GM Camaro 1967-1981 Repair Guide

Exhaust Manifold

Print

REMOVAL & INSTALLATION



230 and 250 cid Engines
1967-74 MODELS

Exhaust manifold removal for these model years is covered in the "Intake Manifold Removal and Installation" section earlier in this chapter.

1975-76 MODELS

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Engine exhaust manifold tightening sequence-1975-79 inline 6-cylinder (250 cid) engines

  1. Remove the air cleaner.
  2.  
  3. Remove the power steering and air pump brackets.
  4.  
  5. Remove the EFE valve bracket.
  6.  
  7. Disconnect the throttle linkage and return spring.
  8.  
  9. Unbolt the exhaust pipe from the flange.
  10.  
  11. Unbolt and remove the manifold.
  12.  
  13. Reverse the procedure for installation. Tighten the four end bolts to specifications last.
  14.  

1977-79 MODELS
  1. Disconnect the negative (-) battery cable and remove the air cleaner.
  2.  
  3. Remove the power steering and/or AIR pumps and brackets, where they are present. (You need not disconnect power-steering hoses-just support the pump out of the way.)
  4.  
  5. Working from below, with the vehicle safely supported, disconnect the exhaust pipe at the manifold and at the catalytic converter bracket near the transmission mount. If the car uses an exhaust manifold mounted converter, disconnect the pipe at the bottom of the converter, then remove the converter.
  6.  
  7. Working from above, remove the rear heat shield and accelerator cable bracket.
  8.  
  9. Remove the exhaust manifold bolts, and pull off the manifold.
  10.  
  11. If the manifold is to be replaced, transfer the EFE valve, actuator, and rod assembly to the new part. Otherwise, inspect the manifold as described in Step 7.
  12.  
  13. Clean and inspect the manifold carefully for cracks and for free operation of the EFE valve. Repair or replace parts, and free up the EFE valve with solvent, if necessary.
  14.  
  15. Make sure the gasket surface is clean and free of deep scratches. Position a new gasket on the manifold, then put the manifold in position on the block and install the bolts hand-tight.
  16.  
  17. Tighten all bolts [cf2]in the proper order to the specified torque (see illustration).
  18.  
  19. Install the rear heat shield and the accelerator cable bracket.
  20.  
  21. Working from underneath, connect the exhaust pipe at the manifold flange and connect the converter bracket at the transmission mount. If the car has an exhaust manifold converter, first install the converter to the manifold loosely; then attach the exhaust pipe to the converter and align the exhaust system; finally tighten the converter mounting bolts to 15 ft. lbs., in an X pattern, and tightening in several stages.
  22.  
  23. Working from above, install the power steering and A.I.R. pumps as necessary. Then, install the air cleaner and connect the battery ground cable.
  24.  

Except 230 and 250 cid Engines

See Figure 2



Click image to see an enlarged view

Fig. Fig. 2: Identification, location and torque specifications for the mounting bolts used on 229 cid V6 and all V8 engine exhaust manifolds

  1. If equipped with AIR, remove the air injector manifold assembly. The 1 / 4 in. pipe threads in the manifold are straight threads. Do not use a 1 / 4 in. tapered pipe tap to clean the threads.
  2.  
  3. Disconnect the battery.
  4.  
  5. If applicable, remove the air cleaner pre-heater shroud.
  6.  
  7. Remove the spark plug wire heat shields. On Mark IV engines, remove the spark plugs.
  8.  
  9. On the left exhaust manifold, disconnect and remove the alternator.
  10.  
  11. Disconnect the exhaust pipe from the manifold and hang it from the frame out of the way.
  12.  
  13. Bend the locktabs and remove the end bolts, then the center bolts. Remove the manifold.
  14.  

A9/16in. thin wall 6-point socket, sharpened at the leading edge and tapped onto the head of the bolt, simplifies bending the locktabs.

When installing a new manifold on the right side on 1978 and later V8s you must transfer the heat stove from the old manifold to the new one.

  1. Installation is the reverse of removal. Clean all mating surfaces and use new gaskets. Tighten all bolts to specifications from the inside working out.
  2.  

 
label.common.footer.alt.autozoneLogo