exhaust manifold bolt replacing? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

treveiger · 08-02-2011, 05:01 PM

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

**truckster** · 08-02-2011, 05:10 PM

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.

cdowns · 08-02-2011, 05:46 PM

i've always heated to bright cherryred to get them to turn

MARKDTN · 08-03-2011, 08:04 AM

Quote:

Originally Posted by cdowns

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.

68 IRON · 08-03-2011, 03:26 PM

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.

treveiger · 08-02-2011, 05:55 PM

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

don t. - 72gmc · 08-03-2011, 05:22 PM

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. ....

keenee · 08-03-2011, 06:06 PM

Heat cherry red as the others have said. The wax thing sounds interesting!

zellway · 08-03-2011, 06:11 PM

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.

trkfrk · 08-03-2011, 06:18 PM

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!

treveiger · 08-03-2011, 10:22 PM

I don't have a cutting torch lol I might take them to a shop
Posted via Mobile Device

08-02-2011, 05:01 PM	#1
treveiger Senior Member 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)

08-02-2011, 05:10 PM	#2
truckster Senior Member 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.

08-02-2011, 05:46 PM	#3
cdowns Senior Member 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

08-03-2011, 03:26 PM	#5
68 IRON Registered User 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.

08-02-2011, 05:55 PM	#6
treveiger Senior Member 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)

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. ....

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

08-03-2011, 06:11 PM	#9
zellway Registered User 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!!!!

08-03-2011, 06:18 PM	#10
trkfrk Registered User 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

08-03-2011, 10:22 PM	#11
treveiger Senior Member 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)

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