Removing Original Head Studs - Rennlist - Porsche Discussion Forums

Notices

Removing Original Head Studs

Old 04-27-2017, 10:14 PM
  #1  
refresh951
Moderator
Rennlist Member
Thread Starter
 
refresh951's Avatar
 
Join Date: Jun 2010
Location: Marietta, Georgia
Posts: 3,329
Default Removing Original Head Studs

My machinist is trying to remove original head studs from an 87 block. I have had the block for years sitting out back of my house. It was covered but not sealed and so saw some corrosion. He has removed studs from many 944 blocks without issue but two of the studs are really stuck. He is afraid they are going to break.

My question is will heat help and how should it be applied? I have read and some say heat the stud then quench, some say heat the block around the stud. Looking for knowledgeable input. TIA.
refresh951 is offline  
Old 04-27-2017, 10:38 PM
  #2  
odonnell
Super User
 
odonnell's Avatar
 
Join Date: Nov 2012
Location: Houston TX
Posts: 4,572
Default

I used a basic propane torch around the threaded portion of the block. It was the intake side that was the most stuck on my block. Factory used some sort of thread locker on them.
odonnell is online now  
Old 04-27-2017, 11:04 PM
  #3  
gruhsy
Addict
Rennlist Member
 
gruhsy's Avatar
 
Join Date: Dec 2009
Posts: 2,184
Default

Try a mix of acetone and ATF used like WD-40 it is supposed to work to break loose stuck hardware.

next best option is this:

http://www.kanolabs.com/penLub.html

Alternative to heat method if it is corrosion.
gruhsy is offline  
Old 04-27-2017, 11:11 PM
  #4  
Black51
Addict
Rennlist Member
 
Join Date: May 2010
Location: Edmonton, AB
Posts: 1,802
Default

Aluminum expands and contracts far more than steel. The purpose of heat is to cause dimensional upset. As the part cools is the time when it will loosen up. I imagine by the time you got the studs at a high enough temperature to cause this, the block would already be smoking hot. My vote is to heat the block around the stud, if not both.

Quenching is probably the last thing I would do if you're concerned about breaking the studs. I'm not sure if those studs are heat treatable, but if they are, there's a chance of hardening and thus making them more brittle if you quench.
Black51 is offline  
Old 04-27-2017, 11:20 PM
  #5  
blade7
User
 
blade7's Avatar
 
Join Date: Dec 2007
Location: England UK
Posts: 1,672
Default

All but one came straight out of a 2.7 block I've got, the last one wouldn't move so I used penetrating fluid and a heat gun on the outside of the block. I had to turn that stud backwards and forwards a quarter turn nearly all the way out otherwise I think it would have snapped.
blade7 is offline  
Old 04-27-2017, 11:39 PM
  #6  
Droops83
Addict
Rennlist Member
 
Droops83's Avatar
 
Join Date: Feb 2003
Location: Santa Barbara, CA
Posts: 1,144
Default

Droops83 is offline  
Old 04-28-2017, 12:10 AM
  #7  
mahoney944
User
 
mahoney944's Avatar
 
Join Date: Jul 2013
Posts: 921
Default

Heated mine with a map gas torch bought from a local hardware store. Then used a large pipe wrench to turn them out. Didn't hurt a thing.
mahoney944 is offline  
Old 04-28-2017, 07:03 AM
  #8  
Adonay
Addict
Rennlist Member
 
Adonay's Avatar
 
Join Date: Aug 2009
Location: norway and or sweden
Posts: 813
Default

A combination of heat, double nut, huge pipewrench "like pictured above" and a knipex cobra wrench was used on the last block i did this on . I wonder how easy it would have been with a stud extractor ?
Adonay is offline  
Old 04-28-2017, 10:21 AM
  #9  
Willard Bridgham 3
Addict
Rennlist Member

 
Willard Bridgham 3's Avatar
 
Join Date: May 2001
Location: Parral, Chihuahua, Mejico
Posts: 914
Default

PB Blaster and let it sit for at least 2 days.
Willard Bridgham 3 is offline  
Old 04-28-2017, 12:41 PM
  #10  
V2Rocket
Rainman
Rennlist Member
 
V2Rocket's Avatar
 
Join Date: Jan 2007
Location: Rancho Cucamonga, CA
Posts: 41,915
Default

do you have a barbeque at least block-sized...
V2Rocket is offline  
Old 04-28-2017, 01:54 PM
  #11  
kev951
User
 
kev951's Avatar
 
Join Date: Jan 2010
Location: San Mateo, CA
Posts: 786
Default

use heat at the lowest point of the studs in the block; that is where the factory adhesive is. then use a stud remover kit or stud socket. Works everytime, but patience is critical.
kev951 is offline  
Old 04-28-2017, 02:55 PM
  #12  
951and944S
Super User
 
951and944S's Avatar
 
Join Date: Dec 2001
Location: New Orleans/Baton Rouge
Posts: 3,126
Default

Tig weld the nuts (1 per stud) to the stud an inch or two down.

You have a removal mechanism and the heat from the tig loosens the factory grip.

Sometimes I'll run the tig torch down the stud too an inch or two short of the block surface.

I fought this for years too.....until I tried the method I described.

I can have all head stud out in 10-15 minutes.

I'll make a video on a wager if anybody is doubtful enough to up some coin...

T
951and944S is offline  
Old 04-28-2017, 04:31 PM
  #13  
951and944S
Super User
 
951and944S's Avatar
 
Join Date: Dec 2001
Location: New Orleans/Baton Rouge
Posts: 3,126
Default

Here ya go - Propane just happened to be in a pic, Miller Diversion in the background is what I use.









T

Last edited by 951and944S; 04-28-2017 at 05:03 PM.
951and944S is offline  
Old 04-28-2017, 05:11 PM
  #14  
Chris White
Addict
Rennlist Member

Rennlist Small
Business Sponsor

 
Chris White's Avatar
 
Join Date: Jul 2001
Location: Marietta, NY
Posts: 7,352
Default

+2 on TIG (or Mig) welding on some nuts. I usually do that and then use an impact gun to take them out. Its never fun!
Chris White is offline  
Old 04-28-2017, 06:15 PM
  #15  
refresh951
Moderator
Rennlist Member
Thread Starter
 
refresh951's Avatar
 
Join Date: Jun 2010
Location: Marietta, Georgia
Posts: 3,329
Default

Really appreciate all the input. We are going to try some heat. I will post the results
refresh951 is offline  

Thread Tools
Search this Thread
Quick Reply: Removing Original Head Studs


Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: