Lexus GS, SC 1998-06

Camshaft, Bearings & Lifters 3

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Removal & Installation



3.0L (2jz-GE) Engine


Click image to see an enlarged view

Fig. Removing the camshaft sprockets-3.0L (2JZ-GE) engine

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable from the battery
     
    Timing belt from the engine
     
    Cylinder head covers
     
    Camshaft sprocket
     
    4 bolts and lift out the No. 4 (inner) timing belt cover.
     
    No. 1 camshaft bearing cap bolts. These are the bolts directly behind the sprockets.
     
    Bearing caps
     


    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt removal sequence-3.0L (2JZ-GE) engine

    Remaining bearing cap bolts. Note that there are separate sequences for the exhaust and intake camshafts. Lift off all 12 bearing caps.
     
    Exhaust and intake camshafts
     
    Valve lash adjuster shims and hydraulic lash adjusters. Identify each lash adjuster and shim as it is removed so it can be reinstalled in the same position. If the lash adjusters are to be reused, store them upside down in a sealed container.
     

  4.  

To install:

  1. Install or connect the following:

    Valve lash adjusters and shims. Check valve clearance and replace the shims as necessary.
     
    Camshafts. Coat the thrust portions of each with engine oil, then position them in the cylinder head with the cam lobes and the knock pins in the correct position.
     
    No. 3 and No. 7 bearing caps in place, coat the bolt threads with oil, then tighten them temporarily
     


    Click image to see an enlarged view

    Fig. Installing No. 3 and 7 bearing caps-3.0L (2JZ-GE) engine

    New oil seals, coated with multi-purpose grease, over the camshafts
     
    No. 1 bearing caps, then apply some sealant. Install the bolts.
     


    Click image to see an enlarged view

    Fig. Applying sealant to the No. 1 bearing cap-3.0L (2JZ-GE) engine

    All remaining bearing caps. Coat the threads of each bolt with clean oil, then tighten them, in several passes, in sequence, to 14 ft. lbs. (20 Nm). Note that there are separate sequences for the intake and exhaust sides.
     


    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt tightening sequence-3.0L (2JZ-GE) engine

    Oil seal in as far as it will go
     

  2.  
  3. Rotate each camshaft until the forward straight (knock) pin is straight up. Loosen exhaust Nos. 1, 2 and 6 bearing cap bolts until they can be turned by hand; retighten them to 14 ft. lbs. (20 Nm). Loosen intake Nos. 1 and 2 and retighten to 14 ft. lbs. (20 Nm).
  4.  
  5. Turn each camshaft/of a revolution (120 degrees). Loosen exhaust Nos. 4 and 7 bearing cap bolts; retighten them to 14 ft. lbs. (20 Nm). Loosen intake Nos. 4 and 6 bearing cap bolts; retighten them to 14 ft. lbs. (20 Nm).13
  6.  
  7. Turn each camshaft an additional/of a revolution, loosen exhaust bearing cap bolts Nos. 3 and 5, then retighten them to 14 ft. lbs. (20 Nm). Loosen intake bearing cap bolts Nos. 3 and 7, then retighten them to 14 ft. lbs. (20 Nm).13
  8.  
  9. Check and adjust the valve clearance.
  10.  
  11. Install or connect the following:

    No. 4 inside timing belt cover and the camshaft pulleys. Align the shaft pin with the pulley groove and slide the pulley on. Install the bolt temporarily. Hold the hex portion of the camshaft with a wrench; tighten the pulley bolt to 59 ft. lbs. (79 Nm).
     
    Cylinder head covers
     
    Timing belt to the engine
     
    Negative battery cable to the battery
     

  12.  
  13. Check and/or adjust the ignition timing as necessary
  14.  


    Click image to see an enlarged view

    Fig. Tightening the camshafts (Step 1)-3.0L (2JZ-GE) engine



    Click image to see an enlarged view

    Fig. Tightening the camshafts (Step 2)-3.0L (2JZ-GE) engine



    Click image to see an enlarged view

    Fig. Tightening the camshafts (Step 3)-3.0L (2JZ-GE) engine


  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable from the battery
     
    Timing belt from the engine
     
    Cylinder head covers
     

  4.  
  5. Make reference marks on the timing belt to the crankshaft and idler pulley timing marks.
  6.  
  7. Remove the timing belt. See TIMING BELT.
  8.  


WARNING
Do NOT allow anything to drop into the lower part of the timing belt cover. Do NOT allow the timing belt to come in contact with any oil, water or dust.

  1. Remove both the exhaust and intake camshaft pulleys. See procedure under TIMING BELT.
  2.  


WARNING
Since the thrust clearance of the camshaft is small, the camshaft must be kept level during removal. If not, the portion of the cylinder head receiving the camshaft thrust may crack or be otherwise damaged, causing the camshaft to later seize or break. Follow the camshaft removal procedure carefully as given in this section.

  1. With a 5mm hex wrench, remove the No. 3 camshaft bearing cap bolts. Then, uniformly loosen and remove the 4 camshaft bearing cap bolts, located just rear of the camshaft pulley locations.
  2.  
  3. Carefully pry out the No. 1 and No. 3 camshaft bearing caps and oil seals.
  4.  
  5. Uniformly loosen and remove the 12 camshaft bearing cap bolts, in several passes, and following the sequence illustrated. Remove the 6 No. 2 bearing caps and the camshafts from the engine.
  6.  


    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt loosening sequence-3.0L (2JZ-GE) Engine (2004 Model)


To install:

  1. Apply engine oil to the thrust portion of the camshaft.
  2.  
  3. Place the camshaft into the cylinder head, with the cam lobe facing up (cam lobe mark on the exhaust camshaft will be at about 11 o-clock and the cam lobe mark on the intake camshaft will be at 3 o-clock).
  4.  
  5. Place the No. 3 and No. 7 camshaft journal bearing caps into their positions. Apply engine oil onto thread and under the heads of the bearing cap bolts. Temporarily tighten these bearing cap bolts, uniformly and alternately, until they are snug with the cylinder head.
  6.  
  7. Apply grease to new camshaft oil seal lip. Install both oil seals onto the camshafts.
  8.  
  9. Clean the installed surface of the No. 1 and No. 3 camshaft bearing caps and cylinder head. Apply seal packing along outer edge of bearing cap, outside of the bolt hole.
  10.  
  11. Install the other bearing caps in proper locations. Apply a light coat of engine oil to bolt threads and under the bolt heads. Install and uniformly tighten the 14 bearing cap bolts on one side, in several passes, following sequence shown. Torque these bolts to 15 ft. lbs. (20 Nm).
  12.  
  13. Using a 5mm hex wrench, tighten bearing cap bolts for caps No. 2 and No. 3 to 44 inch lbs. (5 Nm).
  14.  
  15. With a special oil seal driver, install the 2 oil seals as far as possible by pushing from front end of camshafts.
  16.  
  17. Rotate camshaft with a wrench on the hex section and bring the forward straight pin up to the 12 o-clock position. Loosen the 12 bearing cap bolts, highlighted in the Step 1 figure, until bolts are just finger-tight. Now, retighten these bolts, in several passes, to 15 ft. lbs. (20 Nm).
  18.  
  19. Turn camshaft 1/3 of a revolution clockwise, so straight pin is at about the 4 o-clock position. Now, loosen the 8 bolts, as highlighted in Step 2 illustration, until they are just finger-tight. Now, retighten these bolts, in several passes, to 15 ft. lbs. (20 Nm).
  20.  
  21. Turn the camshaft an additional 1/3 of a revolution, so the straight pin in now at about the 8 o-clock position. Loosen the 8 bearing cap bolts, as highlighted in Step 3 illustration, until they are just finger-tight. Now, retighten these bolts, in several passes, to 15 ft. lbs. (20 Nm).
  22.  
  23. Check and adjust the valve lash. See VALVE LASH
  24.  
  25. Install the No. 4 timing belt cover.
  26.  
  27. Align the exhaust camshaft knock pin with the groove in the camshaft pulley and slide on the pulley. Ensure the front mark is forward. Hold the hex portion of the exhaust camshaft and tighten the exhaust pulley center bolt to 60 ft. lbs. (81 Nm).
  28.  
  29. Align the intake camshaft knock pin with the groove in the camshaft pulley and slide the pulley into place until it touches bottom. Check that outer circumference of the intake pulley rotates easily through 30°.
  30.  
  31. Holding the hex portion of the intake camshaft, install and tighten the intake camshaft pulley bolt to 60 ft. lbs. (81 Nm). Using a 14mm hex wrench, install the straight screw plug, with a seal washer to the set bolt. Torque it to 11 ft. lbs. (15 Nm).
  32.  
  33. Align the dot mark on the intake camshaft pulley with the timing mark of the No. 4 timing belt cover.
  34.  
  35. Reinstall the timing belt, making sure its position on the crankshaft pulley does not change, and that the marks made on the timing belt line up with the camshaft pulley timing marks.
  36.  
  37. Clean any old packing material from outside of the 2 rearmost bearing caps and install new packing in its place.
  38.  
  39. Reinstall remaining components in reverse of the removal procedure.
  40.  


    Click image to see an enlarged view

    Fig. Installing packing onto camshaft bearing caps-3.0L (2JZ-GE) Engine (2004 Model)



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt tightening sequence-3.0L (2JZ-GE) Engine (2004 Model)



    Click image to see an enlarged view

    Fig. Retightening camshaft bearing cap bolts, Step 1-3.0L (2JZ-GE) Engine (2004 Model)



    Click image to see an enlarged view

    Fig. Retightening camshaft bearing cap bolts, Step 2-3.0L (2JZ-GE) Engine (2004 Model)




Click image to see an enlarged view

Fig. Removing the camshaft sprockets-3.0L (2JZ-GE) engine

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable from the battery
     
    Timing belt from the engine
     
    Cylinder head covers
     
    Camshaft sprocket
     
    4 bolts and lift out the No. 4 (inner) timing belt cover.
     
    No. 1 camshaft bearing cap bolts. These are the bolts directly behind the sprockets.
     
    Bearing caps

    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt removal sequence-3.0L (2JZ-GE) engine

     
    Remaining bearing cap bolts. Note that there are separate sequences for the exhaust and intake camshafts. Lift off all 12 bearing caps.
     
    Exhaust and intake camshafts
     
    Valve lash adjuster shims and hydraulic lash adjusters. Identify each lash adjuster and shim as it is removed so it can be reinstalled in the same position. If the lash adjusters are to be reused, store them upside down in a sealed container.
     

  4.  

To install:

  1. Install or connect the following:

    Valve lash adjusters and shims. Check valve clearance and replace the shims as necessary.
     
    Camshafts. Coat the thrust portions of each with engine oil, then position them in the cylinder head with the cam lobes and the knock pins in the correct position.
     
    No. 3 and No. 7 bearing caps in place, coat the bolt threads with oil, then tighten them temporarily.

    Click image to see an enlarged view

    Fig. Installing No. 3 and 7 bearing caps-3.0L (2JZ-GE) engine

     
    New oil seals, coated with multi-purpose grease, over the camshafts
     
    No. 1 bearing caps, then apply some sealant. Install the bolts.

    Click image to see an enlarged view

    Fig. Applying sealant to the No. 1 bearing cap-3.0L (2JZ-GE) engine

     
    All remaining bearing caps. Coat the threads of each bolt with clean oil, then tighten them, in several passes, in sequence, to 14 ft. lbs. (20 Nm). Note that there are separate sequences for the intake and exhaust sides.

    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt tightening sequence-3.0L (2JZ-GE) engine

     
    Oil seal in as far as it will go
     

  2.  
  3. Rotate each camshaft until the forward straight (knock) pin is straight up. Loosen exhaust Nos. 1, 2 and 6 bearing cap bolts until they can be turned by hand; retighten them to 14 ft. lbs. (20 Nm). Loosen intake Nos. 1 and 2 and retighten to 14 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Tightening the camshafts (Step 1)-3.0L (2JZ-GE) engine

  4.  
  5. Turn each camshaft 1 / 3 of a revolution (120 degrees). Loosen exhaust Nos. 4 and 7 bearing cap bolts; retighten them to 14 ft. lbs. (20 Nm). Loosen intake Nos. 4 and 6 bearing cap bolts; retighten them to 14 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Tightening the camshafts (Step 2)-3.0L (2JZ-GE) engine

  6.  
  7. Turn each camshaft an additional 1 / 3 of a revolution, loosen exhaust bearing cap bolts Nos. 3 and 5, then retighten them to 14 ft. lbs. (20 Nm). Loosen intake bearing cap bolts Nos. 3 and 7, then retighten them to 14 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Tightening the camshafts (Step 3)-3.0L (2JZ-GE) engine

  8.  
  9. Check and adjust the valve clearance.
  10.  
  11. Install or connect the following:

    No. 4 inside timing belt cover and the camshaft pulleys. Align the shaft pin with the pulley groove and slide the pulley on. Install the bolt temporarily. Hold the hex portion of the camshaft with a wrench; tighten the pulley bolt to 59 ft. lbs. (79 Nm).
     
    Cylinder head covers
     
    Timing belt to the engine
     
    Negative battery cable to the battery
     

  12.  
  13. Check and/or adjust the ignition timing as necessary
  14.  

 
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