Honda Accord/Prelude 1984-1995 Repair Guide

Exhaust Manifold

Print

REMOVAL & INSTALLATION




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

Except Accord V-6

See Figures 1, 2, 3, 4 and 5

Breaking loose exhaust manifold bolts is one of the nastiest jobs around. They are usually rusted solid; a generous application of penetrating oil several hours before beginning the job will make it easier.

  1. Elevate and safely support the car.
  2.  
  3. Remove the header pipe-to-manifold nuts and separate the pipe from the manifold. Support the pipe with wire; do not allow it to hang by itself.
  4.  
  5. If necessary, disconnect and remove the oxygen sensor(s).
  6.  
  7. If equipped, remove the Air Suction (AS) and Exhaust Gas Recirculation (EGR) crossover pipes.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: On some models, it will be necessary to remove the air suction and EGR crossover pipes

  1. Remove the exhaust manifold heat shield.
  2.  



Click image to see an enlarged view

Fig. Fig. 2: The heat shield is usually secured by three bolts

  1. If applicable, remove the exhaust manifold bracket bolts.
  2.  
  3. Using a crisscross pattern (starting from the center), remove the exhaust manifold-to-cylinder head nuts, the manifold and the gaskets (discard them).
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Use a crisscross pattern when loosening the exhaust manifold nuts



Click image to see an enlarged view

Fig. Fig. 4: After the nuts are removed, the manifold can be removed from the engine

  1. Using a putty knife or similar tool, clean the gasket mounting surfaces. Inspect the mating faces with a straightedge, checking that they are not warped.
  2.  



Click image to see an enlarged view

Fig. Fig. 5: Always replace the gasket

To install:
  1. Using a new gasket and nuts, place the manifold into position and support it. Install the nuts snug on the studs.
  2.  
  3. If applicable, install the support bracket(s) below the manifold. Tighten the bolts holding the bracket(s) to the manifold to 17 ft. lbs. (24 Nm).
  4.  
  5. Starting with the 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. Correct torque is 23 ft. lbs. (32 Nm).
  6.  
  7. Install the heat shield or shroud. Tighten the bolts to 16 ft. lbs. (22 Nm).
  8.  
  9. Connect the AS pipe. Tighten the connections to 50 ft. lbs. (70 Nm).
  10.  
  11. Connect the EGR pipe.
    1. On carbureted engines, tighten the exhaust manifold connection to 43 ft. lbs. (60 Nm) on all models except the 1987 Prelude. On the 1987 Prelude, tighten to 36 ft. lbs. (50 Nm). Tighten the intake manifold connection to 36 ft. lbs. (50 Nm) on Accords to 1989 and Preludes to 1987. On 1988-1990 Preludes, tighten it to 43 ft. lbs. (60 Nm).
    2.  
    3. On fuel injected engines, tighten the exhaust manifold connection to 43 ft. lbs. (60 Nm) and the nuts at the intake manifold to 9 ft. lbs. (12 Nm). Use a new gasket.
    4.  

  12.  
  13. If applicable, install the oxygen sensors. Tighten to 33 ft. lbs. (45 Nm).
  14.  
  15. Connect the exhaust pipe, using new gaskets and nuts. Tighten the exhaust pipe-to-manifold nuts to 40 ft. lbs. (55 Nm).
  16.  

Accord V-6

See Figure 6

Breaking loose exhaust manifold bolts is one of the nastiest jobs around. They are usually rusted solid; a generous application of penetrating oil several hours before beginning the job will make it easier.

  1. Disconnect the negative battery cable.
  2.  
  3. Position a clean drain pan under the radiator and remove the radiator cap. Drain the cooling system.
  4.  
  5. Remove the radiator.
  6.  
  7. Detach the starter cable from the strut tower brace. Remove the brace.
  8.  
  9. If necessary for additional clearance, remove the vacuum control box on the firewall. Position it aside with the vacuum hoses attached.
  10.  



Click image to see an enlarged view

Fig. Fig. 6: Exploded view of the exhaust manifolds used on the Accord V-6

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the front wheels, then remove the splash shield from under the engine.
  4.  
  5. Remove the center beam.
  6.  
  7. Disconnect the exhaust pipe from the exhaust manifolds and the catalytic converter. Remove it from the vehicle.
  8.  
  9. Remove the bolts securing the heat shields on the exhaust manifolds. It will be necessary to work from above and below the engine.
  10.  
  11. Remove the EGR crossover pipe from the engine.
  12.  
  13. Remove the nuts securing the manifolds to the cylinder heads. Once again, it will be necessary to work from above and below the engine. Remove the manifolds and gaskets from the engine.
  14.  

To install:
  1. Using new gaskets and nuts, place the manifolds into position. Lightly oil the threads, then install the nuts snug on the studs.
  2.  
  3. Starting with the 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. Correct torque is 22 ft. lbs. (30 Nm).
  4.  
  5. Install the EGR crossover pipe with a new gasket. Tighten the nuts to 9 ft. lbs. (12 Nm) and the exhaust manifold connection to 43 ft. lbs. (59 Nm).
  6.  
  7. Install the heat shields on the manifolds. Tighten the bolts to 16 ft. lbs. (22 Nm).
  8.  
  9. Install the exhaust pipe with new nuts and gaskets. Tighten the exhaust manifold connections to 40 ft. lbs. (54 Nm) and the catalytic converter to 25 ft. lbs. (33 Nm).
  10.  
  11. Install the center beam. Tighten the bolts to 37 ft. lbs. (50 Nm).
  12.  
  13. Install the splash shield and front wheels.
  14.  
  15. Install the vacuum control box and the radiator.
  16.  
  17. Install the strut tower brace and secure the starter cable. Tighten the bolts to 16 ft. lbs. (22 Nm).
  18.  
  19. Fill the cooling system.
  20.  
  21. Start the engine and allow it to reach normal operating temperature. Check for leaks.
  22.  

 
label.common.footer.alt.autozoneLogo