Acura Coupes and Sedans 1994-2000 Repair Information

Exhaust Manifold

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REMOVAL & INSTALLATION



The radio may have a coded theft protection circuit. Make sure you have the code before disconnecting the battery, removing the radio fuse, or removing the radio.

1.8L Engines


WARNING
This procedure should only be performed on a cold engine. See Figures 1 through 6



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Fig. Fig. 1: Removal of the heat shield from the exhaust manifold -Integra 1.8L



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Fig. Fig. 2: Use caution when removing the exhaust manifold bolts, as they may be rusted and will snap off easily



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Fig. Fig. 3: Remove the down pipe from the exhaust manifold



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Fig. Fig. 4: Using both hands, pull the exhaust manifold away from the cylinder head



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Fig. Fig. 5: The lower support bracket may also have to be removed from the exhaust manifold



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Fig. Fig. 6: Exhaust manifold-1.8L engines

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the exhaust manifold cover.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Remove the three nuts attaching the front exhaust pipe to the exhaust manifold. Discard the nuts. Separate the exhaust pipe from the manifold and discard the gaskets.
  8.  
  9. Lower the vehicle.
  10.  
  11. Disconnect the bracket attaching the exhaust manifold to the engine.
  12.  
  13. Remove the exhaust manifold attaching nuts and discard the nuts.
  14.  
  15. Remove the exhaust manifold from the engine. Clean any old gasket material from the engine and the exhaust manifold mating surfaces.
  16.  
  17. Remove the rear cover from the exhaust manifold.
  18.  

To install:
  1. Install the rear cover to the exhaust manifold and tighten the mounting bolts to 17 ft. lbs. (24 Nm).
  2.  
  3. Install a new exhaust manifold gasket to the cylinder head.
  4.  
  5. Install the exhaust manifold to the engine and install new attaching nuts. Tighten the nuts to 23 ft. lbs. (31 Nm).
  6.  
  7. Install the bracket to the exhaust manifold and the engine. Tighten the bolts to 33 ft. lbs. (44 Nm).
  8.  
  9. Raise and safely support the vehicle.
  10.  
  11. Install new gaskets to the front exhaust pipe where it connects to the exhaust manifold.
  12.  
  13. Connect the front exhaust pipe to the exhaust manifold. Install new nuts and tighten the nuts to 40 ft. lbs. (54 Nm).
  14.  
  15. Lower the vehicle.
  16.  
  17. Install the exhaust manifold cover and tighten the bolts to 17 ft. lbs. (24 Nm).
  18.  
  19. Connect the negative battery cable and enter the radio security code.
  20.  
  21. Run the engine and check for exhaust leaks.
  22.  

2.2L, 2.3L Engines

  1. Disconnect the negative battery cable.
  2.  
  3. Safely raise and support the vehicle.
  4.  
  5. If the Oxygen (O 2 S) sensor is located in the exhaust manifold, detach the O 2 S sensor connector.
  6.  
  7. Remove the exhaust manifold upper cover.
  8.  
  9. If equipped with air conditioning, remove the heat insulator from the manifold.
  10.  
  11. Remove the nuts attaching the exhaust manifold to the front exhaust pipe. Separate the pipe from the manifold and discard the gasket. Support the pipe with wire; do not allow it to hang by itself.
  12.  
  13. Remove the exhaust manifold bracket(s) bolts and remove the bracket(s).
  14.  
  15. Using a crisscross pattern (starting from the center), remove the exhaust manifold attaching nuts.
  16.  
  17. Remove the manifold and discard the gasket. Clean the manifold and cylinder head mating surfaces.
  18.  
  19. If equipped, remove the lower manifold cover from the manifold.
  20.  

To install:
  1. If equipped, install the lower manifold cover, tighten the attaching bolts to 16 ft. lbs. (22 Nm).
  2.  
  3. Using a new gasket and nuts, place the manifold into position and support it. Install the nuts snug on the studs.
  4.  
  5. Install the support bracket(s) below the manifold. Tighten the bracket(s) mounting bolts to 33 ft. lbs. (44 Nm).
  6.  
  7. Starting with the manifold inner or center nuts, tighten the nuts in a crisscross pattern to the correct torque. The tension must be even across the entire face of the manifold if leaks are to be prevented. Tighten the nuts to 23 ft. lbs. (31 Nm).
  8.  
  9. Install the upper manifold cover, tighten the bolts to 16 ft. lbs. (22 Nm).
  10.  
  11. If disconnected, attach the O 2 S connector.
  12.  
  13. Connect the front exhaust pipe, using new gaskets and nuts. Tighten the exhaust pipe attaching nuts to 40 ft. lbs. (55 Nm).
  14.  
  15. Connect the negative battery cable and enter the radio security code.
  16.  
  17. Start the engine and check for exhaust leaks.
  18.  

2.5L Engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the outer manifold heat shields.
  4.  
  5. Disconnect the wire and remove the Oxygen (O 2 S) sensor from the manifold.
  6.  
  7. Disconnect the manifold from exhaust pipe.
  8.  
  9. Remove the mounting bracket and remove the nuts to remove the manifold.
  10.  

To install:
  1. Be sure the gasket mating surfaces are clean. Install the bracket loosely and install the manifold with new gaskets and self-locking nuts. Tighten the nuts to 23 ft. lbs. (31-32 Nm), then tighten the bracket bolts. Be sure not to bend or damage the contact surface of the metal gasket.
  2.  
  3. Coat the threads of the O 2 S sensor with an anti-seize compound. Be careful not to get any on the head of the sensor. Install the sensor and carefully tighten to 33 ft. lbs. (44-45 Nm). Connect the sensor wire.
  4.  
  5. Install a new gasket and connect the manifold to the exhaust pipe. Tighten the nuts to 40 ft. lbs. (54-55 Nm). Install the outer manifold heat shields and tighten the bolts to 22 ft. lbs. (29 Nm).
  6.  
  7. Connect the negative battery cable. Start the engine and check for exhaust leaks.
  8.  

3.0L Engine

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the engine undercover.
  4.  
  5. Disconnect the exhaust pipe from the manifold to be removed.
  6.  
  7. Lower the vehicle.
  8.  
  9. Remove the exhaust manifold heat shield.
  10.  
  11. Remove the mounting nuts and the exhaust manifold.
  12.  

See Figure 7

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Fig. Fig. 7: Exploded view of the front exhaust manifold mounting-3.0L engine

To install:
  1. Clean the mounting surfaces.
  2.  
  3. Position a new gasket on the cylinder head.
  4.  
  5. Install the exhaust manifold. Tighten the nuts to 23 ft. lbs. (31 Nm).
  6.  
  7. Install the heat shield. Tighten the bolts to 16 ft. lbs. (22 Nm).
  8.  
  9. Raise the vehicle and connect the exhaust pipe to the manifold using a new gasket. Tighten the nuts to 40 ft. lbs. (54 Nm).
  10.  

3.2L and 3.5L Engines

This operation should be performed with the engine and exhaust cold.

  1. Disconnect the negative battery cable. Be sure the engine is not hot or warm before performing this operation. Remove the exhaust manifold shrouds.
  2.  
  3. If applicable, remove the two small heat shields from the cylinder heads.
  4.  
  5. Remove the exhaust pipe nuts.
  6.  
  7. Remove the Oxygen (O 2 S) sensors.
  8.  
  9. Remove the air suction tube.
  10.  
  11. Remove the exhaust attaching nuts in a crisscross pattern starting from the center of the manifold.
  12.  
  13. Clean the gasket mounting surfaces. Inspect the manifold for cracks, flatness and/or damage; replace the parts, if necessary.
  14.  

To install:
  1. To install, use new gaskets and self-locking nuts. Be sure all mating surfaces are clean before installing exhaust manifold. Tighten the manifold nuts in a crisscross pattern starting from the center, for 3.2TL, tighten the manifold nuts to 22 ft. lbs. (30 Nm).
  2.  
  3. If applicable, install the two small heat shields and tighten the attaching bolts to 16 ft. lbs. (22 Nm).
  4.  
  5. Use new gaskets when installing the exhaust pipe to the manifold and tighten the nuts to 40 ft. lbs. (55 Nm).
  6.  
  7. Install the air suction tube, then install the O 2 S sensors. Tighten the O 2 S sensors to 33 ft. lbs. (45 Nm).
  8.  
  9. Install the manifold shrouds, tightening the bolts to 16 ft. lbs. (22 Nm).
  10.  
  11. Verify that all vacuum lines and wiring are properly connected.
  12.  
  13. Reconnect the negative battery cable, then start the engine and check for leaks.
  14.  

 
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