Acura Coupes and Sedans 1986-1993 Repair Guide

Exhaust Manifold

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REMOVAL & INSTALLATION



Integra

See Figure 1

Do not perform this operation on a warm or hot engine.

  1. Disconnect the negative battery cable. Remove the exhaust manifold shroud.
  2.  
  3. Remove the exhaust pipe-to-exhaust manifold nuts.
  4.  
  5. Remove the oxygen sensor, if equipped.
  6.  
  7. Remove the exhaust manifold bracket bolt.
  8.  
  9. Remove the exhaust manifold-to-cylinder head nuts in a crisscrosss pattern starting from the center and the manifold.
  10.  



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Fig. Fig. 1: Exhaust manifold mounting-Integra

  1. Clean the gasket mounting surfaces. Inspect the manifold for cracks, flatness and/or damage; replace the parts if necessary.
  2.  

To install:
  1. Use new gaskets and reverse the removal procedures. Torque the manifold nuts in a crisscrosss pattern starting from the center, to 23 ft. lbs. (32 Nm) and the exhaust pipe-to-manifold nuts to 40 ft. lbs. (55 Nm).
  2.  
  3. Start the engine and check for leaks.
  4.  

Legend

See Figures 2 and 3

  1. Disconnect the negative battery cable. Remove the exhaust manifold shrouds.
  2.  
  3. Remove the exhaust pipe-to-exhaust manifold nuts.
  4.  
  5. Remove the oxygen sensors.
  6.  
  7. Remove the air suction tube.
  8.  
  9. Remove the exhaust pipe-to-exhaust manifold nuts.
  10.  
  11. Clean the gasket mounting surfaces. Inspect the manifold for cracks, flatness and/or damage; replace the parts, if necessary.
  12.  
  13. Remove the exhaust attaching nuts in a crass-cross pattern starting from the center of the manifold.
  14.  



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Fig. Fig. 2: Exhaust manifold mounting-1986-90 Legend



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Fig. Fig. 3: Exhaust manifold mounting-1991-93 Legend

  1. To install, use new gaskets and reverse the removal procedures. Torque the manifold nuts/bolts in a crisscrosss pattern starting from the center, to 22 ft. lbs. (31 Nm).
  2.  
  3. Use new gaskets when installing the exhaust pipe to the manifold and torque the nuts to 40 ft. lbs. (55 Nm).
  4.  

Vigor

See Figure 4

  1. Remove the heat shields.
  2.  
  3. Disconnect the wiring and remove the oxygen sensor.
  4.  
  5. Disconnect the exhaust pipe.
  6.  
  7. Remove the bracket and remove the nuts to remove the manifold.
  8.  



Click image to see an enlarged view

Fig. Fig. 4: Exhaust manifold mounting-Vigor

  1. Install the bracket loosely and install the manifold with new gaskets and self-locking nuts. Torque the nuts to 23 ft. lbs. (32 Nm), then tighten the bracket bolts.
  2.  
  3. When installing the oxygen sensor, lightly coat the threads with an anti-seize compound. Be careful not to get any on the head of the sensor.
  4.  
  5. Use a new gasket and connect the exhaust pipe. Torque the nuts to 40 ft. lbs. (55 Nm). Install the heat shields.
  6.  

 
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