taking some RTV to the rear of the pan where it mounts up to the block. I am not sure that the repair is worth going after trying to fix it unless you can be 100% sure it will be fixed. I also run the Aviad oil pan. I think the rear of the intake seal also leaks and drains down the blockplate and drips. It may be worth using the dyes to verify that it is alll coming from that location.

Phil
Reply With Quote
  #5 (permalink)  
Old 10-13-2015, 11:15 AM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default

Thanks Phil,
My block is CSX472 so earlier than yours and should have the improved drain in the rear main cap. Do you know if your main cap was the improved version from Shelby? I've also thought about applying some RTV between the pan & block plate, but that does feel like a temporary sticking plaster over the root cause. You are right though, I could spend a lot of time & effort removing the engine and trying to re-seal that area only to find it's no better. I have checked everywhere else and I'm pretty sure it's the rear seal. Life's a b*tch sometimes!
Stuart
Reply With Quote
  #6 (permalink)  
Old 10-13-2015, 12:04 PM
Bernica's Avatar
Senior CC Premier Member
Visit my Photo Gallery
Lifetime Contributor
 
Join Date: Nov 2004
Location: SoCal, CA
Cobra Make, Engine: CSX #4250 with CSX #197 482; David Kee Toploader
Posts: 3,567
Not Ranked     
Default

I have Shelby block #197 and the Aviad pan too.

Thanks to this site, I am a firm believer in the Motorcraft TA-31 RTV sealant (amazing nasty stuff!) and I always keep a pair of Milodon #40450 pan gaskets hanging on the wall just in case. I have yet to have to use them.

As far as removing an Aviad pan in the car, I seem to remember the Kirkham's posting some advice on that subject a long time ago. Might do another search or give them a call.

All that said, I have minimal problems with rear leak. Knocking on wood!
__________________
All that's stopping you now Son, is blind-raging fear.......
Reply With Quote
  #7 (permalink)  
Old 10-13-2015, 12:46 PM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default

Thanks Bernica,

If I can't find the thread, I might e-mail David to confirm an easy way of removing the oil pan without removing the engine.
Reply With Quote
  #8 (permalink)  
Old 10-13-2015, 12:51 PM
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Posts: 136
Not Ranked     
Default

just a thought.. i read in another thread about a aviaid oil pan that was fitted using bolts rather than studs, the result was the bolts were a tad too long and had not clamped the pan down onto the gasket enough, thus causing a leak because the bolts were a fraction too long. They swapped out to the correct studs and corrected the problem. Worth looking too see if you have bolts or studs.
Reply With Quote
  #9 (permalink)  
Old 10-13-2015, 02:50 PM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default

Brooklyn-427,
Thanks for the thought, but I have studs & nuts. I also checked tightness because I know the gaskets can relax a little from new. However, all nuts seemed snug. I guess I've been unlucky with this engine. Don't whether to try and bodge it with RTV as Large Arbor suggests and then live with it until I need to pull the engine again, or bite the bullet now after only 18 miles of running and pull the engine and try an re-seal the rear main cap seals.........sooooooo frustrating! I finally got to experience 600hp in a lightweight Kirkham and was blown away by the acceleration. All I want to do is drive the thing and enjoy it.........not blow oil out of the back of the engine!
Reply With Quote
  #10 (permalink)  
Old 10-13-2015, 03:36 PM
Bernica's Avatar
Senior CC Premier Member
Visit my Photo Gallery
Lifetime Contributor
 
Join Date: Nov 2004
Location: SoCal, CA
Cobra Make, Engine: CSX #4250 with CSX #197 482; David Kee Toploader
Posts: 3,567
Not Ranked     
Default

Do you also have a windage tray installed?
__________________
All that's stopping you now Son, is blind-raging fear.......
Reply With Quote
  #11 (permalink)  
Old 10-13-2015, 04:01 PM
CC Member
Visit my Photo Gallery

 
Join Date: May 2015
Posts: 376
Not Ranked     
Default

Hey since talk is cheap, my oil problems were related to an engine builder improperly calibrating the oil dip stick...The full line was about 50% beyond the capacity of the pan manufacturer's figure. When i filled mine to the oil pan mfg's figure my dipstick didn't register anything.

Could it be that you simply have too much oil in the engine? Filling it clear up to the seal?

Just a thought.
__________________
Superformance 1764
Ford Racing 427 SB
Reply With Quote
  #12 (permalink)  
Old 10-13-2015, 04:48 PM
rodneym's Avatar
Full Blown Member
Visit my Photo Gallery
Gold Star Contributor
 
Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton FE
Posts: 2,506
Not Ranked     
Default

Not likely, tortuga. FE's leak before they're assembled

I don't mind the leak in itself, it's the mess it makes on the chassis.
That's why I'm in the process of experimenting with diapers (New Pig strips with Gorilla tape at the bottom of the bellhousing and between the block and blockplate). Normally I wouldn't think of such a cockamamie scheme but I have so much access now that I have a Kwik Lift...
...I can see every pinhead sized drop, with my own pinhead eyes
__________________
rodneym
Reply With Quote
  #13 (permalink)  
Old 10-13-2015, 05:55 PM
Bernica's Avatar
Senior CC Premier Member
Visit my Photo Gallery
Lifetime Contributor
 
Join Date: Nov 2004
Location: SoCal, CA
Cobra Make, Engine: CSX #4250 with CSX #197 482; David Kee Toploader
Posts: 3,567
Not Ranked     
Default

Quote:
Originally Posted by rodneym View Post
Not likely, tortuga. FE's leak before they're assembled

I don't mind the leak in itself, it's the mess it makes on the chassis.
That's why I'm in the process of experimenting with diapers (New Pig strips with Gorilla tape at the bottom of the bellhousing and between the block and blockplate). Normally I wouldn't think of such a cockamamie scheme but I have so much access now that I have a Kwik Lift...
...I can see every pinhead sized drop, with my own pinhead eyes
Like my old Jags...
If I don't see oil on the floor, then something is wrong!
__________________
All that's stopping you now Son, is blind-raging fear.......
Reply With Quote
  #14 (permalink)  
Old 10-14-2015, 04:47 AM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default

Bernica,
Yes I have a windage tray installed, it cam with the Avaid oil pan.
Tortuga,
I have calibrated the dipstick according to Avaid's procedure - put 9 qrts in from empty - mark dipstick 'Full' - start engine and run until primed, then stop & allow oil in pan to settle - Mark dipstick 'Low' - top up with oil to the full mark. It might be worth reducing oil volume to 8 qrts and see if the leak diminishes?

General question for everyone: Do you run 8 or 9 qrts with an FE Avaid pan?
Reply With Quote
  #15 (permalink)  
Old 10-14-2015, 07:36 AM
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Posts: 136
Not Ranked     
Default

Stuart

How do you find the CR toploader with the 3.07?
Reply With Quote
  #16 (permalink)  
Old 10-14-2015, 09:53 AM
CC Member
Visit my Photo Gallery

 
Join Date: Oct 2013
Location: Columbus, OH
Cobra Make, Engine: ERA 714
Posts: 705
Not Ranked     
Default

I run 9 quarts when I run which for past month has not been any due to starter alignment issues. Going after that issue this weekend.

Phil
Reply With Quote
  #17 (permalink)  
Old 10-14-2015, 10:05 AM
Bernica's Avatar
Senior CC Premier Member
Visit my Photo Gallery
Lifetime Contributor
 
Join Date: Nov 2004
Location: SoCal, CA
Cobra Make, Engine: CSX #4250 with CSX #197 482; David Kee Toploader
Posts: 3,567
Not Ranked     
Default

I am at 11 quarts with the Aviad and an oil cooler. I always buys a case and have one left.
__________________
All that's stopping you now Son, is blind-raging fear.......
Reply With Quote
  #18 (permalink)  
Old 10-14-2015, 02:57 PM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default

Quote:
Originally Posted by Brooklyn-427 View Post
Stuart

How do you find the CR toploader with the 3.07?
CR Toploader is fine with a 3.07 rear end. 1st gear is fairly tall but manageable in traffic, motorway cruise at 80mph around 3,000rpm. Acceleration between gears is pretty rapid. I don't like 5 speed gearboxes in a Cobra.
Dominik likes this.
Reply With Quote
  #19 (permalink)  
Old 10-14-2015, 03:01 PM
A98Coupe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2008
Location: Cleveland, UK
Cobra Make, Engine: #535 Kirkham 427, 427 Side Oiler
Posts: 157
Not Ranked     
Default

Quote:
Originally Posted by Large Arbor View Post
I run 9 quarts when I run which for past month has not been any due to starter alignment issues. Going after that issue this weekend.

Phil
Thanks Phil,
Looks like I'm not overfilling anyway.
Reply With Quote
  #20 (permalink)  
Old 10-14-2015, 04:13 PM
Bernica's Avatar
Senior CC Premier Member
Visit my Photo Gallery
Lifetime Contributor
 
Join Date: Nov 2004
Location: SoCal, CA
Cobra Make, Engine: CSX #4250 with CSX #197 482; David Kee Toploader
Posts: 3,567
Not Ranked     
Default

Quote:
Originally Posted by A98Coupe View Post
CR Toploader is fine with a 3.07 rear end. 1st gear is fairly tall but manageable in traffic, motorway cruise at 80mph around 3,000rpm. Acceleration between gears is pretty rapid. I don't like 5 speed gearboxes in a Cobra.
I run 3:31 with a WR and like the setup. Yes, I'm not a fan of 5 or 6 speeds either!
Dominik likes this.
__________________
All that's stopping you now Son, is blind-raging fear.......
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 03:47 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2019, 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