The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-02-2011, 05:01 PM   #1
treveiger
Senior Member
 
treveiger's Avatar
 
Join Date: Jul 2010
Location: South Dakota
Posts: 4,093
exhaust manifold bolt replacing?

I have some bolts on my manifold that bolts to my exhaust that are rusted out and I'm wondering how to replace them. I've tried unscrewing them and have had little luck. Any help would be great. The manifolds are already off by the way
__________________
1969 Chevy c20(Miss Hackjob)
treveiger is offline   Reply With Quote
Old 08-02-2011, 05:10 PM   #2
truckster
Senior Member
 
truckster's Avatar
 
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,976
Re: exhaust manifold bolt replacing?

That's a tough one. As far as chemicals go, you could try PB Blaster. I think it's the best for loosening rusted parts. You could try heating the area around the bolts and cooling the bolts too.
truckster is offline   Reply With Quote
Old 08-02-2011, 05:46 PM   #3
cdowns
Senior Member
 
cdowns's Avatar
 
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
Re: exhaust manifold bolt replacing?

i've always heated to bright cherryred to get them to turn
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane

MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF

DONT BELIEVE EVERYTHING YOU THINK

TAKE MY ADVISE;I DON'T USE IT ANYWAY
cdowns is offline   Reply With Quote
Old 08-02-2011, 05:55 PM   #4
treveiger
Senior Member
 
treveiger's Avatar
 
Join Date: Jul 2010
Location: South Dakota
Posts: 4,093
Re: exhaust manifold bolt replacing?

I've shot it with pb blaster already . I think the heating them it the only way... There in there good that's for sure
Posted via Mobile Device
__________________
1969 Chevy c20(Miss Hackjob)
treveiger is offline   Reply With Quote
Old 08-03-2011, 08:04 AM   #5
MARKDTN
Registered User
 
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,165
Re: exhaust manifold bolt replacing?

Quote:
Originally Posted by cdowns View Post
i've always heated to bright cherryred to get them to turn
X2. Get them hot and turn the bolt a little. Repeat and repeat until it comes loose. It takes patience.
__________________
'83 K20-TPI
'73 C10
'79 C10-ex-diesel(SOLD)
'07 Tahoe(Son driving)
'14 Suburban-DD
'71 C10-current project
MARKDTN is offline   Reply With Quote
Old 08-03-2011, 03:26 PM   #6
68 IRON
Registered User
 
68 IRON's Avatar
 
Join Date: Sep 2010
Location: Olympia, WA
Posts: 736
Re: exhaust manifold bolt replacing?

Try working it in both directions also (tightening and loosening). Kroil it up, and lightly try to work it....heat and freeze might work...but just be patient.
Also try lightly tapping the end of the bolt to shake things up. It may take a few days. Good luck.
68 IRON is offline   Reply With Quote
Old 08-03-2011, 05:22 PM   #7
don t. - 72gmc
Registered User
 
Join Date: Dec 2001
Location: harvard, il. USA
Posts: 394
Re: exhaust manifold bolt replacing?

So I've been told.....when you heat them up, but some beeswax on the hot part. Beeswax is supposed to have smaller molacules that will get into tighter areas better than PB/Kroil/WD40.
I've never done it, but some old time tractor restorers swear by it.

HTH..good luck...don t. ....
don t. - 72gmc is offline   Reply With Quote
Old 08-03-2011, 06:06 PM   #8
keenee
Registered User
 
Join Date: Mar 2002
Location: Houston, Pennsylvania
Posts: 231
Re: exhaust manifold bolt replacing?

Heat cherry red as the others have said. The wax thing sounds interesting!
__________________
'96 GMC Suburban 6.5t
'99 F**d Windstar
'07 SON
'09 DAUGHTER
XOXOXO Wife
keenee is offline   Reply With Quote
Old 08-03-2011, 06:11 PM   #9
zellway
Registered User
 
zellway's Avatar
 
Join Date: Dec 2009
Location: Arizona City, AZ
Posts: 747
Re: exhaust manifold bolt replacing?

I don't know if you have this guy but its what I have used in the past. I have also tryed the candle wax trick with a little luck most of the time you just have to heat them up.
Attached Images
 
__________________
-----------------------------------------------------------
Erik
My 69 suburban http://67-72chevytrucks.com/vboard/s...d.php?t=530626
1970 C10 step Project Jiminy http://67-72chevytrucks.com/vboard/s...d.php?t=682647
RUST!? Thats just mother natures way of telling all of us.....MINE!!!!
zellway is offline   Reply With Quote
Old 08-03-2011, 06:18 PM   #10
trkfrk
Registered User
 
trkfrk's Avatar
 
Join Date: Jul 2010
Location: Las Vegas, NV
Posts: 969
Re: exhaust manifold bolt replacing?

In our shop we don't think twice. We grab a torch with a rose bud and get them cherry hot like the guys above said. Works great!
__________________
Mark

1972 C10 SWB LS1/T56 6 speed trans/4:56 posi with 5.5"-7" static drop/Boss 338 Wheels 18"x20"

My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=424609.

My first start up http://youtu.be/R899YQ1OcjU
trkfrk is offline   Reply With Quote
Old 08-03-2011, 10:22 PM   #11
treveiger
Senior Member
 
treveiger's Avatar
 
Join Date: Jul 2010
Location: South Dakota
Posts: 4,093
Re: exhaust manifold bolt replacing?

I don't have a cutting torch lol I might take them to a shop
Posted via Mobile Device
__________________
1969 Chevy c20(Miss Hackjob)
treveiger is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -4. The time now is 08:03 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com