Sentra 1998

Cylinder Head

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Removal & Installation



1.6L Engine

Specific to:

Nissan Sentra 1997-1999

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

    Negative battery cable
     
    Engine drive belts
     
    Power steering pulley
     
    Oil pump and bracket
     
    Air duct to the intake manifold collector
     
    Right front wheel
     
    Engine side and under covers
     
    Front exhaust tube
     
    Cylinder head front mounting bracket
     
    Valve cover by loosening the bolts in numerical order
     
    Distributor, plug wires and spark plugs
     
    Spark plugs
     
    Intake manifold support and set the No. 1 cylinder at the Top Dead Center (TDC) position
     
    Idler pulley, camshaft sprockets and timing chains
     
    Camshafts
     

  8.  
  9. Loosen the cylinder head bolts in 2-3 steps in the reverse order of the tightening sequence to prevent warpage or cracking of the cylinder head assembly.

    Cylinder head (carefully), from the block, pulling the head up evenly from both ends. If the head seems stuck, do not pry it off. Tap lightly around the lower perimeter of the head with a rubber mallet to help break the seal. The cylinder head and the intake and exhaust manifolds are removed together.
     
    Cylinder head gasket(s)
     

  10.  

To install:

  1. Thoroughly clean both the cylinder block and head mating surfaces. Avoid scratching either surface.
  2.  
  3. Coat the threads and the seating surface of the head bolts with clean engine oil. Install the cylinder head assembly (always replace the head gasket). Install head bolts (with washers) in their proper locations.
  4.  
  5. Tighten the bolts in sequence, as follows:
    1. Step 1: Bolts 1-10 to 22 ft. lbs. (29 Nm).
    2.  
    3. Step 2: Bolts 1-10 to 43 ft. lbs. (59 Nm).
    4.  
    5. Step 3: Loosen bolts 1-10 completely.
    6.  
    7. Step 4: Bolts 1-10 to 22 ft. lbs. (29 Nm).
    8.  
    9. Step 5: Bolts 1-10 plus 50-55 degrees.
    10.  
    11. Step 5: Bolts 11-15 to 74 inch lbs. (8 Nm).

      Click image to see an enlarged view

      Fig. Cylinder head torque sequence

    12.  


      Click image to see an enlarged view

      Fig. Tighten the valve cover bolts in sequence


  6.  
  7. Install or connect the following:

    Camshafts
     
    Idler pulley, camshaft sprockets and timing chains
     
    Intake manifold support
     
    Distributor
     
    Spark plugs and wires
     
    Distributor cap
     
    Rocker arm cover and torque the bolts to 34 inch lbs. (4 Nm)
     
    Cylinder head front mounting bracket
     
    Front exhaust tube
     
    Engine side and under covers
     
    Right front wheel
     
    Air duct to the intake manifold collector
     
    Oil pump and bracket
     
    Power steering pulley
     
    Drive belts
     
    Negative battery cable
     

  8.  
  9. Fill the cooling system.
  10.  
  11. Start the vehicle, check for leaks and repair if necessary.
  12.  

2.0L Engine

Specific to:

Nissan Sentra 1997-2001

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

    Negative battery cable
     
    Engine under covers
     
    Right front wheel and engine side cover
     
    Radiator assembly
     
    Air duct and intake manifold
     
    Drive belts and water pump pulley
     
    Alternator
     
    Power steering pump
     
    Cylinder head cover and oil separator
     
    Oil filter and power steering pump brackets
     
    Front exhaust pipe from the exhaust manifold
     
    Distributor assembly
     
    Timing chain, tensioner, chain guide and camshaft sprockets
     
    Camshafts
     
    Water hose from the cylinder block and water hose from the heater
     
    Starter motor
     
    Water pipe bolt
     
    Knock Sensor (KS) harness connector and the Exhaust Gas Recirculation (EGR) tube
     
    Cylinder outside bolts. Remove the cylinder head bolts in 2 or 3 steps.
     
    Cylinder head completely with manifolds attached
     

  8.  

To install:

  1. Check all components for wear. Replace as necessary. Clean all mating surfaces and replace the cylinder head gasket.
    NOTE
    If the length of any cylinder head bolt exceeds 6.22 in. (158.2mm), replace the bolt.

  2.  
  3. Install cylinder head. Torque the cylinder head bolts in the following sequence:
    1. Step 1: 29 ft. lbs. (39 Nm).
    2.  
    3. Step 2: 58 ft. lbs. (78 Nm).
    4.  
    5. Step 3: Loosen all bolts in sequence completely.
    6.  
    7. Step 4: 25-33 ft. lbs. (34-44 Nm).
    8.  
    9. Step 5: Plus 90-95 degrees clockwise in sequence.
    10.  
    11. Step 6: Plus additional 90-95 degrees.
      NOTE
      Do not turn any bolt 180-200 degrees clockwise all at once.



      Click image to see an enlarged view

      Fig. Cylinder head bolt torque sequence-2.0L engine



      Click image to see an enlarged view

      Fig. Tighten the valve cover bolts in sequence-2.0L engines

    12.  

  4.  
  5. Install or connect the following:

    KS connector and EGR tube
     
    Starter motor and the wiring
     
    Water hoses to the engine block and heater
     
    Camshafts
     
    Camshaft sprockets timing chain guide, tensioner and timing chain
     
    Distributor assembly
     
    Front exhaust pipe to the exhaust manifold
     
    Oil filter and power steering pump brackets
     
    Cylinder head cover and oil separator
     
    Power steering pump
     
    Alternator
     
    Drive belts
     
    Air duct and intake manifold
     
    Radiator
     
    Engine side cover and right front wheel
     
    Engine under covers
     
    Negative battery cable
     

  6.  
  7. Fill the cooling system.
  8.  
  9. Start the vehicle, check for leaks and repair if necessary.
  10.  

 
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