Honda Accord/Civic/Prelude 1973-1983 Repair Guide

Intake Manifold

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REMOVAL & INSTALLATION



Carbureted Models
NON-CVCC ENGINES

See Figures 1, 2, 3 and 4

  1. Disconnect the negative battery cable. Place a clean pan under the radiator, remove the drain plug and drain the cooling system.
  2.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the air cleaner and case.
  2.  
  3. Refer to the Carburetor, Removal & Installation procedures in Fuel System and remove the carburetor from the intake manifold.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Intake manifold torque sequence (early models)



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Fig. Fig. 2: Intake manifold torque sequence (later models)



Click image to see an enlarged view

Fig. Fig. 3: Removing the intake manifold retaining nuts



Click image to see an enlarged view

Fig. Fig. 4: Removing the intake manifold-note the shop towel in the carburetor mount opening

  1. Remove the emission control hoses from the manifold T-joint; one hose leads to the condensation chamber and the other leads to the charcoal canister.
  2.  
  3. Remove the hose connected to the intake manifold directly above the T-joint and underneath the carburetor, leading to the air cleaner check valve (refer to diagrams of the various emission control hose connections, if necessary).
  4.  
  5. Remove the electrical connectors from the thermoswitches.
  6.  
  7. Remove the solenoid valve located next to the thermoswitch.
  8.  
  9. Remove the intake manifold-to-cylinder head nuts in a crisscross pattern, beginning from the center and moving out to both ends, then, remove the manifold.
  10.  
  11. Using a putty knife, clean the gasket mounting surfaces of the manifold and the cylinder head.
  12.  
  13. If the intake manifold is to be replaced, transfer all necessary components to the new manifold.
  14.  
  15. To install, use new gaskets, sealant (if necessary) and reverse the removal procedure, being sure to observe the following points:
    1. Apply a water-resistant sealer to the new intake manifold gasket before positioning it in place.
    2.  
    3. Be sure all hoses are properly connected.
    4.  
    5. Tighten the manifold attaching nuts in the reverse order of removal.
    6.  

  16.  

1829cc ENGINE

See Figures 5 and 6

  1. Disconnect the negative battery cable. Position a clean drain pan under the radiator, remove the drain plug and drain the cooling system.
  2.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the air cleaner and housing from the carburetor(s).
  2.  
  3. Remove the air valve, the EGR valve, the air suction valve and the air chamber (if equipped).
  4.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the intake and exhaust manifolds-Prelude



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Fig. Fig. 6: Exploded view of the intake manifold-Accord

  1. Label and disconnect any electrical connectors from the carburetor(s) and intake manifold.
  2.  
  3. Disconnect the fuel line(s) from the carburetor. Disconnect the throttle cable from the carburetor.
  4.  
  5. Remove the carburetor(s) from the intake manifold.
  6.  
  7. Remove the intake manifold-to-cylinder head nuts (using a crisscross pattern), beginning from the center and moving out to both ends, then remove the manifold.
  8.  
  9. Using a putty knife, clean the gasket mounting surfaces.
  10.  
  11. If the intake manifold is to be replaced, transfer all the necessary components to the new manifold.
  12.  
  13. To install, use new gaskets, sealant (if necessary) and reverse the removal procedures. Tighten the nuts in a crisscross pattern in 2-3 steps, starting with the inner nuts. Be sure all hoses and wires are correctly connected. Start the engine and check for leaks.
  14.  

 
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