Fordmods Logo

over torquing head bolts(E-series 6's) 

 

Page 1 of 1 [ 8 posts ] 

 
 Post subject: over torquing head bolts(E-series 6's)
Posted: Thu Apr 09, 2015 3:49 am 
Parts Gopher
Offline
User avatar

Age: 25

Posts: 64

Joined: 11th May 2012

Ride: 94 tickford enhanced xg ute

Location: devonport
TAS, Australia

here is the deal. approximately 15mths ago i replaced the head gasket in my xg tickford ute. when i did it, i accidentally did the first bolt up 90° more than the written torque spec :oops: . i then decided to continue with the rest all with the extra 90°. to my suprise, it has actually lasted till just 2 days ago. i honestly expected it to blow ages ago considering i do alot of heavy towing and i absolutely love the limiter bash......i really love the limiter!!!!! :mrgreen: .

Has anyone else tried to over torque their head bolts? and if so, by how much and how long did it last? i am considering trying for 180° over but only if someone else has done it successfully. otherwise its 90° again :D
Top
 Profile  
 
 
 Post subject: Re: over torquing head bolts(E-series 6's)
Posted: Thu Apr 09, 2015 9:39 am 
Getting Side Ways
Offline
User avatar

Age: 54

Posts: 844

Joined: 12th Aug 2007

Gallery: 22 images

Ride: AU2 XR8 ute & 91 EA bitsa

Location: Melbourne
VIC, Australia

Ummm....you do realise that these bolts are designed to stretch and that the torque specs are determined by the manufacturers after testing them? Overtightening the head bolts can lead to them snapping off or stripping thread.

 

_________________

AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection

Top
 Profile  
 
 
 Post subject: Re: over torquing head bolts(E-series 6's)
Posted: Thu Apr 09, 2015 11:04 am 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 623

Joined: 24th May 2007

Gallery: 9 images

Ride: 97 TICKFORD XR6 Manaul

Location: Aldinga Beach
SA, Australia

there is 2 ways of doing the head bolts.
depending on which gasket specs your using.

EA-EL Graphite Gasket
Finger tighten the bolts,
then torque them to 40nm, t
hen turn 90 degrees.

AU MLS
Finger tighten,
torque to 30nm,
then turn 90 degrees,
then undo them,
tighten to 30nm ,
then turn 120 degrees.
Top
 Profile  
 
 
 Post subject: Re: over torquing head bolts(E-series 6's)
Posted: Thu Apr 09, 2015 3:34 pm 
Parts Gopher
Offline
User avatar

Age: 25

Posts: 64

Joined: 11th May 2012

Ride: 94 tickford enhanced xg ute

Location: devonport
TAS, Australia

yes i have done both types of gasket. this is for graphite atm. MLS will be going on my new engine when its built. i had no issue with undoing, stripping or snapping head bolts. has anyone actually done this before? even as an experiment?
Top
 Profile  
 
 
 Post subject: Re: over torquing head bolts(E-series 6's)
Posted: Fri Apr 10, 2015 9:47 am 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 623

Joined: 24th May 2007

Gallery: 9 images

Ride: 97 TICKFORD XR6 Manaul

Location: Aldinga Beach
SA, Australia

i don't think anyone has played games with head bolts for a good reason.

i is a pain in the a*** to redo,
(new gasket, bolts, time and should have the head at least check for squareness or machined)
specially when the recommended specs work quite well.

but in saying that if you do try it, keep some detailed info on what you did and how it went.
Top
 Profile  
 
 
 Post subject: Re: over torquing head bolts(E-series 6's)
Posted: Fri Apr 10, 2015 1:27 pm 
Moderator
Offline

Posts: 14513

Joined: 7th Nov 2004

Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

over tightening the head bolts cause them to stretch and loose the torque prematurely , that's probably why its failing now, a properly done head gasket should last in excess of 5 years. much much longer if you use the mls gasket..
Top
 Profile  
 
 
 Post subject: Re: over torquing head bolts(E-series 6's)
Posted: Fri Apr 10, 2015 11:28 pm 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

TROYMAN wrote:
over tightening the head bolts cause them to stretch and loose the torque prematurely , that's probably why its failing now, a properly done head gasket should last in excess of 5 years. much much longer if you use the mls gasket..


I replaced the head gasket on my ED back in 2008, using a std type composite head gasket.
I change the coolant every 2 years, Repco brand, and haven't had a problem.
I have 180-185 psi compression, dry test.

The problems I have seen with head gasket failure, is people don't change their coolant.....just like they don't change their brake fluid.

My 2 cents.

 

_________________

http://youtu.be/jJTh9F3Vgg0

Top
 Profile  
 
 
 Post subject: Re: over torquing head bolts(E-series 6's)
Posted: Fri Apr 10, 2015 11:40 pm 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

Have a look at the coolant tank....2008 and 2013 the pics were taken.........

 

 

Attachments:
IMGP0880_resize[1].JPG
IMGP0880_resize[1].JPG [ 161.41 KiB | Viewed 58 times ]
IMGP20874.JPG
IMGP20874.JPG [ 387.34 KiB | Viewed 55 times ]

 

_________________

http://youtu.be/jJTh9F3Vgg0

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 8 posts ] 

Who is online

Users browsing this forum: Google [Bot] and 31 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Sat Dec 16, 2017 2:39 pm All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names