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    1720 S RIDGEWOOD A
    (386) 427-1210

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    Mercury Villager Nissan Quest 1997-2000

    Cylinder Head

    Print

    REMOVAL & INSTALLATION

    The factory specifies that the cylinder head bolts ARE NOT to be reused. Obtain the proper replacement parts before beginning this procedure. Check carefully that all bolts are removed before attempting to remove a cylinder head. A tab, part of the head, contains one head bolt that is external to the rocker arm cover. Do not overlook this "hidden" bolt or the head will be damaged.



    Click image to see an enlarged view

    Fig. Exploded view of the cylinder head assembly

    1993-98 3.0L Engines
    1. Remove the timing belt.
    2.  
    3. Remove the distributor.
    4.  
    5. Remove the lower intake manifold.
    6.  
    7. Label and remove the following electrical connectors:
    8.  
    9. Vehicle speed sensor (VSS)
    10.  
    11. Valve body wiring harness
    12.  
    13. Transaxle range (TR) switch
    14.  
    15. A/C clutch pulley
    16.  
    17. A/C cut-off switch
    18.  
    19. Ignition coil
    20.  
    21. Remove the main wiring harness bracket from the thermostat water inlet.
    22.  
    23. Remove the fuel tube bracket bolt from the EGR valve bracket.
    24.  


    WARNING
    Do not rotate the crankshaft or camshafts with the timing belt removed. Damage to the valves and/or pistons may result.

    1. Remove the camshaft sprockets.
    2.  
    3. Remove the four timing belt rear cover bolts from the cylinder heads and remove the cover.
    4.  
    5. If removing the left cylinder head, remove the oil dipstick tube bolts and remove the bracket.
    6.  
    7. Raise and safely support the front of the vehicle securely on jackstands.
    8.  
    9. If removing the left cylinder head, remove the three exhaust manifold-to-inlet pipe nuts. Remove and discard the gasket.
    10.  
    11. Remove the left exhaust manifold-to-mounting bracket bolt.
    12.  
    13. If removing the left cylinder head, remove the two lower A/C compressor bolts.
    14.  
    15. Lower the vehicle.
    16.  
    17. If removing the left cylinder head, loosen the two upper A/C compressor bolts and move the A/C compressor out of the way. Secure the compressor with wire. Note that the upper A/C compressor bolts are too long to remove from the compressor. Remove them once the compressor is moved aside.
    18.  
    19. If removing the left cylinder head, remove the two upper alternator mounting bracket bolts and the two coolant crossover tube bracket bolts.
    20.  
    21. If removing the left cylinder head, remove the two coolant crossover tube bracket bolts.
    22.  
    23. If removing the right cylinder head, remove the right exhaust manifold. Please refer to Exhaust Manifold, Removal and Installation for the proper loosening sequence.
    24.  


    NOTE
    Please note that there is a "tab" on one end of each cylinder head. This tab contains a head bolt. Be sure that this is the first bolt in the removal sequence. This bolt is easily forgotten or overlooked and the tab can be broken off if the cylinder head is moved prior to the bolt being removed. Also, note that the head bolts are not to be reused.

    1. Loosen the head bolts in sequence, in two steps. Remove the head bolt washers and discard the head bolts.
    2.  
    3. Remove the right cylinder head, and the left cylinder head and exhaust manifold assembly, and discard the gaskets.
    4.  
    5. If removing the left exhaust manifold from the left cylinder head, please refer to Exhaust Manifold, Removal and Installation for the proper loosening sequence.
    6.  

    To install:

    1. The installation is the reverse of removal, but please note the following important steps.
    2.  
    3. The cylinder heads should be cleaned and inspected before installation. Please refer to Engine Reconditioning, Cylinder Head for the procedure.
    4.  
    5. Use all new gaskets.
    6.  
    7. Note that the head bolt washers have a chamfer or bevel on one side. The beveled side should face up when installed. Examine the new replacement head bolts. There are different lengths. The head bolts in positions 4, 5, 12 and 13 are 5.00 inches (127mm) long and the rest are 4.17 inches (106mm) long. Be sure the new cylinder head bolts are installed in the correct positions. When installing the cylinder head, tighten the new head bolts in the following sequence:
    8.  
      1. Tighten all head bolts, in sequence, to 22 ft. lbs. (29 Nm).
      2.  
      3. Tighten all head bolts, in sequence, to 43 ft. lbs. (59 Nm).
      4.  
      5. Loosen all of the bolts completely, following the loosening sequence.
      6.  
      7. Tighten the head bolts again, in sequence, to 22 ft. lbs. (29 Nm).
      8.  
      9. If using a torque angle meter, tighten all cylinder head bolts, in sequence, 60-65° clockwise. If a torque angle meter is not available, tighten the head bolts, in sequence, to 40-47 ft. lbs. (54-64 Nm).
      10.  
      11. Finally, install the head bolt located in the tab, and tighten it to 72 inch lbs. (8 Nm).
      12.  

    9. When installing the exhaust manifolds, refer to Exhaust Manifold, Removal and Installation for the torque and tightening sequence.
    10.  
    11. When installing the A/C compressor bolts, tighten them to 33-44 ft. lbs. (45-60 Nm).
    12.  
    13. When installing the exhaust inlet pipe, tighten the nuts to 32-40 ft. lbs. (44-54 Nm).
    14.  
    15. When installing the rear timing belt cover, tighten the bolts to 27-44 inch lbs. (3-5 Nm).
    16.  
    17. When installing the fuel rail bolts, tighten them to 17-20 ft. lbs. (24-27 Nm).
    18.  
    19. After installation, fill the cooling system. An oil and filter change is recommended.
    20.  
    21. Run the engine and check for leaks.
    22.  
    23. Check the ignition timing and adjust, if needed.
    24.  



    Click image to see an enlarged view

    Fig. Cylinder head bolt loosening sequence-1993-98 3.0L engines



    Click image to see an enlarged view

    Fig. Cylinder head bolt tightening sequence-1993-98 3.0L enginesThe "hidden" bolt is indicated as "A"

    1999-00 3.3L Engines
    1. Remove the lower intake manifold.
    2.  
    3. Remove the timing belt.
    4.  
    5. Remove the distributor.
    6.  
    7. Disconnect the A/C compressor electrical connectors and position the wiring harness aside.
    8.  
    9. Remove the spark plugs.
    10.  
    11. Raise and safely support the front of the vehicle securely on jackstands.
    12.  
    13. Remove the engine and transaxle inner splash shield.
    14.  
    15. If removing the left cylinder head, remove the radiator.
    16.  
    17. Remove the bolt from the transaxle dipstick tube and position the tube aside.
    18.  
    19. Remove the three exhaust manifold heat shield bolts and remove the shield.
    20.  
    21. Remove the three left exhaust manifold-to-right exhaust manifold nuts.
    22.  
    23. If removing the left cylinder head, remove the two exhaust manifold-to-inlet pipe nuts.
    24.  
    25. Lower the vehicle.
    26.  
    27. If removing the left cylinder head, remove the three left exhaust manifold heat shield bolts, position the engine oil dipstick tube aside, and remove the heat shield.
    28.  


    WARNING
    Do not rotate the crankshaft or camshafts with the timing belt removed. Damage to the valves and/or pistons may result.

    1. Remove both camshaft sprockets. A special tool is recommended to hold the camshaft sprockets in position while removing the sprocket bolts, however, if the special tool is not available, use the following procedure. Wrap a rag around the outer edge of the sprocket. Grip the rag and sprocket with a large pair of water pump pliers, being careful not to damage the sprocket. Remove the sprocket bolt.
    2.  
    3. Remove the four timing belt rear cover bolts from the cylinder heads and remove the cover.
    4.  
    5. Remove the two right exhaust manifold-to-engine lifting eye bracket bolts and remove the bracket.
    6.  
    7. Disconnect the heater core hose from the coolant crossover tube.
    8.  
    9. Remove the four bolts from the coolant crossover tube and remove the tube and lower radiator hose.
    10.  
    11. If removing the left cylinder head:
    12.  
    13. Remove the four A/C compressor bolts and position it aside, securing it with wire.
    14.  
    15. Remove the two A/C compressor mounting bracket bolts.
    16.  
    17. Remove the left exhaust manifold.
    18.  
    19. If removing the right cylinder head:
    20.  
    21. Disconnect the vacuum hoses and electrical connectors from the bracket on the head and position them aside.
    22.  
    23. Unclip the wiring harness from the rocker arm cover and position it aside.
    24.  
    25. Disconnect the vacuum hoses from the rocker arm cover.
    26.  
    27. Remove the bolt from the upper intake manifold stabilizer bracket and remove the bracket.
    28.  
    29. Remove the rocker arm cover of the head that is to be removed.
    30.  
    31. Remove the rocker arm shafts and rocker arms.
    32.  
    33. Remove the rocker arm shaft supports and lifters.
    34.  


    NOTE
    Please note that there is a "tab" on one end of each cylinder head. This tab contains a head bolt. Be sure that this is the first bolt in the removal sequence. This bolt is easily forgotten or overlooked and the tab can be broken off if the cylinder head is moved prior to the bolt being removed. Also, note that the head bolts are not to be reused.

    1. Loosen the head bolts in sequence, in two steps. Remove the head bolt washers and discard the head bolts.
    2.  
    3. Remove the right cylinder head and exhaust manifold assembly, and the left cylinder head, and discard the gaskets.
    4.  
    5. If removing the right exhaust manifold from the right cylinder head, please refer to Exhaust Manifold, Removal and Installation for the proper loosening sequence.
    6.  

    To install:

    1. The installation is the reverse of removal, but please note the following important steps.
    2.  
    3. The cylinder heads should be cleaned and inspected before installation. Please refer to Engine Reconditioning, Cylinder Head for the procedure.
    4.  
    5. Use all new gaskets.
    6.  
    7. Note that the head bolt washers have a chamfer or bevel on one side. The beveled side should face up when installed. Examine the new replacement head bolts. There are different lengths. The head bolts in positions 4, 7, 9 and 12 are 5.00 inches (127mm) long and the rest are 4.17 inches (106mm) long. Be sure the new cylinder head bolts are installed in the correct positions. When installing the cylinder heads, the cylinder head bolts and the lower intake manifold bolts and nuts must be tightened in the following order:
    8.  
      1. Tighten all head bolts, in sequence, to 21 ft. lbs. (29 Nm).
      2.  
      3. Tighten all head bolts, in sequence, to 44 ft. lbs. (59 Nm).
      4.  
      5. Loosen all of the bolts completely, following the loosening sequence.
      6.  
      7. Tighten all head bolts, in sequence to 89 inch lbs. (10 Nm).
      8.  
      9. Install the coolant crossover tube. Tighten the thermostat housing mounting bolts to 18 ft. lbs. (24 Nm). Tighten the crossover tube bracket bolts to 15 ft. lbs. (21 Nm).
      10.  
      11. Position the new lower intake manifold gaskets on the cylinder heads.
      12.  
      13. Position the lower intake manifold on the engine.
      14.  
      15. Install the bolts and nuts, and tighten them in sequence to 35 inch lbs. (4 Nm).
      16.  
      17. Continue tightening the lower intake manifold bolts and nuts, in sequence, to 13 ft. lbs. (18 Nm).
      18.  
      19. Retighten the lower intake manifold bolts and nuts, in sequence, to 13 ft. lbs. (18 Nm).
      20.  
      21. Loosen all of the lower intake manifold bolts and nuts in the reverse order of the tightening sequence.
      22.  
      23. Tighten all head bolts, in sequence, to 21 ft. lbs. (29 Nm).
      24.  
      25. Tighten all head bolts, in sequence, to 44 ft. lbs. (59 Nm).
      26.  
      27. Install the "tab" head bolt, and tighten it to 89 inch lbs. (10 Nm).
      28.  
      29. Tighten the lower intake manifold bolts and nuts, in sequence, to 35 inch lbs. (4 Nm).
      30.  
      31. Continue tightening the lower intake manifold bolts and nuts, in sequence, to 80 inch lbs. (9 Nm).
      32.  
      33. Retighten the lower intake manifold bolts and nuts, in sequence, to 80 inch lbs. (9 Nm).
      34.  

    9. When installing the exhaust manifolds, refer to Exhaust Manifold, Removal and Installation for the torque and tightening sequence.
    10.  
    11. When installing the A/C compressor mounting bracket bolts, tighten them to 32-43 ft. lbs. (43-58 Nm).
    12.  
    13. When installing the A/C compressor bolts, tighten them to 13-22 ft. lbs. (22-29 Nm).
    14.  
    15. When installing the exhaust inlet pipe, tighten the nuts to 44-52 ft. lbs. (60-70 Nm).
    16.  
    17. When installing the rear timing belt cover, tighten the bolts to 26-43 inch lbs. (3-5 Nm).
    18.  
    19. When installing the fuel rail bolts, tighten them to 8-11 ft. lbs. (11-15 Nm).
    20.  
    21. After installation, fill the cooling system. An oil and filter change is recommended.
    22.  
    23. Run the engine and check for leaks.
    24.  
    25. Check the ignition timing and adjust, if needed.
    26.  



    Click image to see an enlarged view

    Fig. Cylinder head bolt loosening sequence-1999-00 3.3L engines



    Click image to see an enlarged view

    Fig. Cylinder head bolt tightening sequence-1999-00 3.3L engines

     
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