Sentra 1998

Intake Manifold

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Removal & Installation



1.6L Engine

Specific to:

Nissan Sentra 1997-2006

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Air cleaner assembly
     
    Throttle linkage, electrical connections and vacuum lines from the throttle body
     
    Intake manifold collector support brackets
     

  8.  
  9. The throttle body can be removed from the manifold at this point or can be removed as an assembly with the intake manifold.

    Bolts holding the upper portion of the intake to the lower portion. Remove the bolts in reverse order of the tightening sequence.
     
    Upper portion of the intake
     
    Fuel injector wiring harness connectors and the vacuum line from the fuel pressure regulator
     
    Fuel hoses from the fuel rail assembly
     
    Bolts that secure the fuel rail to the intake
     
    Injectors with the fuel rail assembly
     
    Intake manifold retaining bolts in the proper sequence and separate the manifold from the cylinder head. Remove the bolts in reverse order of the tightening sequence.
     
    Intake manifold gasket and clean all the gasket contact surfaces thoroughly with a gasket scraper and suitable solvent. All traces of old gasket material must be removed to ensure proper sealing.
     
    Inspect the intake manifold for cracks. Using a metal straight-edge, check the surface of the intake manifold for warpage.
     

  10.  

To install:

  1. Install or connect the following:
    NOTE
    Be sure to properly position the throttle body gasket with the cut out facing down.



    New intake manifold gasket onto the cylinder head and position the lower intake manifold over the mounting studs and onto the gasket.
     
    Intake manifold and torque the bolts to 13-15 ft. lbs. (18-21 Nm) in sequence
     
    Injectors with the fuel rail assembly. Be sure to install the fuel rail insulators. Torque the bolts in 2 steps to 13-15 ft. lbs. (18-21 Nm).

    Click image to see an enlarged view

    Fig. Lower intake manifold torque sequence



    Click image to see an enlarged view

    Fig. Upper intake manifold torque sequence

     
    Fuel injector wiring harness connectors and the vacuum line to the fuel pressure regulator
     
    Fuel hoses to the fuel rail assembly using new hose clamps
     
    Intake manifold collector using a new gasket. Torque the bolts to 13-15 ft. lbs. (18-21 Nm) in sequence.
     
    Throttle body or throttle chamber, if removed. Torque the bolts in a crisscross pattern to 13-16 ft. lbs. (18-22 Nm).
     



    Intake manifold collector support brackets
     
    Throttle linkage, electrical connections and vacuum lines
     
    Air cleaner
     
    Negative battery cable
     

  2.  
  3. Fill the cooling system to the proper level.
  4.  
  5. Start the engine, check for leaks and repair if necessary.
  6.  

2.0L Engine

Specific to:

Nissan Sentra 1997-2001

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Air cleaner assembly
     
    Manifold support brackets
     
    Throttle linkage, electrical connections and vacuum lines from the throttle body. Be sure to note the locations of all connections.
     
    Exhaust Gas Recirculation (EGR) tube from the manifold
     
    Fuel rail assembly
     
    Drive belts and water pump pulley
     
    Alternator and power steering pump
     
    Oil filter bracket and power steering bracket
     
    Intake manifold collector retaining bolts in the reverse of installation sequence and separate the collector from the manifold
     
    Intake manifold assembly retaining bolts in the reverse order of the tightening sequence and separate the manifold from the cylinder head
     
    All gasket material and clean all the gasket contact surfaces thoroughly with a gasket scraper and a suitable solvent. All traces of old gasket material must be removed to ensure proper sealing.
     
    Inspect the intake manifold for cracks. Using a metal straightedge, check the surface of the intake manifold for warpage.
     

  8.  

To install:

Click image to see an enlarged view

Fig. Lower intake manifold torque sequence-2.0L engine



Click image to see an enlarged view

Fig. Upper intake manifold torque sequence-2.0L and 1.8L engines

  1. Install or connect the following:

    Intake manifold with new gaskets and torque the bolts, in sequence, to 13-15 ft. lbs. (18-21 Nm)
     
    Intake manifold collector with new gaskets and torque the bolts, in sequence, to 13-15 ft. lbs. (18-21 Nm)
     
    Oil filter bracket
     
    Power steering bracket
     
    Alternator and power steering pump
     
    Water pump pulley and drive belts
     
    Fuel rail assembly with new insulators and torque the bolts to 35 inch lbs. (4 Nm)
     
    EGR tube
     
    Throttle linkage, vacuum lines and electrical connections to the throttle body
     
    Manifold support brackets with new gaskets and torque the bolts to 20 ft. lbs. (26 Nm)
     
    Air cleaner assembly
     
    Negative battery cable
     

  2.  
  3. Fill the cooling system to the proper level.
  4.  
  5. Start the vehicle, check for leaks and repair if necessary.
  6.  

 
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