Removing factory manifolds / rusted on - Team Camaro Tech
Engine General Engine Discussion.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 19 (permalink) Old Apr 5th, 15, 03:12 PM Thread Starter
Tech Team
Marc
 
Join Date: Nov 2014
Location: DFW Texas
Posts: 33
Removing factory manifolds / rusted on

My car still has the original motor that has never been pulled and the factory manifolds are still in place. The problem is that everything is rusted shut and I still have to remove some exhaust pieces to get the job done.

What should I use to prep this DIY project? PB Blaster? MAPP torch?

That's about all I have that I have access to in my garage.
PMD1969 is offline  
Sponsored Links
Advertisement
 
post #2 of 19 (permalink) Old Apr 5th, 15, 05:11 PM
Senior Tech
Alex
 
Join Date: Feb 2015
Location: Houston TX
Posts: 121
Re: Removing factory manifolds / rusted on

I use a lot of pb blaster on mine I am amazed at how easy the bolts come out.

1969 RS Camaro
1972 K5 Blazer
2010 Dodge Ram 2500 4X4
1969RSCAMARO is offline  
post #3 of 19 (permalink) Old Apr 5th, 15, 05:32 PM
Moderator
____
 
DOUG G's Avatar
 
Join Date: Mar 1999
Location: Maryland, USA
Posts: 19,412
Garage
Send a message via MSN to DOUG G
Re: Removing factory manifolds / rusted on

PB Blaster or Kroil is all I use anymore

Heat the blots up as hot as you can and soak with either of the above....maybe even doing is a few times (every day for a week depending on how bad the rust is)

ALSO be aware.... both are flammable !!!

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
DOUG G is offline  
 
post #4 of 19 (permalink) Old Apr 5th, 15, 09:13 PM Thread Starter
Tech Team
Marc
 
Join Date: Nov 2014
Location: DFW Texas
Posts: 33
Re: Removing factory manifolds / rusted on

PB is a little cheaper and easier to find than Kroil, at least in my area. I have heard that PB Blaster is just ATF thinned down some but I no way of knowing if that is a fact.

Should I run the engine to get it hot and then soak the bolts or do it cold? How long should I let it sit before hitting it with an electric impact gun?

My major concern is snapping bolts in half and getting stuck in the block.
PMD1969 is offline  
post #5 of 19 (permalink) Old Apr 5th, 15, 09:53 PM
Gold Lifetime Member
Roger
 
rogerh's Avatar
 
Join Date: Oct 2004
Location: Quincy, IL
Posts: 18,738
Re: Removing factory manifolds / rusted on

When I removed my exhaust manifolds from the heads I used Liquid Wrench 24 hours before I removed them. They came off with no problem. Removing the exhaust from the exhaust system was another story. I used a sawsall to cut the pipes close to the flanges because I knew I was replacing the exhaust system. Got the manifolds out and used both liquid wrench and heat and still broke the studs in the flanges.

I was really surprised the factory didn't put gaskets between the heads and the manifolds.

I don't have one but I wouldn't use a impact wrench on a 3/8" or smaller bolt that I was worried about breaking. You loose any feeling with a impact.

Roger

1967 Camaro SS/RS 350/295HP Coupe. First and only owner.
rogerh is offline  
post #6 of 19 (permalink) Old Apr 6th, 15, 06:11 AM
DT
Gold Lifetime Member
Donny
 
DT's Avatar
 
Join Date: Jun 2005
Location: Rockland Cty/Melb bch Fla
Posts: 5,215
Garage
Re: Removing factory manifolds / rusted on

I would NOT use an impact gun on the manifolds. A sure way to break a stud in the head !!!! PB Blaster worked very well for me. Soak overnight.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
DT is offline  
post #7 of 19 (permalink) Old Apr 6th, 15, 01:58 PM
Moderator
____
 
DOUG G's Avatar
 
Join Date: Mar 1999
Location: Maryland, USA
Posts: 19,412
Garage
Send a message via MSN to DOUG G
Re: Removing factory manifolds / rusted on

Going by smell alone....PB is NOT ATF

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
DOUG G is offline  
post #8 of 19 (permalink) Old Apr 6th, 15, 02:14 PM
Gold Lifetime Member
George
 
Gbauer's Avatar
 
Join Date: Nov 2012
Location: Frederick, MD
Posts: 8,047
Re: Removing factory manifolds / rusted on

Quote:
Originally Posted by rogerh View Post
I don't have one but I wouldn't use a impact wrench on a 3/8" or smaller bolt that I was worried about breaking. You loose any feeling with a impact.

Roger
Off topic but I bought a cheap Harbor Freight electric impact and it works pretty well for most things. Anything more powerful and I'd worry about breaking bolts/studs.

http://www.harborfreight.com/12-in-h...nch-68099.html

$50 isn't too bad and it comes in handy.

NO IMPACT WRENCHES ON EXHAUST MANIFOLDS. Just wanted to make that clear...

Sold:
1968 Base hardtop 250 with a P̶G̶ built 2004r
Offy intake
Holley 390 CFM carb
Langdon split header to a 2.5" exhaust
Mild cam
Custom interior
Gbauer is offline  
post #9 of 19 (permalink) Old Apr 7th, 15, 08:05 AM Thread Starter
Tech Team
Marc
 
Join Date: Nov 2014
Location: DFW Texas
Posts: 33
Re: Removing factory manifolds / rusted on

Quote:
Originally Posted by Gbauer View Post
Off topic but I bought a cheap Harbor Freight electric impact and it works pretty well for most things. Anything more powerful and I'd worry about breaking bolts/studs.

http://www.harborfreight.com/12-in-h...nch-68099.html

$50 isn't too bad and it comes in handy.

NO IMPACT WRENCHES ON EXHAUST MANIFOLDS. Just wanted to make that clear...
Yeah the electric impact wrench I have is a cheapie but it works great for what I need it for. MY application is a little different so I am not sure what size the bolts are and I will have to ask. Mine is a Pontiac OHC motor and the manifolds are bolted together and then bolted to the head. The Main bolts that hold everything to the heads are pretty big so they might take the impact wrench. I am not sure a socket/extension/wrench will fit to get them out but I'll try it.

Here's a pic of what I am working on:

PMD1969 is offline  
post #10 of 19 (permalink) Old Apr 7th, 15, 10:01 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,723
Garage
Re: Removing factory manifolds / rusted on

Remove manifolds together, one piece.
Should be five bolts and a stud on each end securing them to the head.
9/16 inch socket/wrench.
Also with the exhaust studs/nuts, spray them down and spray the stud thread, and unscrew the nut to where it stops - don't force it.
Screw back onto the stud and flood with rust preventative or an oil and unscrew again.
Repeat as necessary in preventing stud breakage, maybe.

Upon assembly, use brass nuts.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
post #11 of 19 (permalink) Old Apr 7th, 15, 12:57 PM
Senior Tech
Darren
 
Join Date: Nov 2011
Location: Dryden ON
Posts: 496
Re: Removing factory manifolds / rusted on

Big hot hammer!!!
chevysrule454 is offline  
post #12 of 19 (permalink) Old Apr 7th, 15, 02:52 PM Thread Starter
Tech Team
Marc
 
Join Date: Nov 2014
Location: DFW Texas
Posts: 33
Re: Removing factory manifolds / rusted on

Quote:
Originally Posted by Everett#2390 View Post
Remove manifolds together, one piece.
Should be five bolts and a stud on each end securing them to the head.
9/16 inch socket/wrench.
Also with the exhaust studs/nuts, spray them down and spray the stud thread, and unscrew the nut to where it stops - don't force it.
Screw back onto the stud and flood with rust preventative or an oil and unscrew again.
Repeat as necessary in preventing stud breakage, maybe.

Upon assembly, use brass nuts.
Thanks for the tips. Have you owned a OHC before? The manifolds are attached with three bolts at the bottom and it would be very difficult to separate them on the car. My biggest problem is going to be the exhaust. The ultra rare "Y" pipe is something I am going to try and save but I know it will be very difficult. The bolts can be sacrificed but nothing else as they are irreplaceable.
PMD1969 is offline  
post #13 of 19 (permalink) Old Apr 7th, 15, 06:16 PM
Senior Tech
Mike
 
Join Date: Nov 2005
Location: Bluegrass State
Posts: 231
Re: Removing factory manifolds / rusted on

Read something on a forum somewhere and maybe on YouTube that a 50/50 mix of ATF and Actone was the best for loosening rusty bolts and nuts.
69z28302 is offline  
post #14 of 19 (permalink) Old Apr 7th, 15, 06:26 PM
Gold Lifetime Member
George
 
Gbauer's Avatar
 
Join Date: Nov 2012
Location: Frederick, MD
Posts: 8,047
Re: Removing factory manifolds / rusted on

Quote:
Originally Posted by PMD1969 View Post
Yeah the electric impact wrench I have is a cheapie but it works great for what I need it for. MY application is a little different so I am not sure what size the bolts are and I will have to ask. Mine is a Pontiac OHC motor and the manifolds are bolted together and then bolted to the head. The Main bolts that hold everything to the heads are pretty big so they might take the impact wrench. I am not sure a socket/extension/wrench will fit to get them out but I'll try it.

Here's a pic of what I am working on:

I'm pretty familiar with that style engine...





Head over to www.inliners.org. Great site for inline 6 engines.

Mine: Offy intake, Langdon headers, 2.5" single exhaust to a Flowmaster 44, Holley 8007 390 CFM carb, HEI distributor, and electric fan conversion.


...and still DON'T USE AN IMPACT WRENCH ON YOUR MANIFOLD BRIDGE STUDS AND BOLTS.

(had to modify that a bit for you...)


To get it off you have bridges studs and nuts. The bridges are between the intake and exhaust manifold. There's a single stud between and a bridge. You might not be able to get a ratchet wrench in there. I believe the nuts are all 9/16". There are no nuts/studs on the ends. Only between the manifolds.



Step 1) Soak the heck out of it for a week in PB.

Step 2) Remove carb.

Step 3) Unbolt exhaust from exhaust manifold

Step 4) Remove power steering and bracket.

Step 5) Remove all vacuum lines.

Step 6) Break studs/nuts loose with box end of wrench.


Be sure to have a really good gasket on hand. Also I recommend copper RTV. Sealing the manifolds to the head is a PITA. I wouldn't take the intake apart from the exhaust unless you have a darn good reason to do so. I believe there are three bolts to do it. Two are visible. One is hidden away under a heat shield on the exhaust manifold (if you still have yours).


edit: Why are you removing them? I might have other fixes for you if I know a bit more.


If you want more power there are several options. Inliners really is the best way to find out about what's possible.

Sold:
1968 Base hardtop 250 with a P̶G̶ built 2004r
Offy intake
Holley 390 CFM carb
Langdon split header to a 2.5" exhaust
Mild cam
Custom interior

Last edited by Gbauer; Apr 7th, 15 at 06:37 PM.
Gbauer is offline  
post #15 of 19 (permalink) Old Apr 8th, 15, 05:13 PM Thread Starter
Tech Team
Marc
 
Join Date: Nov 2014
Location: DFW Texas
Posts: 33
Re: Removing factory manifolds / rusted on

Holy huge photo's !!! I am guessing that it is a Chevy inline six?
PMD1969 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user 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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome