Nissan 240SX/Altima 1993-1998 Repair Guide

Cylinder Head

Print

REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4 and 5



Click image to see an enlarged view

Fig. Fig. 1: Cylinder head bolt loosening sequence



Click image to see an enlarged view

Fig. Fig. 2: Lubricate the cylinder head bolts prior to installation; this will provide a more accurate torque reading



Click image to see an enlarged view

Fig. Fig. 3: Install the cylinder head bolt washer with the chamfer facing up



Click image to see an enlarged view

Fig. Fig. 4: Always tighten cylinder head bolts in the specified sequence, to the specified torque



Click image to see an enlarged view

Fig. Fig. 5: Cylinder head bolt tightening sequence

Altima

See Figures 6, 7, 8, 9, 10, 11, 12 and 13



Click image to see an enlarged view

Fig. Fig. 6: One of the intake manifold braces is located on the driver's side of the engine compartment, and must be removed from beneath the vehicle



Click image to see an enlarged view

Fig. Fig. 7: The second intake manifold brace can be accessed just below the throttle body. The arrows indicate the location of the mounting bolts



Click image to see an enlarged view

Fig. Fig. 8: The bracket which surrounds the passenger's side of the cylinder head must be removed prior to removing the cylinder head



Click image to see an enlarged view

Fig. Fig. 9: The distributor is removed by loosening the two attaching bolts and pulling the unit straight out of the cylinder head



Click image to see an enlarged view

Fig. Fig. 10: Although the cylinder head and intake manifold are made of aluminum, it still takes two people to lift the assembly off the engine block



Click image to see an enlarged view

Fig. Fig. 11: Carefully inspect the cylinder head gasket for signs of damage. A leaking head gasket can cause major engine problems



Click image to see an enlarged view

Fig. Fig. 12: Thoroughly clean the engine block and cylinder head gasket mating surfaces



Click image to see an enlarged view

Fig. Fig. 13: When the dot on the distributor tang and the slit on the collar are aligned, the rotor is positioned at distributor cap terminal No. 1

  1. Disconnect the negative battery cable.
  2.  
  3. Drain and recycle the engine coolant.
  4.  
  5. Drain and recycle the engine oil.
  6.  
  7. Properly relieve the fuel system pressure.
  8.  
  9. Disconnect the air duct from the throttle body.
  10.  
  11. Disconnect the intake manifold braces from the rear of the engine.
  12.  
  13. Remove the exhaust manifold.
  14.  
  15. Remove the alternator and all related brackets.
  16.  
  17. Remove the distributor assembly.
  18.  
  19. Using a block of wood, set a jack under the aluminum oil pan and remove the passenger's side engine mount.
  20.  
  21. Remove the cylinder head cover.
  22.  
  23. Remove the timing chain and camshaft sprockets.
  24.  

The lower timing chain should not be disengaged from the crankshaft sprocket.

  1. Remove the camshafts.
  2.  

The valve train components must be reassembled in their original positions. Be sure to note their locations.

  1. Loosen the cylinder head bolts in the illustrated order.
  2.  

A warped or cracked cylinder head could result from loosening in incorrect order. The cylinder head bolts should be loosened in two or three steps.

  1. Remove the cylinder head and intake manifold as an assembly.
  2.  
  3. Remove the cylinder head gasket.
  4.  

To install:
  1. Clean the gasket mating surfaces thoroughly.
  2.  
  3. Inspect both the engine block and cylinder head for damage. Refer to ENGINE RECONDITIONING for further information.
  4.  
  5. Install a new cylinder head gasket. Ensure that the proper side of the gasket is facing up. Each gasket manufacturer will have a slightly different way of telling which side is up. Read the manufacturer's instructions carefully.
  6.  
  7. Install the cylinder head and temporarily tighten the cylinder head bolts. This is necessary to avoid damaging the cylinder head gasket. Be sure to install washers between the bolts and cylinder head.
  8.  
  9. Install the upper timing chain and cover.
  10.  
  11. Tighten the cylinder head bolts in the proper sequence to the following torque specifications:
    1. Tighten all the bolts to 22 ft. lbs. (29 Nm).
    2.  
    3. Tighten all the bolts to 10 ft. lbs. (79 Nm).
    4.  
    5. Loosen all the bolts completely.
    6.  
    7. Tighten all the bolts to 18-25 ft. lbs. (25-34 Nm).
    8.  
    9. Turn all the bolts 86-91 degrees clockwise.If an angle wrench is not available, tighten all the bolts to 6-13 ft. lbs. (75-84 Nm).
    10.  

  12.  
  13. Install the camshafts.
  14.  
  15. Install the timing chain and sprockets.
  16.  
  17. Install the cylinder head cover.
  18.  
  19. Install the passenger's side engine mount and lower the engine.
  20.  
  21. Install the distributor assembly.
  22.  
  23. Install the alternator and all related brackets.
  24.  
  25. Install the exhaust manifold.
  26.  
  27. Install the intake manifold braces.
  28.  
  29. Connect the air duct to the throttle body.
  30.  
  31. Refill and bleed the cooling system.
  32.  
  33. Refill the engine with the proper grade and viscosity of engine oil.
  34.  
  35. Connect the negative battery cable.
  36.  
  37. Start the engine and make the necessary adjustments.
  38.  
  39. Check for proper operation and leaks.
  40.  

240SX
  1. Disconnect the negative battery cable.
  2.  
  3. Drain and recycle the engine coolant.
  4.  
  5. Drain and recycle the engine oil.
  6.  
  7. Properly relieve the fuel system pressure.
  8.  
  9. Disconnect the air duct from the throttle body.
  10.  
  11. Remove the power steering pump and alternator, as necessary.
  12.  
  13. Disconnect the intake manifold braces.
  14.  
  15. Remove the intake manifold.
  16.  
  17. Remove the exhaust manifold.
  18.  
  19. Remove the distributor assembly.
  20.  
  21. Remove the cylinder head cover.
  22.  
  23. Remove the timing chain and camshaft sprockets.
  24.  

The lower timing chain should not be disengaged from the crankshaft sprocket.

  1. Remove the camshafts.
  2.  

The valve train components must be reassembled in their original positions. Be sure to note their locations.

  1. Loosen the cylinder head bolts in the illustrated order.
  2.  

A warped or cracked cylinder head could result from loosening in incorrect order. The cylinder head bolts should be loosened in two or three steps.

  1. Remove the cylinder head and intake manifold as an assembly.
  2.  
  3. Remove the cylinder head gasket.
  4.  

To install:
  1. Clean the gasket mating surfaces thoroughly.
  2.  
  3. Inspect both the engine block and cylinder head for damage. Refer to ENGINE RECONDITIONING for further information.
  4.  
  5. Install a new cylinder head gasket. Ensure that the proper side of the gasket is facing up. Each gasket manufacturer will have a slightly different way of telling which side is up. Read the manufacturer's instructions carefully.
  6.  
  7. Install the cylinder head and temporarily tighten the cylinder head bolts. This is necessary to avoid damaging the cylinder head gasket. Be sure to install washers between the bolts and cylinder head.
  8.  
  9. Install the upper timing chain and cover.
  10.  
  11. Tighten the cylinder head bolts in the proper sequence to the following torque specifications:
    1. Tighten all the bolts to 22 ft. lbs. (29 Nm).
    2.  
    3. Tighten all the bolts to 10 ft. lbs. (79 Nm).
    4.  
    5. Loosen all the bolts completely.
    6.  
    7. Tighten all the bolts to 18-25 ft. lbs.(25-34 Nm).
    8.  
    9. Turn all the bolts 86-91 degrees clockwise.If an angle wrench is not available, tighten all the bolts to 6-13 ft. lbs. (75-84 Nm).
    10.  

  12.  
  13. Install the timing chain and camshaft sprockets.
  14.  
  15. Install the cylinder head cover.
  16.  
  17. Install the distributor assembly.
  18.  
  19. Install the exhaust manifold.
  20.  
  21. Install the intake manifold.
  22.  
  23. Connect the intake manifold braces.
  24.  
  25. Install the power steering pump and alternator, if removed.
  26.  
  27. Connect the air duct to the throttle body.
  28.  
  29. Refill and bleed the cooling system.
  30.  
  31. Refill the engine with the proper grade and viscosity of engine oil.
  32.  
  33. Connect the negative battery cable.
  34.  
  35. Start the engine and make the necessary adjustments.
  36.  
  37. Check for proper operation and leaks.
  38.  

 
label.common.footer.alt.autozoneLogo