Lexus Car ES, IS, LS 1998-06

Timing Chain & Sprockets 2

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Removal & Installation



3mz-FE Engine


Click image to see an enlarged view

Fig. Exploded view Intake Manifold-3.3L (3MZ-FE) Engine

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Align the camshaft pulleys so that they can be returned to the original locations when reassembling.


    WARNING
    Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being removed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break.



    Negative battery cable. Wait at least 90 seconds before performing any other work
     
    RH front wheel
     
    Front suspension upper brace center
     
    V-bank cover sub-assembly
     
    Air cleaner assembly
     
    Emission control valve set
     
    Intake air surge tank
     
    Ignition coil assembly
     
    Cylinder head valve covers
     
    Front fender apron seal
     
    A/C Compressor and PS drive belts
     
    Engine stabilizing rod
     
    Engine mounting stay
     
    Alternator bracket
     
    Crankshaft pulley
     
    Timing belt covers
     
    Timing belt, tensioners, idlers and guides
     
    Camshaft timing pulleys
     



    Inner timing belt cover
     

  4.  
  5. Remove the camshaft using the following procedures
  6.  
  7. RH bank camshaft No.1 & LH bank camshaft No.2
    1. Align the (2 dot marks) of the camshaft drive and driven gear by turning the camshaft with a wrench.

      Click image to see an enlarged view

      Fig. Aligning timing marks-3.3L (3MZ-FE) Engine

    2.  
    3. Secure the exhaust camshaft sub gear to the main gear with service bolt. Torque to 48 inch lbs. (5.4 Nm)
      NOTE
      When removing the camshaft, make certain that the torsional spring force of the sub gear has been eliminated by installation of the service bolt.

    4.  
    5. Using several steps, loosen the 10 bearing cap bolts uniformly in the sequence shown in the illustration. Remove the 5 bearing caps and camshaft
      WARNING
      Do Not pry out camshaft


      WARNING
      Do Not damage contact surface of the cylinder head that receives the shaft thrust.



      Click image to see an enlarged view

      Fig. Camshaft bolt removal sequence Camshaft No.1-3.3L (3MZ-FE) Engine



      Click image to see an enlarged view

      Fig. Camshaft bolt removal sequence Camshaft No.2 -3.3L (3MZ-FE) Engine



      Click image to see an enlarged view

      Fig. Camshaft bolt removal sequence Camshaft No.4 -3.3L (3MZ-FE) Engine

    6.  

  8.  
  9. LH bank camshaft No. 3 & No. 4
    1. Using several steps, loosen the 10 bearing cap bolts uniformly in the sequence shown in the illustration. Remove the 5 bearing caps and camshaft
      WARNING
      Do Not pry out camshaft


      WARNING
      Do Not damage contact surface of the cylinder head that receives the shaft thrust.



      Click image to see an enlarged view

      Fig. Camshaft bolt removal sequence Camshaft No. 3-3.3L (3MZ-FE) Engine



      Click image to see an enlarged view

      Fig. Camshaft bolt removal sequence Camshaft No. 4-3.3L (3MZ-FE) Engine

    2.  
    3. Remove the oil seal from camshaft
    4.  

  10.  

To install:

  1. Install RH No 2 Camshaft then RH Camshaft No. 1 using same procedure
    WARNING
    Since the clearance of the camshaft is small, the camshaft must be kept level while bring installed. If the camshaft is not kept level, the cylinder head or camshaft may be damaged.

    1. Apply engine oil to the thrust portion and journal of camshaft
    2.  
    3. No. 2 camshaft at 90 degree angel to the timing mark (2 dot marks) on the head.
    4.  
    5. Multi-purpose grease to new oil seal
    6.  
    7. Oil seal to camshaft
      NOTE
      Do NOT turn over the oil seal lip


      NOTE
      Insert oil seal until it stops

    8.  
    9. Seal packing to bearing cap No. 1
      NOTE
      Install bearing cap No. 1 within 5 minutes after applying seal packing


      NOTE
      Do NOT expose seal packing to engine oil within 2 hours after installation

    10.  
    11. 5 bearing caps in their proper locations
    12.  
    13. Apply light coat of oil to the threads of the bearing caps
    14.  
    15. Tighten the 10 bearing cap bolts in required sequence. Torque to: 12 ft. lbs. (16 Nm)
    16.  

  2.  
  3. Install LH camshaft No.3 and LH camshaft No. 4 using the above procedure

    Click image to see an enlarged view

    Fig. Bolt torque procedure RH camshaft No. 2-3.3L (3MZ-FE) Engine



    Click image to see an enlarged view

    Fig. Bolt torque procedure RH camshaft No. 1-3.3L (3MZ-FE) Engine



    Click image to see an enlarged view

    Fig. Bolt torque procedure LH camshaft No. 3-3.3L (3MZ-FE) Engine



    Click image to see an enlarged view

    Fig. Bolt torque procedure LH camshaft No. 4-3.3L (3MZ-FE) Engine

  4.  
  5. Install or connect the following:

    Inner timing belt cover
     
    RH then LH camshaft timing pulleys. Torque to: 92 ft. lbs. (125 Nm)
     
    Timing belt idlers, tensioners, guide and belt
     
    RH engine mounting bracket
     
    Timing belt covers
     
    Crankshaft pulley
     
    Alternator bracket
     
    RH engine mounting stay
     
    Engine stabilizing rod
     
    Inspect or adjust valve lash
     
    A/C compressor and PS drive belts
     
    Cylinder head valve covers
     
    Ignition coil assembly
     
    Intake air surge tank
     
    Emission control valve set
     
    Air cleaner assembly
     
    Vacuum hoses
     
    V-bank cover sub-assembly
     
    Front suspension upper center brace
     
    RF wheel
     
    Engine coolant. Check for leaks
     
    System initialization
     

  6.  

3uz-FE Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel pressure from the fuel lines.
  4.  
  5. Remove or disconnect the following:
    WARNING
    Do NOT drop anything inside timing belt cover during this procedure. Keep oil, water and dust from timing belt.


    WARNING
    Since the thrust clearance of the camshaft is small, the camshaft must be kept level during removal steps. If it is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to later seize or break. Follow the procedure carefully to avoid this damage.



    Engine under cover
     
    Drain engine coolant and engine oil
     
    V-bank cover
     
    Air cleaner assembly
     
    Intake air pipe
     
    Radiator
     
    Throttle body
     
    Upper and lower intake manifold assembly
     
    Timing belt from camshaft pulleys
     
    Camshaft position sensor and LH timing belt rear plates
     
    RH timing belt rear plates
     



    Power steering pump from engine mount (Do NOT disconnect hoses)
     
    Catalytic converters
     
    Water inlet housing assembly
     
    Water bypass pipe, front bypass joint, and rear bypass joint
     
    Ignition coils
     
    Variable valve timing (VVT) sensors
     
    Engine hangers
     
    Oil dipsticks and guides for engine oil and transmission fluid
     
    Cylinder head covers
     
    Spark plugs
     
    Semi-circular plugs and camshaft housing plugs
     
    Camshaft timing oil control valve
     

  6.  
  7. Check the crankshaft pulley position and ensure the timing mark of the pulley is aligned with the centers of the crankshaft pulley bolt and the No. 2 timing belt idler pulley bolt.
    WARNING
    Having the crankshaft pulley at the wrong angle can cause the piston head and valve head to come into contact with each other during camshaft removal. Always set the crankshaft pulley at the described angle.

  8.  
  9. Using a special wrench, rotate the camshaft timing tube from left to right about 2-3 times, within only a 25°range of movement. Use a waste cloth to collect oil from the camshaft timing oil control valve installation hole.
  10.  
  11. Remove the LH camshafts first. With a hex wrench on the hex portion of the camshaft, rotate so that a 6mm service bolt can be inserted into the bolt hole in the rear face of the camshaft pulley into order to secure the camshaft in place. The bolt should be about 0.63-0.79 inch (16-20mm) long.
  12.  
  13. Align the timing mark (2 dots) of the camshaft drive gear by turning the camshaft with a hex wrench until the timing mark aligns.
  14.  
  15. Now, uniformly loosen the 22 camshaft bearing cap bolts, in several passes, following the sequence shown.

    Click image to see an enlarged view

    Fig. LH camshaft bearing cap bolt loosening sequence-4.3L (3UZ-FE) Engine

  16.  
  17. Remove the 22 bearing cap bolts, 4 seal washers, oil feed pipe, 9 bearing caps, the camshaft housing plug, the oil control valve filter, and both LH camshafts. Keep all parts in order for proper reinstallation.
  18.  
  19. Remove the RH camshafts. With a hex wrench on the hex portion of the camshaft, rotate so that a 6mm service bolt can be inserted into the bolt hole in the rear face of the camshaft pulley into order to secure the camshaft in place. The bolt should be about 0.63-0.79 in. (16-20mm) long.
  20.  
  21. Align the timing mark (1 dot) of the camshaft main gear about 10° angle by turning the camshaft with a hex wrench until the timing mark aligns.
  22.  
  23. Now, uniformly loosen the 22 camshaft bearing cap bolts, in several passes, following the sequence shown.

    Click image to see an enlarged view

    Fig. RH camshaft bearing cap bolt loosening sequence-4.3L (3UZ-FE) Engine

  24.  
  25. Remove the 22 bearing cap bolts, 4 seal washers, oil feed pipe, 9 bearing caps, the camshaft housing plug, the oil control valve filter, and both LH camshafts. Keep all parts in order for proper reinstallation.
  26.  

To install:


WARNING
Since the thrust clearance of the camshaft is small, the camshaft must be kept level during removal steps. If it is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to later seize or break. Follow the procedure carefully to avoid this damage.

  1. Ensure the crankshaft pulley is in position so that its timing mark is in line with the centers of the pulley bolt and idler pulley bolt.
    WARNING
    Having the crankshaft pulley at the wrong angle can cause the piston head and valve head to come into contact with each other during camshaft removal. Always set the crankshaft pulley at the described angle.

  2.  
  3. Apply grease to the thrust portion of the LH intake and exhaust camshafts. Align the timing marks (2 dots) of the camshaft drive and driven main gears. Place the camshafts into the LH cylinder head.
  4.  
  5. Apply new seal packing material around the opening of the camshaft housing plug. Install the camshaft housing plug and the oil control valve filter into the cylinder head, as shown.

    Click image to see an enlarged view

    Fig. Installing the camshaft housing plug and oil control valve filter for the LH camshaft-4.3L (3UZ-FE) Engine



    Click image to see an enlarged view

    Fig. Installing the camshaft bearing caps in sequence on the camshaft (left shown)-4.3L (3UZ-FE) Engine



    Click image to see an enlarged view

    Fig. Identifying the locations of camshaft bearing caps bolts on the LH camshaft-4.3L (3UZ-FE) Engine

  6.  
  7. Remove any old packing material, then install new packing material around the mounting edge (not in the grooves) of the front bearing cap.
  8.  
  9. Position the front bearing cap in place. This will determine the thrust portion of the camshaft.
    1. Install the other bearing caps, in sequence shown, with the arrow marks facing forward.
    2.  
    3. Push the camshaft oil seal into place by pushing from the front of the engine. Install a new seal washer to the front bearing cap bolts.
    4.  
    5. Apply a light coat of oil to bearing cap bolt threads and under the heads of the bearing cap bolts -D- and -E-, as shown. Do NOT apply engine oil under the heads of bearing cap bolts -A-, -B- and -C-.
    6.  
    7. Bolt lengths vary for each bearing cap. Refer to the illustration for each of the following bolts:

      Bolt -A- with seal washer is 3.70 in. (94mm)
       
      Bolt -B- with seal washer is 2.83 in. (72mm)
       
      Bolt -C- is 0.98 in. (25mm)
       
      Bolt -D- is 2.05 in. (52mm)
       
      Bolt -E- is 1.50 in. (38mm)
       

    8.  

  10.  
  11. Install the oil feed pipe and the 22 bearing cap bolts in their respective locations. Uniformly tighten the 22 bearing cap bolts, in several passes, following the sequence as shown. Torque bolt -C- to a final torque of 66 inch lbs. (7.5 Nm). Torque all other bearing cap bolts to a final torque of 12 ft. lbs. (16 Nm).

    Click image to see an enlarged view

    Fig. LH camshaft bearing cap bolt tightening sequence-4.3L (3UZ-FE) Engine



    Click image to see an enlarged view

    Fig. RH camshaft bearing cap bolt tightening sequence-4.3L (3UZ-FE) Engine

  12.  
  13. Remove the service bolt installed in the rear face of the gear.
  14.  
  15. Repeat this entire procedure for the RH camshafts. Use the illustrations given for the LH camshafts, as the sequences are the same on the RH camshafts.
  16.  
  17. Check and adjust valve lash. See VALVE LASH.
  18.  
  19. Install or reconnect the following:

    Camshaft timing oil control valve.
     
    Semi-circular plugs in rear ends of each cylinder head
     
    Cylinder head covers, with new gaskets and packing material
     
    Engine hangers
     
    Variable valve timing sensors
     
    Oil dipsticks and tubes
     
    All remaining components in reverse of removal procedure.
     

  20.  

 
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