SBC headbolt removal question - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-09-2008, 04:28 PM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
SBC headbolt removal question

When removing headbolts, should I loosen in stages or is it acceptable to loosen each bolt all the way, providing the correct sequence is followed? I know that, when tightening, the bolts should be torqued in stages until the final torque value is attained, but I just wondered if the same should apply when loosening the bolts in order to lift the heads.

Thanks,
Ian.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-09-2008, 04:33 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 60 Times in 57 Posts
It don`t matter how they come out.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-09-2008, 04:35 PM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by DoubleVision
It don`t matter how they come out.
Great, thanks. Does it even matter regarding the sequence, or can bolts be removed at random?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-09-2008, 05:03 PM
Member
 
Last wiki edit: Ford axle ratio codes
Last journal entry: Rear Suspension
Last photo:
Join Date: Aug 2005
Location: Prattsville
Posts: 6,415
Wiki Edits: 31

Thanks: 2
Thanked 61 Times in 57 Posts
Quote:
Originally Posted by v8hed
Great, thanks. Does it even matter regarding the sequence, or can bolts be removed at random?
I have always removed from the outside in, reverse sequence, but that's just me
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-09-2008, 06:21 PM
Barry.M's Avatar
Old Phart
 
Last wiki edit: How to identify a Ford V8
Last journal entry: 27 T Roadster project: Underway cont.
Last photo:
Join Date: Apr 2002
Location: S.A.Australia
Age: 55
Posts: 132
Wiki Edits: 3

Thanks: 0
Thanked 0 Times in 0 Posts
With a motor that has unknown history (to me) I use a torque wrench for disassembly.

This method "may" indicate if their's a "potential" stretched bolt (low torque) or possible stripped/corroded threads that need inspection.

Excessively high torques may indicate other potential problems like warped heads/block that a previous owner has tried to fix by torqueing up a little more than recommended.

May be of use to you........Barry.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-09-2008, 06:54 PM
1BAD80's Avatar
The Smell of Nitro in the morn
 
Last wiki edit: How to adjust valves Last photo:
Join Date: Jun 2001
Location: Mich
Posts: 2,423
Wiki Edits: 2

Thanks: 0
Thanked 3 Times in 2 Posts
Ditto with DoubleVision, don't matter how.
We pull off very hot heads on a nitro motor without any problem, just pull the pushrods first.
__________________
Luv the smell of NITRO in the morning.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-09-2008, 07:03 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 7,025
Wiki Edits: 0

Thanks: 4
Thanked 516 Times in 436 Posts
Quote:
Originally Posted by v8hed
When removing headbolts, should I loosen in stages or is it acceptable to loosen each bolt all the way, providing the correct sequence is followed? I know that, when tightening, the bolts should be torqued in stages until the final torque value is attained, but I just wondered if the same should apply when loosening the bolts in order to lift the heads.

Thanks,
Ian.
I always take 'em out in reverse order of tightening them for the same reason, avoiding warping the head from the inside to outside. That's to say the tightening sequence is intended to push the stresses from the center to the ends. This prevents the center from being pinched by the ends which will cause it to buckle upwards. Cast iron doesn't like this and for the Chevy head, or any other, where the exhaust valves are adjacent to each other, this will put the point of maximum stress in the place where the casting is most prone to crack. Now just pulling bolts out of a cold engine may not make all that much difference, but why temp Murphy's laws, or in your case Lucas'.

Bogie
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-09-2008, 07:12 PM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
Thanks guys. Think I'll remove the bolts in reverse sequence to tightening, just to be safe. However, I won't bother undoing the bolts in 3-stages; I'll just loosen each bolt fully. On re-assembly, of course, I'll abide by the 3-stage torquing sequence.

Cheers,
Ian.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
90s SBC Power Steering Pump pulley Removal Help Mustangsaly Engine 12 10-08-2006 07:00 PM
turbo sbc question. Super Chevy Engine 3 06-08-2004 05:57 PM
305 SBC question Aces0vr8s Engine 19 05-28-2004 09:18 PM
QUESTION: Where can I get a 350 SBC bare block? 78SilverShark Engine 13 10-05-2003 12:53 AM
SBC Cooling bypass line question HotRodF100 Engine 2 06-15-2002 07:50 PM


All times are GMT -6. The time now is 06:26 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.