We are currently running on the new domain and server: www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Stuck headstuds in aluminum block

General engine tech -- Drag Racing to Circle Track

Moderator: Team

User avatar
Baprace
HotPass
HotPass
Posts: 1686
Joined: Sun Aug 06, 2006 4:57 am
Location: Henrietta NY 14623

Re: Stuck headstuds in aluminum block

Post by Baprace » Wed Nov 27, 2019 6:58 am

Caprimaniac wrote:
Tue Nov 26, 2019 6:20 am
Got this SBF alu Block. 1/2" studs won't come out. Outer studs, maybe water seeped in, or? Middle Three worst.

Tried two nuts counterbound, no Luck. Going to try heat. Any other suggestions?
Mayby just leaving the studs alone would be the best decision, once you fu%k it up you have alot bigger problem , JMO

n2xlr8n
HotPass
HotPass
Posts: 680
Joined: Tue Jun 28, 2005 9:01 pm
Location: Bama

Re: Stuck headstuds in aluminum block

Post by n2xlr8n » Wed Nov 27, 2019 10:55 am

I learned the acetone+ATF trick here a while back and it's never failed me. Occasionally I'll add heat with it.

Now I have to remember the 300A welding lead trick.
He who is in me is greater than he who is in the world.

rebelyell
New Member
New Member
Posts: 30
Joined: Mon Dec 03, 2018 8:46 am
Location: SOUTH CAROLINA

Re: Stuck headstuds in aluminum block

Post by rebelyell » Wed Nov 27, 2019 10:29 pm

Nefario wrote:
Tue Nov 26, 2019 10:31 am
If you get scared with heat and beat, there's always alum, warmth, and time...

https://hackaday.com/2015/08/03/dissolv ... e-grocery/

https://www.practicalmachinist.com/vb/g ... um-158766/
Alum ! :shock:

For millennia, females have used alum to shrink the volumetric profiles of their "Lady Bits" ... so, once done with the steel ???

https://serrestick.com/blogs/news/let-s ... nal-health

Joe-71
HotPass
HotPass
Posts: 116
Joined: Sat Apr 08, 2017 5:46 pm
Location:

Re: Stuck headstuds in aluminum block

Post by Joe-71 » Wed Nov 27, 2019 11:54 pm

Sometimes with aluminum, you need to tighten the stud first. Double nut, torque +10 lb, and then try to remove. Seems to be a case of not installing the stud hand tight and then back out 1/4 turn. Joe-JDC
Joe-JDC

Momus
Member
Member
Posts: 87
Joined: Tue Aug 13, 2013 8:38 am
Location:

Re: Stuck headstuds in aluminum block

Post by Momus » Thu Nov 28, 2019 3:53 am

Leftcoaster wrote:
Wed Nov 27, 2019 1:58 am
Firmly connect a ~300amp arc welder's leads to block and stud respectively, switch on for 10s then check leads, clamps, and stud temperatures

Try tightening then loosening the stud - - repeat 10s applications if the stud doesn't move and heat isn't excessive

The more corrosion around the thread the greater the resistance and the hotter that area becomes

An old time ZA mechanic swore this method was the only cure for Alfa 4cyl engines run without antifreeze

Head studs on those all ali engines pass through a common coolant jacket and into the block
And I always thought those diabolical Alfa studs were cast in.

User avatar
Caprimaniac
Expert
Expert
Posts: 819
Joined: Fri Nov 18, 2011 1:17 pm
Location: NORWAY

Re: Stuck headstuds in aluminum block

Post by Caprimaniac » Fri Nov 29, 2019 3:33 am

Baprace wrote:
Wed Nov 27, 2019 6:58 am
Caprimaniac wrote:
Tue Nov 26, 2019 6:20 am
Got this SBF alu Block. 1/2" studs won't come out. Outer studs, maybe water seeped in, or? Middle Three worst.

Tried two nuts counterbound, no Luck. Going to try heat. Any other suggestions?
Mayby just leaving the studs alone would be the best decision, once you fu%k it up you have alot bigger problem , JMO
Certainly agree.... But; the Block is to be bored, and I figure the studs gotta go? OR?

In for a plate hone, and then they need to go on...

I'll grab a can of acetone & head for the shop tomorrow. Will see how much damage I'll manage to do.

Happy motoring!
How to turn GURU in an instant.....

User avatar
Baprace
HotPass
HotPass
Posts: 1686
Joined: Sun Aug 06, 2006 4:57 am
Location: Henrietta NY 14623

Re: Stuck headstuds in aluminum block

Post by Baprace » Fri Nov 29, 2019 11:55 pm

Caprimaniac wrote:
Fri Nov 29, 2019 3:33 am
Baprace wrote:
Wed Nov 27, 2019 6:58 am
Caprimaniac wrote:
Tue Nov 26, 2019 6:20 am
Got this SBF alu Block. 1/2" studs won't come out. Outer studs, maybe water seeped in, or? Middle Three worst.

Tried two nuts counterbound, no Luck. Going to try heat. Any other suggestions?
Mayby just leaving the studs alone would be the best decision, once you fu%k it up you have alot bigger problem , JMO
Certainly agree.... But; the Block is to be bored, and I figure the studs gotta go? OR?

In for a plate hone, and then they need to go on...

I'll grab a can of acetone & head for the shop tomorrow. Will see how much damage I'll manage to do.

Happy motoring!
Capri , any one have a Sunnen CK-10 hone machine near you ? That machine will hone .030 faster than you can bore it and the studs should not be a problem.

User avatar
Caprimaniac
Expert
Expert
Posts: 819
Joined: Fri Nov 18, 2011 1:17 pm
Location: NORWAY

Re: Stuck headstuds in aluminum block

Post by Caprimaniac » Sun Dec 01, 2019 7:43 am

The shop has a Sunnen, not sure what model, though.

One stubborn sucker left....

All came out good, no threads gone, which is great.

However: holes are blind. And there has been water there...

I have always been sceptical about this: In alu block the sleeves stand proud, how much? 0,05mm?, and what happens in a cold engine: will the gaskets really seal up so water and oil stay where they should be? I don’t know...
Maybe small beads of silicone around the water holes?
How to turn GURU in an instant.....

Kevin Johnson
HotPass
HotPass
Posts: 8261
Joined: Tue Nov 22, 2005 5:41 am
Location:

Re: Stuck headstuds in aluminum block

Post by Kevin Johnson » Sun Dec 01, 2019 12:11 pm

Caprimaniac wrote:
Sun Dec 01, 2019 7:43 am
The shop has a Sunnen, not sure what model, though.

One stubborn sucker left....

All came out good, no threads gone, which is great.

However: holes are blind. And there has been water there...

I have always been sceptical about this: In alu block the sleeves stand proud, how much? 0,05mm?, and what happens in a cold engine: will the gaskets really seal up so water and oil stay where they should be? I don’t know...
Maybe small beads of silicone around the water holes?
If you need them, I can look up the liner protrusion specs for the Renault alloy blocks with iron wet liners. They later switched to an o-ring seal.

tenxal
Expert
Expert
Posts: 588
Joined: Sun Nov 17, 2013 8:48 pm
Location:

Re: Stuck headstuds in aluminum block

Post by tenxal » Sun Dec 01, 2019 3:07 pm

Caprimaniac wrote:
Sun Dec 01, 2019 7:43 am
All came out good, no threads gone, which is great. However: holes are blind. And there has been water there...
Make sure there is a decent chamfer around the stud.

shoedoos
Expert
Expert
Posts: 548
Joined: Wed Aug 09, 2006 3:14 am
Location: New Zealand

Re: Stuck headstuds in aluminum block

Post by shoedoos » Sun Dec 01, 2019 4:54 pm

for future reference the "old" melted candle wax down the threads works effectively as well....

Post Reply