![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Nov 2009
Location: vacaville california
Posts: 109
|
Exhaust Manifold Replacement
My son has a 71 Cheyenne with a 350 and we are gettin ready to replace the Drivers side exhaust manifold. We have been hitting the bolts with penetrating oil all week. Problem is that one of the bolts appears to already be loose. It turns freely and wiggles but it doesnt come all the way out. Hoping this isn't a broken bolt? Also I know from other posts that the bolts are 3/8 & 16 but does anyone know how long the originals are?? If the bolts is broken and we have to drill and tap it anyone know what the right size drill bit is to accomplish this? How dow we know how far to drill in with out going to far??? Thanks in advance for your help!!!!!
|
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
|
Re: Exhaust Manifold Replacement
The rusty bolts grow a "waistline" of rust which prevents them from pulling out easily when loose. If it is turning freely, it is probably broken off. I pull the head off to drill out and retap. I don't know how you could do it easily with the engine in the truck. Maybe by dropping the inner fender out of the way. Because I had the head on a bench, I was able to center the pilot drill carefully, insure that I was drilling straight, and used successively larger drills until I was almost to the threads. Got the shell of the bolt out and then cleaned things up with a bottom tap.
__________________
1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Nov 2009
Location: Idaho
Posts: 34
|
Re: Exhaust Manifold Replacement
A good set of left handed Drill bits is a gerat thing to use on any broken bolt. Instead of screwing the bolt in it tends to grab with some good pressure and unscrew the bolt. Heat and cold work wonders also. I had the same problem on my drivers side manifold. I had enough to get a vice grip on it. I bolted the manifold on it and ran it untill it got hot took off my manifold and gave it alot of pen oil then used ice to cool the stud and went after it with the vice grips. It didnt fall out but it did come out after a few cycles.
|
![]() |
![]() |
![]() |
#4 |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
|
Re: Exhaust Manifold Replacement
|
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
|
Re: Exhaust Manifold Replacement
When i have a broken bolt to get out i weld a nut to it and then remove it.
__________________
Fuzzy |
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Oct 2008
Location: Macon, GA.
Posts: 89
|
Re: Exhaust Manifold Replacement
I recently replaced the Manifolds on my 71-C10, man what a head ache. Many bolts broke, fortunately they usually break about mid way because they're so rusted. I finally knocked a hole in the top of one Manifold and took a long prybar to it. Came of in about 6 pieces.
![]() My Manifolds were cracked so bad they looked like they had Lepracy. ![]() |
![]() |
![]() |
![]() |
#7 | |
Registered User
Join Date: Sep 2010
Location: Santa Rosa, Ca
Posts: 131
|
Re: Exhaust Manifold Replacement
Quote:
I like the though of removing it in pieces, since it already is. Good idea. I just have to make sure pieces don't end up in my exhaust port.
__________________
1971 Chevy C-20 Flatbed SBC350/Turbo 350 "Torque Is Controlled Power" |
|
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
|
Re: Exhaust Manifold Replacement
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
![]() |
![]() |
![]() |
Bookmarks |
|
|