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    1997 Cadillac Deville D'Elegance 4.6L SFI DOHC 8cyl

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    Toyota Sienna 2000-06

    Timing Belt

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    General Information



    Timing belts are typically only used on overhead camshaft engines. Timing belts are used to synchronize the crankshaft with the camshaft, similar to a timing chain on an overhead valve (pushrod) engine. Unlike a timing belt, a timing chain will normally last the life of the engine without needing service or replacement. Timing belts use raised teeth to mesh with sprockets to operate the valve train of an overhead camshaft engine.

    Whenever a vehicle with an unknown service history comes into your repair facility or is recently purchased, here are some points that should be asked to help prevent costly engine damage:



    Does the owner know if, or when the belt was replaced-
     
    If the vehicle purchased is used, or the condition and mileage of the last timing belt replacement are unknown, it is recommended to inspect, replace, or at least inform the owner that the vehicle is equipped with a timing belt.
     
    Note the mileage of the vehicle. The average replacement interval for a timing belt is approximately 60,000 miles (96,000 km).
     

    Interference Engines

    Engines, chain- or belt-driven, can be classified as either free-running or interference, depending on what would happen if the piston-to-valve timing is disrupted. A free-running engine is designed with enough clearance between the pistons and valves to allow the crankshaft to rotate (pistons still moving) while the camshaft stays in one position (several valves fully open). If this condition occurs normally, no internal engine damage will result. In an interference engine, there is not enough clearance between the pistons and valves to allow the crankshaft to turn without the camshaft being in time.

    An interference engine can suffer extensive internal damage if a timing belt fails. The piston design does not allow clearance for the valve to be fully open and the piston to be at the top of its stroke. If the belt fails, the piston will collide with the valve and will bend or break the valve, damage the piston, and/or bend a connecting rod. When this type of failure occurs, the engine will need to be replaced or disassembled for further internal inspection; either choice costing many times that of replacing the timing belt.

    Inspection




    NOTE
    For manufacturer-s recommended service interval, refer to the maintenance interval chart located in this manual.

    The average replacement interval for a timing belt is approximately 60,000 miles (96,000 km). If, however, the timing belt is inspected earlier or more frequently than suggested, and shows signs of wear or defects, the belt should be replaced at that time.


    WARNING
    Never allow antifreeze, oil or solvents to come into with a timing belt. If this occurs immediately wash the solution from the timing belt. Also, never excessive bend or twist the timing belt; this can damage the belt so that its lifetime is severely shortened.



    Click image to see an enlarged view

    Fig. Never bend or twist a timing belt excessively, and do not allow solvents, antifreeze, gasoline, acid or oil to come into contact with the belt

    Inspect both sides of the timing belt. Replace the belt with a new one if any of the following conditions exist:



    Hardening of the rubber-back side is glossy without resilience and leaves no indentation when pressed with a fingernail
     
    Cracks on the rubber backing
     
    Cracks or peeling of the canvas backing
     
    Cracks on rib root
     
    Cracks on belt sides
     
    Missing teeth or chunks of teeth
     
    Abnormal wear of belt sides-the sides are normal if they are sharp, as if cut by a knife.

    Click image to see an enlarged view

    Fig. Clean the timing belt before inspection so that imperfections or defects are easier to recognize



    Click image to see an enlarged view

    Fig. Inspect the timing belt for damage, such as a broken or missing tooth, which may be due to a damaged pulley



    Click image to see an enlarged view

    Fig. Back surface worn or cracked from a possible overheated engine or interference with the belt cover



    Click image to see an enlarged view

    Fig. Side wear from improper installation or a defective pulley plate



    Click image to see an enlarged view

    Fig. Worn teeth from excessive belt tension, camshaft or distributor not turning properly, or fluid leaking on the belt

     

    If none of these conditions exist, the belt does not need replacement unless it is at the recommended interval. The belt MUST be replaced at the recommended interval.


    WARNING
    On interference engines, it is very important to replace the timing belt at the recommended intervals, otherwise expensive engine damage will likely result if the belt fails.

    Removal & Installation



    1mz-FE Engine
    1. Disconnect the negative battery cable.
    2.  
    3. Remove the outer front cowl top panel assembly by performing the following procedure:
      1. Remove the wiper arm/blade assemblies head caps, nuts and assemblies.
      2.  
      3. Remove the head-to-cowl seal and the cowl panel hole cover.
      4.  
      5. Disconnect the windshield washer clip and hose.
      6.  
      7. Remove both (right and left) cowl top ventilator louvers.
      8.  
      9. Disconnect the electrical connector from the windshield wiper motor.
      10.  
      11. Remove the outer front cowl top panel assembly-to-cowl bolts and the panel.
      12.  

    4.  
    5. Raise and safely support the vehicle.
    6.  
    7. Remove the right front wheel assembly and apron seal.
    8.  
    9. Remove the alternator by performing the following procedure:
      1. Loosen the pivot bolt, adjusting lockbolt and adjusting bolt, then, remove the drive belt.
      2.  
      3. Disconnect the alternator-s electrical connector.
      4.  
      5. Remove the nut and the alternator wire.
      6.  
      7. Disconnect the wiring harness from the clip.
      8.  
      9. Remove the alternator-to-bracket pivot bolt, the washer, adjusting lockbolt and alternator.
      10.  

    10.  
    11. Loosen the power steering pump-s mount and adjusting bolt, then, remove the drive belt.
    12.  
    13. Disconnect the hose from the engine coolant reservoir.
    14.  
    15. Disconnect the Diagnostic Link Connector 1 (DLC1) from the No. 2 right side engine mounting bracket.
    16.  
    17. Remove the right side engine mounting stay, the engine moving control rod and the No. 2 right side engine mounting bracket.
    18.  
    19. Loosen the alternator-s pivot bolt, the nut and the No. 2 alternator bracket.
    20.  
    21. Using the Crankshaft Pulley Holding tool 09213-54015, Bolt tool 91651-60855 and Companion Flange Holding tool 09330-00021, or equivalent, remove the crankshaft pulley bolt.
    22.  
    23. Using a Puller -C- Set 09950-50011 (Hanger 150 tool 09951-05010, Slide Arm tool 09952-5010, Center Bolt 100 tool 09953-05010, Center Bolt 150 tool 09953-05020 and 2 No. 2 Claw tools 09954-05020), pull the crankshaft pulley from the crankshaft.
    24.  
    25. Remove the lower (No. 1) timing belt cover. Remove the timing belt guide from the crankshaft.
    26.  
    27. Remove the engine wire protector clamps from the upper (No. 2) timing belt cover and remove the upper (No. 2) timing belt cover.
    28.  
    29. Remove the right side engine mounting brace
      NOTE
      If reusing the timing belt, be sure that you can still read the installation marks. If not, place new installation marks on the timing belt to match the timing marks of the camshaft timing pulleys.

    30.  
    31. Temporarily install the crankshaft pulley bolt.
    32.  
    33. Set the No. 1 cylinder to Top Dead Center (TDC) of the compression stroke, as follows:
      1. Rotate the crankshaft (CLOCKWISE) to align the timing marks: dimple on the crankshaft timing sprocket with the notch on the oil pump body.
      2.  
      3. Check that the timing marks on the camshaft sprockets and the rear timing belt cover are aligned; if not, rotate the crankshaft 360 degrees (1 revolution) and align the marks.
      4.  

    34.  
    35. Remove the timing belt tensioner and the timing belt.

      Click image to see an enlarged view

      Fig. Exploded view of the timing belt assembly-Toyota Sienna 3.0L (1MZ-FE) engine



      Click image to see an enlarged view

      Fig. Removing/installing the crankshaft pulley-Toyota Sienna 3.0L (1MZ-FE) engine



      Click image to see an enlarged view

      Fig. View of the timing mark locations-Toyota Sienna 3.0L (1MZ-FE) engine



      Click image to see an enlarged view

      Fig. Timing belt alignment-Toyota Sienna 3.0L (1MZ-FE) engine



      Click image to see an enlarged view

      Fig. Timing belt tensioner installation preparation-Toyota Sienna 3.0L (1MZ-FE) engine

    36.  

    To install:

    1. Inspect the timing belt tensioner by performing the following procedures:
      1. Inspect the seal for leakage; if leakage is suspected, replace the tensioner.
      2.  
      3. Using both hands to hold the tensioner facing upward, strongly press the pushrod against a solid surface. If the pushrod moves, replace the tensioner.
        WARNING
        Never hold the tensioner with the pushrod facing downward.

      4.  
      5. Measure the pushrod protrusion from the housing end, it should be 0.394-0.425 in. (10.0-10.8mm); if the protrusion is not as specified, replace the tensioner.
      6.  

    2.  
    3. Set the No. 1 cylinder to Top Dead Center (TDC) of the compression stroke, as follows:
      1. Rotate the crankshaft (CLOCKWISE) to align the timing marks: dimple on the crankshaft timing sprocket with the notch on the oil pump body.
      2.  
      3. Check that the timing marks on the camshaft sprockets and the rear timing belt cover are aligned; if not, rotate the crankshaft 1 revolution (360 degrees) and align the marks.
      4.  

    4.  
    5. Install the timing belt in the following order:
      1. Crankshaft timing sprocket
      2.  
      3. Water pump pulley
      4.  
      5. Left camshaft timing sprocket
      6.  
      7. No. 2 idler pulley
      8.  
      9. Right camshaft sprocket
      10.  
      11. No. 1 idler pulley
      12.  

    6.  
    7. Using a vertical press, slowly press the pushrod into the housing using 200-2205 lbs. (981-9807 N) until the holes align, then, install a 1.27mm Allen® wrench to secure the pushrod and release the press. Install the dust boot on the tensioner housing.
    8.  
    9. Install the timing belt tensioner and torque the bolts to 20 ft. lbs. (27 Nm).
    10.  
    11. Remove the Allen® wrench from the tensioner housing.
    12.  
    13. Slowly, rotate the crankshaft (CLOCKWISE) 2 complete revolutions and realign the timing marks. If the timing marks do not align, remove the timing belt and reinstall it.
    14.  
    15. Remove the crankshaft pulley bolt.
    16.  
    17. Install the right side engine mounting bracket and torque the bolts to 21 ft. lbs. (28 Nm).
    18.  
    19. Clean and install the upper (No. 2) timing belt cover.
      NOTE
      If the gasket material on the timing belt covers is cracked, peeling or etc., replace it.

    20.  
    21. Install the timing belt guide on the crankshaft with the cup side facing outward.
    22.  
    23. Clean and install the lower (No. 1) timing belt cover.
      NOTE
      If the gasket material on the timing belt covers is cracked, peeling or etc., replace it.

    24.  
    25. Install the crankshaft pulley.
    26.  
    27. Using the Crankshaft Pulley Holding tool 09213-54015, Bolt tool 91651-60855 and Companion Flange Holding tool 09330-00021, or equivalent, install the crankshaft pulley bolt and torque the bolt to 159 ft. lbs. (215 Nm).
    28.  
    29. To complete the installation, reverse the removal procedures.
    30.  
    31. Connect the negative battery cable.
    32.  
    33. Start the engine and check for leaks.
    34.  

     
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