Club Cobra Gas-N Exhaust  

Go Back   Club Cobra > Engine Building, Tuning, and Induction > Small Block Talk

Nevada Classics
MMG Superformance
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
MMG Superformance
MMG Superformance
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
Keith Craft Racing
March 2024
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 02-25-2003, 01:08 PM
wilf leek's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Leicester, UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
Not Ranked     
Question Weird cyl-head water leak

Ok small block gurus, lend me a hand.

I have noticed a water leak from my 351w stroker with edel Vic jr ally heads. I finally tracked it down to the head/block joint, just above the oil filter. The pic below shows where it is coming from. 8000 miles on the motor.

here are the symptoms:

1/ No overheating or cooling system pressurisation
2/ No water in the oil
3/ definitely not running downwards from the inlet manifold sealing area
4/ only get about 10 drips from it as it cools
and is nearly cold after a run - doesn't leak when hot or stone cold.
5/ no biggy - water level staying relatively stable
6/ engine has never been overheated, but gets regularly thrashed

So - my guess is that it is coming from the head gasket - probably the forward connecting passage betwen the block and the head.

I have some options:

1/ it ain't broke enough to warrant fixing it
2/ it should get a new head gasket and check head for warping.
3/ dump some coolant system sealer stuff in there and pray.

what do you reckon?

PS - leak/leek - I heard it already.
Attached Images
 
__________________
Wilf

Last edited by wilf leek; 02-25-2003 at 01:11 PM..
Reply With Quote
  #2 (permalink)  
Old 02-25-2003, 01:15 PM
HighPlainsDrifter's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jul 2000
Location: Chilliwack,BC, BC
Cobra Make, Engine: F5 Roadster
Posts: 1,409
Not Ranked     
Lightbulb

Hi,
There is a possible leak from the lower[short] head bolts as they go into the water passage. Did you put sealer on them as the heads were put on? You could try draining the rad and taking out the lower bolts and putting thread sealer on them and re-torquing them.
Good Luck,
Perry.
Reply With Quote
  #3 (permalink)  
Old 02-25-2003, 02:08 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 would vote for #3.

Rick
__________________
Rick

As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Reply With Quote
  #4 (permalink)  
Old 02-26-2003, 10:30 AM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2002
Location: Redlands, Ca.,
Posts: 77
Not Ranked     
Talking New head gasket

Wilf,
I know you like things right and orderly. Pull the head, check it for flatness and then do what is necessary to fix it properly. Even if the head is flat you need to change the gasket. If the head proves to be warped I would pull both heads and make the necessary corrections.
Just my 2 cents. Summer is just around the corner.

Good luck,

Harris
Reply With Quote
  #5 (permalink)  
Old 02-26-2003, 11:28 AM
Ron61's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Dec 2001
Location: Shasta Lake, CA
Cobra Make, Engine:
Posts: 26,552
Not Ranked     
Post

Wilf,

Just a suggestion as I am sure you have already checked this. I fought the very same type leak for a year and finally in desperation I got my torque wrench out and checked the head bolts along with all others. I found several that had backed off as much as a pound. I retorqued all of them and that was about 2 years ago and I have never had a drop of water leak since. However I now go over the car on a regular basis and check the bolts to see that they are staying tight.

Ron
__________________
Ron 61
Ronnie Widener


View my Miscellaneous Gallery
Reply With Quote
  #6 (permalink)  
Old 02-26-2003, 12:20 PM
wilf leek's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Leicester, UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
Not Ranked     
Default

Thank you for your replies guys, there seem to be some options that are easier to do than others, so I guess they will get tried first.

Harris - yes, nice and orderly is the english way!! LOL

However, I have recently fallen under the bad influence of some colonial types, reckon I must be getting lazy. Or old, or both.
I can see that head coming off in the near future tho'.
__________________
Wilf
Reply With Quote
  #7 (permalink)  
Old 02-26-2003, 02:16 PM
bmalone's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2001
Location: San Diego, CA
Cobra Make, Engine:
Posts: 1,112
Not Ranked     
Default

Don't forget grammar and spelling correction.
__________________
Bill Malone
Gashole
CSX4786
Reply With Quote
  #8 (permalink)  
Old 02-26-2003, 02:55 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2002
Location: Redlands, Ca.,
Posts: 77
Not Ranked     
Thumbs up

Wilf,
I forgot to ask you in my previous post. Are you guys still doing "floggings" at the Tower of London? My wife and I are coming to England this year and having her watch a flogging would straighten the old gal out.

Keep your heads tight!

Harris
Reply With Quote
  #9 (permalink)  
Old 02-27-2003, 03:45 AM
wilf leek's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Leicester, UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
Not Ranked     
Default

Harris - sorry, the only floggings still happening take place behind closed doors for ex public-school members of the House of Lords.

Public attendance strictly frowned upon - we english like to keep our perversions private!

Of course - you could always take the lady to Saudi Arabia, no shortage of public flogging there.
__________________
Wilf
Reply With Quote
  #10 (permalink)  
Old 02-27-2003, 07:04 AM
hound dog's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2001
Location: randleman, NC,
Posts: 407
Not Ranked     
Default

Wilf,
Had the same problem with my 351/victor jr. setup but it happened earlier, actually first time I ran the engine. Problem was the head bolt torque wasn't high enough. It seems that I had too many values, Edelbrocks numbers, ARP's numbers, and Ford's numbers not to mention dry vs. lubricated. I think I initially used ARP's numbers for lubricated threads and had to add another 5 ft/lbs to get the water jackets to seal. I ran the motor for a while (couple of hours) and then went back and retorqued all the head bolts. Added 5 more ft/lbs to be sure and haven't had any more water leaks. If I think of it I'll check the final numbers tonight when I get home and repost.
h dog
Reply With Quote
  #11 (permalink)  
Old 02-27-2003, 08:11 AM
coosawjack's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2002
Location: Beaufort, SC
Cobra Make, Engine: Classic Roadsters '66 427 Replica-SOLD
Posts: 299
Not Ranked     
Default

Hey Guys....

If you "re-torque" heads do you just check tightness or do you loosen them one at a time and re-tighten to whatever torque spec you are wanting???

Thanks,
Jack
Reply With Quote
  #12 (permalink)  
Old 02-27-2003, 08:28 AM
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2003
Location: Jacksonville Florida,
Posts: 82
Not Ranked     
Default

Jack,
You must back off the bolt 4 or 5 pounds and then come back up to final torque without stopping along the way. Breakaway torque is always higher than the "sliding surface" torque value, so just checking the current torque won't tell you anything.
Reply With Quote
  #13 (permalink)  
Old 02-27-2003, 09:14 AM
wilf leek's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Leicester, UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
Not Ranked     
Default

Umm, just a thought guys, are we sure that any of the head bolts enter the water jacket on a 351W? I know they do on a 302, but I am not sure about a 351.

I am also torqueing to 105lbs ft on the short bolts, 115 on the long. Sound right?
__________________
Wilf
Reply With Quote
  #14 (permalink)  
Old 02-27-2003, 11:46 AM
Roscoe's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2000
Location: Fairfield, NJ, USA, NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
Send a message via ICQ to Roscoe
Not Ranked     
Default

Wilf,
The lower outside bolts go into the water jacket.
Roscoe
__________________
Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
Reply With Quote
  #15 (permalink)  
Old 02-27-2003, 01:23 PM
wilf leek's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Leicester, UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
Not Ranked     
Default

Thanks Roscoe - I couldn't remember for the life of me.
__________________
Wilf
Reply With Quote
  #16 (permalink)  
Old 02-27-2003, 01:59 PM
CC Member
Visit my Photo Gallery

 
Join Date: Nov 2002
Location: North Florida, USA
Cobra Make, Engine: FFR4067, 393W
Posts: 95
Not Ranked     
Default

I'm building a 393. I've run a tap down every headbolt hole and looked in each one with a light. The holes are all blind, none go into the waterjacket.
My block is a 351 D9AE (1979).

I torque all my ARP bolts at 105.

Ed
__________________
We used to own the government, now the government owns us. Where'd we go wrong?
Reply With Quote
  #17 (permalink)  
Old 02-27-2003, 02:42 PM
CC Member
Visit my Photo Gallery

 
Join Date: Oct 2000
Location: Crystal Lake, IL
Cobra Make, Engine: Everett-Morrison, 434 cid
Posts: 977
Not Ranked     
Default

Wilf,
It is a common practice, at least among circle track engine builders to put a thin layer of clear silicone around all the coolant passages on both the deck and the head. They also put it around the studs and under the washers, even on blind holes since the coolant could migrate across the deck from the passages to the studs. This used to be something the Sprint Car and Late Model engine builders would do on their aluminum motors since aluminum moves so much during warm up and cool down, but now they’re doing it on iron block/alum head motors too. Actually the only gasket they don’t use silicone on is the carb.
Scott
Reply With Quote
  #18 (permalink)  
Old 02-27-2003, 08:16 PM
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2001
Location: Levittown,NY USA,
Posts: 201
Not Ranked     
Default

Wilf,
Did you make your alt. braket or buy it aftermarket. I have not been able to find one for my 351. After you get your water leak problem fixed could you take a close up of your alt. bracket.

TomS.
__________________
Chics LI
Reply With Quote
  #19 (permalink)  
Old 02-27-2003, 10:35 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2002
Location: fairbanks,Alaska,
Posts: 85
Not Ranked     
Default

Wilf,
I have the exact same problem with my big block. Slightly different location but the symptoms are identical. Does not overheat or leak when warm and running, only leaks after completely cool, not mixing with oil or combustion chamber etc. If you find a simple solution- post it. My problem is having enough clearance in the engine compartment to remove the head.
Reply With Quote
  #20 (permalink)  
Old 02-28-2003, 01:36 AM
wilf leek's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Leicester, UK
Cobra Make, Engine: Crendon, windsor 408 stroker, tremec. Also GSX008
Posts: 1,406
Not Ranked     
Default

TomS - alternator bracket came from my engoine builder, will ask him for the source.

Plan now is:

stage 1: retorque all head bolts

if no cure:

stage 2: remove the 2 short bolts from around the affected area and refit with more sealant. Not doing this at stage one since I feel that completely removing any single bolt whilst the others are tight is intrinsically "bad" from a strict engineering viewpoint.

if no cure:

stage 3: pull head, check for straightness, replace cyl head gasket and use some luvverly silicon sealant.

Any particular grade of silicon I should be using? I have also heard that header gaskets seal better with that stuff.
__________________
Wilf

Last edited by wilf leek; 02-28-2003 at 01:38 AM..
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 02:48 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, 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
Links monetized by VigLink