Lexus Car ES, IS, LS 1998-06

Cylinder Head 3

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Removal & Installation



4.7L Engine
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2.  
  3. Drain the cooling system.
  4.  
  5. Properly relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Exhaust Y-pipe
     
    Intake manifold
     
    Valve covers
     
    Engine cooling fan and shroud
     
    Accessory drive belt
     
    Oil fill housing
     
    Power steering pump
     
    Rocker arms
     

  8.  
  9. Rotate the crankshaft so that the crankshaft timing mark aligns with the Top Dead Center (TDC) mark on the front cover, and the V8 marks on the camshaft sprockets are at 12 o-clock as shown.

    Click image to see an enlarged view

    Fig. Crankshaft timing marks-4.7L engine



    Click image to see an enlarged view

    Fig. Camshaft positioning-4.7L engine

  10.  
  11. Remove or disconnect the following:

    Crankshaft damper
     
    Front cover

    Click image to see an enlarged view

    Fig. Cylinder head access plug locations-4.7L engine



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    Fig. Use the special tool to lock the timing chains on the idler gear-4.7L engine

     

  12.  
  13. Lock the secondary timing chains to the idler sprocket with Timing Chain Locking tool 8515.
  14.  
  15. Matchmark the secondary timing chains to the camshaft sprockets.
  16.  
  17. Remove or disconnect the following:
    NOTE
    Each cylinder head is retained by ten 11mm bolts and four 8mm bolts.



    Secondary timing chain tensioners
     
    Cylinder head access plugs
     
    Secondary timing chain guides
     
    Camshaft sprockets
     
    Cylinder heads
     

  18.  

To install:

Click image to see an enlarged view

Fig. Examine the head bolts for signs of stretching-4.7L engine



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Fig. Cylinder head torque sequence-4.7L engine

  1. Check the cylinder head bolts for signs of stretching and replace as necessary.
  2.  
  3. Lubricate the threads of the 11mm bolts with clean engine oil.
  4.  
  5. Coat the threads of the 8mm bolts with Mopar® Lock and Seal Adhesive.
  6.  
  7. Install the cylinder heads. Use new gaskets and tighten the bolts, in sequence, as follows:
    1. Step 1: Bolts 1-10 to 15 ft. lbs. (20 Nm)
    2.  
    3. Step 2: Bolts 1-10 to 35 ft. lbs. (47 Nm)
    4.  
    5. Step 3: Bolts 11-14 to 18 ft. lbs. (25 Nm)
    6.  
    7. Step 4: Bolts 1-10 plus 1 / 4 (90 degree) turn
    8.  
    9. Step 5: Bolts 11-14 to 19 ft. lbs. (26 Nm)
    10.  

  8.  
  9. Install or connect the following:

    Camshaft sprockets. Align the secondary chain matchmarks and tighten the bolts to 90 ft. lbs. (122 Nm).
     
    Secondary timing chain guides
     
    Cylinder head access plugs
     
    Secondary timing chain tensioners.
     

  10.  
  11. Remove the Timing Chain Locking tool 8515.
  12.  
  13. Install or connect the following:

    Front cover
     
    Crankshaft damper. Torque the bolt to 130 ft. lbs. (175 Nm).
     
    Rocker arms
     
    Power steering pump
     
    Oil fill housing
     
    Accessory drive belt
     
    Engine cooling fan and shroud
     
    Valve covers
     
    Intake manifold
     
    Exhaust Y-pipe
     
    Negative battery cable
     

  14.  
  15. Fill and bleed the cooling system.
  16.  
  17. Start the engine, check for leaks and repair if necessary.
  18.  

 
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