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    2003 Acura TL 3.2L VTEC SOHC 6cyl

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    Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

    Camshaft and Bearings

    Print

    These engines are not equipped with replaceable camshaft bearings.

    REMOVAL & INSTALLATION



    2RZ-FE and 3RZ-FE Engines
    1. Remove the timing chain from the engine using the procedures found in this section.
    2.  
    3. Remove the exhaust camshaft by bringing the service bolt hole of the driven sub-gear upwards. Turn the hexagon wrench head portion of the exhaust camshaft with a wrench.
    4.  
    5. Secure the exhaust camshaft sub-gear to the main gear with a service bolt. The thread diameter should be 6mm x 1.0mm thread 1620mm long.
    6.  

    When you remove the camshaft, be sure that the torsion spring force of the sub-gear has been eliminated by the above operation.

    1. Uniformly loosen and remove the exhaust bearing cap bolts (10 of them), in several passes. Use the reverse order of the tightening sequence. Remove the bearing caps and lift out the exhaust side camshaft. Do the same for the intake camshafts.
    2.  

    If the camshaft is not being lifted out straight and level, reinstall the No. 3 cap with the two bolts. Alternately loosen then remove the bearing cap bolts with the camshaft pulled up. Do NOT pry on or force the camshaft.

    1. Inspect the camshafts for runout. Inspect the cam lobes and journals. The bearings are part of the cylinder head and bearing caps and should be inspected for flaking or scoring. If the bearings are damaged, the caps and the cylinder head will have to be replaced as a set. The camshaft journal oil and thrust clearances should be checked.
    2.  

    To install:



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    Fig. Install the camshaft with the pin facing upwards2RZ-FE and 3RZ-FE engines



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    Fig. Intake camshaft bearing cap locations2RZ-FE and 3RZ-FE engines



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    Fig. Tighten the intake bearing caps following this order2RZ-FE and 3RZ-FE engines

    When installing the camshafts; since the thrust clearance of the shafts is small, the cam must be kept level while it is being installed. If it is not kept level, the portion of the head receiving the shaft thrust may crack or be damaged. This can cause the camshaft to seize or break.

    1. Install the intake camshaft as follows:
      1. Apply multi-purpose grease to the thrust portion of the intake camshaft.
      2.  
      3. Position the intake camshaft with the pin facing upward.
      4.  
      5. Install the bearing caps in their proper locations. Apply a light coat of engine oil to the threads and install the cap bolts. Uniformly tighten the cap bolts in the sequence shown to 12 ft. lbs. (16 Nm).
      6.  

    2.  



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    Fig. Position the exhaust camshaft bearing caps as shown2RZ-FE and 3RZ-FE engines



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    Fig. Tighten the exhaust bearing cap bolts in this order2RZ-FE and 3RZ-FE engines

    1. Install the exhaust camshaft as follows:
      1. Apply engine oil to the thrust portion of the intake camshaft.
      2.  
      3. Engage the exhaust camshaft gear to the intake camshaft gear by matching the timing marks (one and two dots) on each other.
      4.  
      5. Roll down the exhaust camshaft onto the bearing journals while engaging the gears with each other. Install the bearing caps in their proper locations.
      6.  
      7. Apply a light coat of engine oil to the threads and install the cap bolts. Uniformly tighten the cap bolts in the sequence shown to 12 ft. lbs. (16 Nm).
      8.  
      9. Remove the service bolt from the driven sub-gear. Check that the intake and exhaust camshafts turn smoothly.
      10.  

    2.  
    3. Set No. 1 cylinder to TDC compression stroke. The crankshaft pulley groove aligns with the 0 mark on timing cover and camshaft timing marks with one dot and two dots will be in a straight line on the cylinder head surface.
    4.  
    5. Install the timing gear. Place the gear over the straight pin of the intake camshaft.
      1. Hold the intake camshaft with a wrench. Install and tighten the bolt to 54 ft. lbs. (74 Nm).
      2.  
      3. Hold the exhaust camshaft and install the bolt and distributor gear. Tighten the bolt to 34 ft. lbs. (46 Nm).
      4.  

    6.  
    7. Install the chain tensioner, using a new gasket (mark toward the front) as follows:
      1. Release the ratchet pawl, fully push in the plunger and apply the hook to the pin so that the plunger cannot spring out.
      2.  
      3. Turn the crankshaft pulley clockwise to provide some slack for the chain on the tensioner side.
      4.  
      5. Push the tensioner by hand until it touches the head installation surface, then install the 2 nuts. Tighten the nuts to 13 ft. lbs. (18 Nm). Check that the hook of the tensioner is not released.
      6.  
      7. Turn the crankshaft to the left so that the hook of the chain tensioner is released from the pin of the plunger, allowing the plunger to spring out and the slipper to be pushed into the chain.
      8.  

    8.  
    9. Check and adjust the valve clearance. Intake valve clearance is 0.0060.010 inch (0.150.25mm) and exhaust valve clearance is 0.0100.014 inch (0.250.35mm).
    10.  
    11. Recheck the engine for proper valve timing. Check and adjust the valve clearance.
    12.  
    13. Install the spark plugs and the semi-circular plug.
    14.  
    15. Recheck the engine for proper valve timing. Install the valve cover and engine hangers. Tighten the engine hanger bolts to 30 ft. lbs. (42 Nm).
    16.  
    17. Reinstall all other parts from the timing chain removal. Fill any fluids, start the engine, add fluid as required.
    18.  

    5VZ-FE Engine
    1. Remove both cylinder head covers.
    2.  
    3. Remove the semi-circular plugs.
    4.  



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    Fig. Remove the cylinder head covers from the engine5VZ-FE engine



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    Fig. Align the gears by turning the camshaft with a wrench on the flats providednot the lobes5VZ-FE engine



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    Fig. Removing the bolt from the camshaft pulley



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    Fig. Carefully detach the camshaft pulley



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    Fig. Be careful not to lose the dowel pin



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    Fig. The camshaft pulleys are marked right and left



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    Fig. Left and right camshaft pulleys5VZ-FE engine



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    Fig. Unfasten the camshaft's bearing cap retaining bolts . . .



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    Fig. . . . then remove the camshaft bearing cap



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    Fig. Lift the rear bearing cap and pull out the camshaft seal



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    Fig. Carefully remove the camshaft from the cylinder head



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    Fig. Use an appropriate size bolt to release the spring force of the sub-gear5VZ-FE engine



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    Fig. Right hand exhaust camshaft bearing cap loosening sequence5VZ-FE engine

    1. Remove the right exhaust camshaft as follows:
      1. Bring the service bolt hole of the driven sub-gear upward by turning the hexagon head portion of the exhaust camshaft with a wrench.
      2.  
      3. Align the timing mark (two dot marks) of the camshaft drive and driven gears by turning the camshaft with a wrench.
      4.  
      5. Secure the exhaust camshaft sub-gear to the driven gear with a service bolt 6mm in diameter by 1.0mm pitch thread, 1620mm long.
      6.  

    2.  

    When removing the camshaft, make sure that the torsion spring force of the sub-gear has been eliminated by the above operation.

    1. Uniformly loosen and remove the bearing cap bolts in several passes, in the sequence shown.
    2.  
    3. Remove the bearing caps and camshaft. Make a note of the bearing cap positions for proper installation.
    4.  


    WARNING
    Do NOT pry on or attempt to force the camshaft with a tool or other object.

    1. Remove the right hand intake camshaft as follows:
      1. Uniformly loosen and remove the bearing cap bolts in several passes, in the sequence shown.
      2.  
      3. Remove the bearing caps, oil seal and camshaft. Make a note of the bearing cap positions for proper installation.
      4.  

    2.  



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    Fig. Loosen the right hand intake camshaft caps as shown5VZ-FE engine



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    Fig. When aligning the gears, turn the camshaft with the flats provided. Do NOT place a wrench on the lobes5VZ-FE engine



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    Fig. The spring force of the sub-gear can be overcome by using a 6mm restraining bolt5VZ-FE engine



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    Fig. Left hand exhaust camshaft bearing cap loosening sequence5VZ-FE engine

    1. Remove the left exhaust camshaft as follows:
      1. Align the timing mark (1 dot mark) of the camshaft drive and driven gears by turning the camshaft with a wrench.
      2.  
      3. Secure the exhaust camshaft sub-gear to the driven gear with a service bolt 6mm in diameter by 1.0mm pitch thread, 1620mm long.
      4.  

    2.  

    When removing the camshaft, make sure that the torsion spring force of the sub-gear has been eliminated by the above operation.

    1. Uniformly loosen and remove the bearing cap bolts in several passes, in the sequence shown.
    2.  
    3. Remove the bearing caps and camshaft. Make a note of the bearing cap positions for proper installation.
    4.  


    WARNING
    Do NOT pry on or attempt to force the camshaft out.

    1. Remove the left hand intake camshaft as follows:
      1. Uniformly loosen and remove the bearing cap bolts in several passes, in the sequence shown.
      2.  
      3. Remove the bearing caps, oil seal and camshaft. Make a note of the bearing cap positions for proper installation.
      4.  

    2.  



    Click image to see an enlarged view

    Fig. The left hand intake camshaft caps must be loosened as shown5VZ-FE engine

    To install:

    1. Install the right intake camshaft as follows:
      1. Apply engine oil to the thrust portion of the intake camshaft.
      2.  
      3. Position the intake camshaft at a 90° angle of the timing mark (two dot marks) on the cylinder head.
      4.  
      5. Install the bearing caps in their proper locations. Apply a light coat of engine oil to the threads and under the heads of the bearing cap bolts. Install the cap bolts.
      6.  
      7. Uniformly tighten the cap bolts in the sequence shown to 12 ft. lbs. (16 Nm).
      8.  

    2.  



    Click image to see an enlarged view

    Fig. Tighten the right side intake camshaft caps as shown5VZ-FE engine

    1. Install the right exhaust camshaft as follows:
      1. Apply engine oil to the thrust portion of the intake camshaft.
      2.  
      3. Align the timing marks (two dot marks) of the camshaft drive and driven gears.
      4.  
      5. Roll down the exhaust camshaft onto the bearing journals while engaging the gears with each other. Install the bearing caps in their proper locations.
      6.  
      7. Apply a light coat of engine oil to the threads and under the heads of the bearing cap bolts. Install the cap bolts.
      8.  
      9. Uniformly tighten the cap bolts in the sequence shown to 12 ft. lbs. (16 Nm).
      10.  
      11. Remove the service bolt from the driven sub-gear. Check that both the intake and exhaust camshafts turn smoothly.
      12.  
      13. Align the timing marks (two dot mark) of the camshaft drive and driven gears by turning the camshaft with a wrench.
      14.  

    2.  



    Click image to see an enlarged view

    Fig. When installing the exhaust camshaft, make sure the timing marks align5VZ-FE engine



    Click image to see an enlarged view

    Fig. Use this sequence to tighten the right hand exhaust camshaft bearing cap bolts5VZ-FE engine

    1. Install the left intake camshaft as follows:
      1. Apply engine oil to the thrust portion of the intake camshaft.
      2.  
      3. Position the intake camshaft at a 90° angle of the timing mark (one dot mark) on the cylinder head.
      4.  
      5. Install the bearing caps in their proper locations. Apply a light coat of engine oil to the threads and under the heads of the bearing cap bolts. Install the cap bolts.
      6.  
      7. Uniformly tighten the cap bolts in the sequence shown to 12 ft. lbs. (16 Nm).
      8.  

    2.  



    Click image to see an enlarged view

    Fig. Tightening sequence for the left hand intake camshaft cap bolts5VZ-FE engine

    1. Install the left exhaust camshaft as follows:
      1. Apply engine oil to the thrust portion of the intake camshaft.
      2.  
      3. Align the timing marks (1 dot marks) of the camshaft drive and driven gears.
      4.  
      5. Roll down the exhaust camshaft onto the bearing journals while engaging the gears with each other. Install the bearing caps in their proper locations.
      6.  
      7. Apply a light coat of engine oil to the threads and under the heads of the bearing cap bolts. Install the cap bolts.
      8.  
      9. Uniformly tighten the cap bolts in the sequence shown to 12 ft. lbs. (16 Nm).
      10.  
      11. Remove the service bolt.
      12.  

    2.  



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    Fig. Tighten the left side exhaust camshaft cap bolts in this sequence5VZ-FE engine

    1. Check and adjust the valve clearance.
    2.  
    3. Install the semi-circular plugs.
    4.  
    5. Install the cylinder head covers. Uniformly tighten the bolts in several passes to 53 inch lbs. (6 Nm).
    6.  

    1FZ-FE Engine
    1. Remove the cylinder head cover.
    2.  
    3. Remove the semicircular plug from the cylinder head.
    4.  
    5. Remove the spark plugs.
    6.  
    7. Set the No. 1 cylinder to TDC of the compression stroke as follows:
      1. Turn the crankshaft pulley and align its groove with the 0 mark on the timing chain cover.
      2.  
      3. Check that the timing marks (one and two dots) of the camshaft drive and driven gears are in straight line on the cylinder head surface. If not, turn the crankshaft one revolution (360°) and align the marks.
      4.  

    8.  



    Click image to see an enlarged view

    Fig. Turn the crankshaft pulley and align its groove with the 0 mark on the timing chain cover1FZ-FE engine



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    Fig. Check that the marks on the camshaft pulley are aligned1FZ-FE engine



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    Fig. Matchmark the position of the chain on the gear1FZ-FE engine

    1. Remove the chain tensioner.
    2.  
    3. Place matchmarks on the camshaft timing gear and the timing chain and remove the camshaft timing gear, as follows.
      1. Hold the intake camshaft with a wrench and remove the bolt and the distributor gear.
      2.  
      3. Remove the camshaft timing gear and chain from the intake camshaft and leave on the slipper and the damper.
      4.  

    4.  

    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. To avoid this, the following steps should be carried out.

    1. Remove the exhaust camshaft as follows:
      1. Bring the service bolt hole of the driven sub-gear upward by turning the hexagon wrench head portion of the exhaust camshaft with a wrench.
      2.  
      3. Secure the exhaust camshaft sub-gear to the main gear with a service bolt. When removing the camshaft, make sure that the torsion spring force of the sub-gear has been eliminated by the above operation.
      4.  
      5. Set the timing mark (two dot marks) of the camshaft driven gear at approximately a 35 degree angle by turning the hexagon wrench head portion of the intake camshaft with a wrench.
      6.  

    2.  



    Click image to see an enlarged view

    Fig. Turn the camshaft by using the flats provided. Do NOT use the lobes1FZ-FE engine

    1. Lightly push the camshaft towards the rear without applying excessive force.
    2.  
    3. Loosen and remove the No. 1 bearing cap bolts, alternately loosening the left and right bolts uniformly.
    4.  
    5. Loosen and remove the No. 2, No. 3, No. 5 and the No. 7 bearing cap bolts, alternately loosening the left and right bolts uniformly in several passes, in sequence.
    6.  

    Do NOT remove the No. 4 and No. 6 bearing cap bolts at this stage.

    1. Remove the four bearing caps.
    2.  
    3. Alternately and uniformly loosen and remove the No. 4 and the No. 6 bearing cap bolts.
    4.  
    5. If the camshaft is not being lifted out straight and level, retighten the four No. 4 and No. 6 bearing cap bolts. Then reverse the order of the above steps from (g) to (e) and repeat steps from (c) to (h) once again.
    6.  
    7. Remove the two bearing caps and exhaust camshaft. Do NOT pry on or attempt to force the camshaft with a tool or any other object.
    8.  

    1. Remove the intake camshaft as follows:
      1. Set the timing mark (two dot marks) of the camshaft drive gear at approximately a 25° angle by turning the hexagon wrench head portion of the intake camshaft with a wrench.
      2.  

    2.  

    This angle allows the No. 1 and the No. 4 cylinder cam lobes of the intake camshaft to push their valve lifters evenly.

    1. Lightly push the intake camshaft towards the front without applying excessive force.
    2.  
    3. Loosen and remove the No. 1 bearing cap bolts, alternately loosening the left and the right bolts uniformly.
    4.  
    5. Loosen and remove the No. 3, No. 4, No. 6 and the No. 7 bearing cap bolts, alternately loosening the left and right bolts uniformly in several passes in sequence.
    6.  

    Do NOT remove the No. 2 and No. 5 bearing cap bolts at this stage.

    1. Remove the four bearing caps.
    2.  
    3. Alternately and uniformly loosen and remove the No. 2 and the No. 5 bearing cap bolts.
    4.  
    5. If the camshaft is not being lifted out straight and level, retighten the four No. 2 and No. 5 bearing cap bolts. Then reverse the order of the above steps from (e) to (c) and repeat steps from (a) to (f) once again.
    6.  
    7. Remove the two bearing caps and the exhaust camshaft.
    8.  

    To install:

    1. Install the intake camshaft as follows:
    2.  

    Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being installed. 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. To avoid this, the following steps should be carried out.

    1. Apply engine oil to the thrust portion of the intake camshaft.
    2.  
    3. Lightly place the intake camshaft on top of the cylinder head so that the No. 1 and the No. 4 cylinder cam lobes face downward.
    4.  
    5. Lightly push the camshaft towards the front without applying excessive force. Place the No. 2 and the No. 5 bearing caps in their proper location.
    6.  
    7. Temporarily tighten these bearing cap bolts uniformly and alternately in several passes until the bearing caps are snug with the cylinder head.
    8.  
    9. Place the No. 3, No. 4, No. 6, and the No. 7 bearing caps in their proper location. Temporarily tighten these bearing cap bolts, alternately tightening the left and right bolts uniformly.
    10.  
    11. Place the No. 1 bearing cap in its proper location. Check that there is no gap between the cylinder head and the contact surface of the bearing cap.
    12.  
    13. Uniformly tighten the 14 bearing cap bolts in several passes to 12 ft. lbs. (16 Nm).
    14.  

    1. Install the exhaust camshaft as follows:
      1. Set the timing mark (two dot marks) of the camshaft drive gear at approximately 35° angle by turning the hexagon wrench head portion of the intake camshaft with a wrench.
      2.  
      3. Apply engine oil to the thrust portion of the exhaust camshaft. Engage the exhaust camshaft gear to the intake camshaft gear by matching the timing marks (two dot marks) on each gear.
      4.  
      5. Roll down the exhaust camshaft onto the bearing journals while engaging the gears with each other. Lightly push the intake camshaft towards the front without applying excessive force.
      6.  
      7. Install the No. 4 and the No. 6 bearing caps in their proper location. Temporarily tighten these bearing cap bolts, alternately tightening the left and right bolts uniformly.
      8.  
      9. Place the No. 2, No. 3, No. 5, and the No. 7 bearing caps in their proper location. Temporarily tighten these bearing cap bolts, alternately tightening the left and right bolts uniformly.
      10.  
      11. Tighten the 14 bearing cap bolts in several passes to 12 ft. lbs. (16 Nm).
      12.  
      13. Bring the service bolt installed in the driven sub-gear upward by turning the hexagon wrench head portion of the camshaft with a wrench. Remove the service bolt.
      14.  
      15. Check that the intake and the exhaust camshafts turn smoothly.
      16.  

    2.  
    3. Set the No. 1 cylinder to TDC of the compression stroke as follows:
      1. Turn the crankshaft pulley, and align its groove with the timing mark 0 of the timing chain cover. Turn the camshaft so that the timing marks with one and two dots will be in straight line on the cylinder head surface.
      2.  

    4.  
    5. Install the camshaft timing gear as follows:
      1. Check that the matchmarks on the camshaft timing gear and the timing chain are aligned. Place the gear over the straight pin of the intake camshaft.
      2.  
      3. Align the straight pin of the distributor gear with the straight pin groove of the intake camshaft gear.
      4.  
      5. Hold the intake camshaft with a wrench, install and tighten the bolt to 54 ft. lbs. (74 Nm).
      6.  

    6.  
    7. Install the chain tensioner. Push the tensioner by hand until it touches the head installation surface, then install and tighten the two nuts to 15 ft. lbs. (21 Nm).
    8.  
    9. Check the valve timing as follows:
      1. Turn the crankshaft pulley, and align its groove with the timing mark 0 of the timing chain cover. Always turn the crankshaft clockwise.
      2.  
      3. Check that the timing marks (one and two dots) of the camshaft drive and driven gears are in straight line on the cylinder head surface. If not, turn the crankshaft one revolution (360°) and align the marks.
      4.  

    10.  
    11. Check valve clearance and adjust if necessary.
    12.  
    13. Install the spark plugs.
    14.  
    15. Install the semi-circular plug to the cylinder head.
    16.  
    17. Make sure that the No. 1 cylinder is in TDC of the compression stroke.
    18.  
    19. Install the cylinder head cover.
    20.  

    2UZ-FE Engine

    This is a lengthy and complicated procedure requiring careful and precise work.

    1. Disconnect the negative battery cable.
    2.  
    3. Drain the engine coolant.
    4.  
    5. Remove the throttle body cover.
    6.  
    7. Disconnect the timing belt from the camshaft pulleys. Please see the timing belt procedure in this section. Use care when working around the timing belt. Do NOT allow anything to drop inside the timing belt cover. Do NOT allow the timing belt to come into contact with oil, water or dust.
    8.  
    9. Remove the camshaft timing pulleys. Please see the timing belt procedure in this section.
    10.  
    11. Remove the camshaft position sensor by removing the bolt and stud bolt and then removing the sensor.
    12.  
    13. If necessary, disconnect the power steering pump from the engine.
    14.  
    15. Remove the ignition coils.
    16.  
    17. Remove the three bolts and the stud bolt and remove the left side and right side timing belt rear plates.
    18.  
    19. Disconnect the fuel lines.
    20.  
    21. Tag for identification and detach the following electrical connectors:

      Throttle Position (TP) sensor
       
      Accelerator pedal position sensor connector
       
      Throttle control motor connector
       
      VSV connector for the EVAP system
       
      Eight fuel injector connectors
       
      Engine Coolant Temperature (ECT) sensor
       
      Water sender gauge connector
       
      Eight ignition coil connectors
       
      Two heated oxygen sensor connectors.
       

    22.  
    23. Tag for identification and disconnect the following hoses:

      The vacuum hose from the fuel pressure regulator.
       
      The PCV hose from the PCV valve on the left side cylinder head.
       
      The EVAP hose from the charcoal canister from the VSV for the EVAP system.
       
      The EVAP hose from the charcoal canister from the EVAP pipe on the intake manifold.
       
      The power steering vacuum switch lines from the intake manifold.
       
      The brake booster vacuum line.
       

    24.  
    25. Remove the upper and lower intake manifolds.
    26.  
    27. Remove the 18 bolts and seal washers from the cylinder head covers and remove the covers and gaskets. If necessary, remove semi-circular plugs and camshaft housing plugs.
    28.  


    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 head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break. To avoid this, the following steps should be carried out.

    1. Remove the camshafts using the following procedure.
      1. Check the crankshaft pulley position. Check that the timing mark of the crankshaft pulley is aligned with the centers of the crankshaft pulley bolt and the idler pulley.
      2.  

    2.  


    WARNING
    Having the crankshaft pulley at the wrong angle can cause the piston head and valve head to come into contact with each other when you remove the camshaft, causing damage. Always set the crankshaft pulley at the correct angle.

    1. Remove the right side camshafts. Bring the service bolt hole of the sub-gear upward by turning the hexagon wrench portion of the exhaust camshaft with a wrench. Secure the sub-gear to the main gear with a bolt 6mm in diameter x 1.0mm thread pitch x 1620mm long.
    2.  


    WARNING
    When removing the camshafts, make sure that the torsion spring force of the sub-gear has been eliminated by the above operation.

    1. Set the timing mark (one dot mark) of the camshaft main gear at an angle approximately 10° above horizontal by turning the hexagon wrench portion of the exhaust camshaft with a wrench.
    2.  
    3. Uniformly loosen and remove the 22 bearing cap bolts in several passes, in the sequence illustrated.
    4.  
    5. Remove the oil feed pipe, the bearing caps and the camshafts.
    6.  
    7. Remove the left side camshafts. Bring the service bolt hole of the sub-gear upward by turning the hexagon wrench portion of the exhaust camshaft with a wrench. Secure the sub-gear to the main gear with a bolt 6mm in diameter x 1.0mm thread pitch x 1620mm long.
    8.  


    WARNING
    When removing the camshafts, make sure that the torsion spring force of the sub-gear has been eliminated by the above operation.

    1. Align timing marks (two dot marks) of the camshaft drive gear by turning the hexagon wrench portion of the exhaust camshaft with a wrench.
    2.  
    3. Uniformly loosen and remove the 22 bearing cap bolts in several passes, in the sequence illustrated. Note that there are five different length bearing cap bolts that, at assembly, MUST be returned to their proper locations. Mark these bolts or place in holes punched through cardboard to make sure they will be in the proper location and sequence. Take the time to accurately measure each bolt and mark its length on the cardboard. The reason for this is that at assembly, certain lengths of bolts are handled differently, and they are identified by length.
    4.  
    5. Remove the oil feed pipe, the bearing caps and the camshafts.
    6.  

    Use care to keep the bearing caps in order, in the exact same sequence and direction as originally installed on the engine.



    Click image to see an enlarged view

    Fig. Cylinder heads, camshafts and related components2UZ-FE engine



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    Fig. Setting up the engine and aligning the timing marks before right side camshaft removal. Note the 6mm bolt used to lock together the two-piece cam gear2UZ-FE engine



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    Fig. Setting up the engine and aligning the timing marks before left side camshaft removal. Note the 6mm service bolt used to lock together the two-piece cam gear2UZ-FE engine



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    Fig. Use this sequence to loosen the camshaft bearing cap bolts: topLeft Side Bank; BottomRight Side Bank2UZ-FE engine



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    Fig. When installing the right side camshafts, align the timing marks as shown and apply sealer to the front bearing cap where indicated2UZ-FE engine



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    Fig. When installing the left side camshafts, align the timing marks as shown and apply sealer to the front bearing cap where indicated2UZ-FE engine



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    Fig. After the camshaft front bearing caps are set in place, but before the bolts are final-tightened, push in new oil seals2UZ-FE engine



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    Fig. Make sure the camshaft bearing caps are properly identified and correctly installed. Verify the proper length bolt is installed in the correct location, then tighten in the sequence shown2UZ-FE engine, right side bank shown



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    Fig. Make sure the camshaft bearing caps are properly identified and correctly installed. Verify the proper length bolt is installed in the correct location, then tighten in the sequence shown2UZ-FE engine, left side bank shown

    To install:

    1. If disassembled, assemble the exhaust camshafts and sprockets using the following procedure:
      1. Install the camshaft gear spring, camshaft sub-gear and wave washer. Attach the pins on the gears to the gear spring ends.
      2.  
      3. Install the snapring.
      4.  
      5. Mount the hexagon wrench head portion of the camshaft in a vise. Use care not to damage the camshaft.
      6.  
      7. Using Toyota's Special Service tool, or a suitable pin-type spanner, align the holes of the camshaft main gear and sub-gear by turning the camshaft sub-gear counterclockwise, and temporarily install a bolt 6mm in diameter x 1.0mm thread pitch x 1620mm long. Make sure the teeth of the gears are aligned, and then tighten the bolt to secure the assembly.
      8.  

    2.  
    3. Remove any old sealer from the semi-circular camshaft housing plugs. Apply fresh sealer to the plug grooves and install the camshaft housing plugs to the cylinder heads.
    4.  


    WARNING
    Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being installed. If the camshaft is not kept level, the portion of the head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break. To avoid this, the following steps should be carried out.

    1. Install the right side camshafts using the following procedure:
      1. Apply engine assembly lube or multipurpose grease to the thrust portion of the intake and exhaust camshafts.
      2.  
      3. Lay the intake and exhaust camshafts carefully in position.
      4.  
      5. Set the timing mark (one dot mark) of the camshaft main gear at an angle approximately 10° above horizontal by turning the hexagon wrench portion of the exhaust camshaft with a wrench.
      6.  
      7. Remove any old sealer from the front bearing cap. Apply a bead of fresh sealer approximately 1 / 16 inch in diameter, to the areas indicated in the illustration. Use care to keep sealer out of the front bearing cap grooves. Assemble the front bearing cap before the sealer has a chance to skin-over (start to cure). Note that installing the front bearing cap will determine the thrust clearance of the camshaft.
      8.  
      9. Install the other bearing caps in the sequence illustrated with the arrow mark facing forward. Align the arrow marks at the front and rear of the cylinder head with the mark on the bearing cap.
      10.  
      11. Install a new camshaft oil seal.
      12.  
      13. Apply a light coat of engine oil on the threads of only two sizes (the two longest) of camshaft bearing cap bolts. These bolts are:

        The 2.83 inch (72mm) bolts (called bolt "D").
         
        The 3.70 inch (94mm) bolts (called bolt "E").
         

      14.  
      15. Do NOT apply engine oil under the heads of the remaining camshaft bearing cap bolts. These bolts are:

        The 0.98 inch (25mm) bolts (called bolt "A").
         
        The 1.50 inch (38mm) bolts (called bolt "B").
         
        The 2.05 inch (52mm) bolts (called bolt "C").
         

      16.  

    2.  
    3. Uniformly tighten the 22 bearing cap bolts in several passes, in the sequence illustrated:
      1. Torque the shortest bolts (bolt "A") to 69 inch lbs. (7.5 Nm).
      2.  
      3. Torque all other bolts to 144 inch lbs. (16 Nm).
      4.  
      5. Bring the service bolt hole of the sub-gear upward by turning the hexagon wrench portion of the exhaust camshaft with a wrench. Remove the bolt. This allows the torsion spring and sub-gear to remove gear backlash.
      6.  

    4.  
    5. Install the left side camshafts using the same procedure.
    6.  
    7. Turn the camshaft(s) and position so the lobes are upward, and check and adjust the valve clearance, noting the following:
      1. Turn the crankshaft pulley and align its groove with the timing mark 0 on the No. 1 timing belt cover.
      2.  
      3. Install the timing belt rear plates.
      4.  
      5. Check that the timing marks of the camshaft timing pulleys and the timing belt rear plates are aligned. If not, turn the crankshaft exactly one revolution (360°) and align the marks.
      6.  
      7. Using a feeler gauge, measure the distance between the valve lifter and camshaft. Clearance should be 0.0060.010 inch (0.150.25mm) on the intake camshaft and 0.0100.014 inch (0.250.35mm) on the exhaust camshaft.
      8.  

    8.  
    9. Clean all old sealer from the four semi-circular camshaft plugs. Apply a fresh bead of sealer to the center groove of the plugs and install the plugs to the cylinder head.
    10.  
    11. Clean all old sealer from the cylinder head covers. Apply fresh sealer at the joint where the camshaft front bearing cap meets the cylinder head cover sealing surface. Use new cylinder head cover gaskets. Make sure the seal washers under the bolt heads are in good condition. Install the cylinder head covers. Uniformly tighten the bolts in several passes with final torque to 53 inch lbs. (6 Nm).
    12.  
    13. Install the upper and lower intake manifolds using the procedures found in this section. Use care to make sure the lower intake manifold gaskets are properly installed. Factory replacement gaskets should have white paint marks which should be facing upward. Align the port holes of the gasket and the cylinder head.
    14.  
    15. Using the identification tags made at disassembly, connect the following hoses to the intake manifold:

      Vacuum hose to the fuel pressure regulator.
       
      PCV hose to the PCV valve on the left side cylinder head.
       
      EVAP hose to the charcoal canister from the VSV for the EVAP system.
       
      EVAP hose to the charcoal canister from the EVAP pipe on the intake manifold.
       
      Power steering vacuum switch lines to the intake manifold.
       
      Brake booster vacuum line.
       

    16.  
    17. Using the identification tags made at disassembly, attach the following electrical connectors:

      Throttle Position (TP) sensor
       
      Accelerator pedal position sensor connector
       
      Throttle control motor connector
       
      VSV connector for the EVAP system
       
      Eight fuel injector connectors
       
      Engine Coolant Temperature (ECT) sensor
       
      Water sender gauge connector
       
      Eight ignition coil connectors
       
      Two heated oxygen sensor connectors
       

    18.  
    19. Connect the fuel lines.
    20.  
    21. If not done so earlier, install the timing belt rear plates and tighten the bolts to 66 inch lbs. (7.5 Nm).
    22.  
    23. Install the throttle body.
    24.  
    25. Install the ignition coils to their proper spark plug.
    26.  
    27. Install the automatic transmission fluid dipstick and fill tube.
    28.  
    29. Connect the front exhaust pipe.
    30.  
    31. Install the power steering pump.
    32.  
    33. Install the camshaft position sensor.
    34.  
    35. Install the camshaft timing pulleys and the timing belt.
    36.  
    37. An oil and filter change is recommended.
    38.  
    39. Refill the engine with coolant.
    40.  
    41. Check all fluid levels. Start the engine and check for leaks and abnormal noises.
    42.  

    INSPECTION



    A dial indicator, micrometer and inside micrometer are all needed to properly measure the camshaft and camshaft housing. If these instruments are available, proceed; if they are not available, have the parts checked at a reputable machine shop. Camshaft specifications are included in the Specifications Chart in this section.

    1. Using the micrometer, measure the height of each cam lobe. If a lobe height is less than the minimum specified, the lobe is worn and the cam must be replaced.
    2.  
    3. Place the cam in V-blocks and measure its run-out at the center journal with a dial indicator. Replace the cam if run-out exceeds:

      1FZ-FE, 2RZ-FE, 3RZ-FE and 5VZ-FE engines: 0.0024 inch (0.06mm)
       
      2UZ-FE engine: 0.0031 inch (0.08mm)
       

    4.  
    5. Using the micrometer, measure journal diameter, jot down the readings and compare the readings with those listed in the Specifications chart. Measure the housing bore inside diameter with the inside micrometer, and jot the measurements down. Subtract the journal diameter measurement from the housing bore measurement. If the clearance is greater than the maximum listed under Bearing Clearance in the chart, replace the camshaft and/or the housing.
    6.  

     
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