ES300 1992-1997

Camshaft & Lifters

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Inspection



Specific to:

Lexus ES250 1990-1991

Lexus ES300 1992-1999

  1. Place the camshaft on V-blocks.
  2.  
  3. Using a dial indicator, measure the circle runout at the center journal. If the circle runout is greater than maximum, replace the camshaft.

    Click image to see an enlarged view

    Fig. Inspect camshaft runout

  4.  
  5. Using a micrometer, measure the cam lobe height. If the lobe height is less than minimum, replace the camshaft.

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    Fig. Inspect cam lobe height

  6.  
  7. Using a micrometer, measure the journal diameter. If the journal diameter is not as specified, check the oil clearance.

    Click image to see an enlarged view

    Fig. Inspect camshaft journal diameter

  8.  
  9. Inspect the journal oil clearance:
    1. Clean the bearing caps and camshaft journals.
    2.  
    3. Check that bearings for flaking and scoring.
    4.  
    5. If the bearings are damaged, replace the bearing caps and cylinder head as a set.
    6.  
    7. Place the camshafts on the cylinder head.
    8.  
    9. Lay a strip of Plastigage across each of the camshaft journal.

      Click image to see an enlarged view

      Fig. Lay a strip of Plastigage across each of the camshaft journal

    10.  
    11. Install the bearing caps and tighten to specification.
      NOTE
      Do not turn the camshaft.

    12.  
    13. Remove the bearing caps.
    14.  
    15. Measure the Plastigage at its widest point. If the oil clearance is greater than maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.

      Click image to see an enlarged view

      Fig. Measure the Plastigage at its widest point

    16.  

  10.  

Removal & Installation



Specific to:

Lexus ES300 1992-1997

  1. Remove the timing belt and idler pulley.
  2.  
  3. Remove the camshaft timing pulleys.
  4.  
  5. Remove the cylinder head covers.
    NOTE
    The thrust clearance on both the intake and exhaust camshafts is very small; the camshafts must be kept level during removal. If the camshafts are removed without being kept level, the camshaft may be caught in the cylinder head causing the head to break or the camshaft to seize.

  6.  
  7. To remove the exhaust and intake camshafts from the right side cylinder head:
    1. Turn the camshaft with a wrench until the 2 pointed marks drive and driven gears are aligned. (The right camshaft gears have 2 marks apiece; the left side camshaft gears have one mark each.)

      Click image to see an enlarged view

      Fig. Aligning the right side camshaft timing marks-1993 models

    2.  
    3. Secure the exhaust camshaft sub-gear to the main gear using a service bolt. A bolt 0.63-0.79 in. (16-20mm) long with a 6mm thread diameter and a 1mm pitch is recommended. When removing the exhaust camshaft be sure the sub-gear is not loaded; all the force must be eliminated.

      Click image to see an enlarged view

      Fig. Securing the sub-gear and driven gear, right side-1993 models

    4.  
    5. Uniformly loosen and remove the exhaust camshaft bearing cap bolts in several passes and in the proper sequence. Remove the eight bearing cap bolts and remove the caps, keeping them in the correct order.

      Click image to see an enlarged view

      Fig. Right exhaust camshaft bearing loosening sequence-1993 models

    6.  
    7. Remove the exhaust camshaft from the engine.
    8.  
    9. Uniformly loosen and remove the 10 bearing cap bolts in several passes, in the proper sequence. Remove the bearing caps, keeping them in order, remove the oil seal and then lift out the intake camshaft.

      Click image to see an enlarged view

      Fig. Right intake camshaft bearing loosening sequence-1993 models

    10.  

  8.  
  9. To remove the exhaust and intake camshafts from the left side cylinder head:
    1. Turn the camshaft with a wrench until the pointed marks on the drive and driven gears are aligned. (The right camshaft gears have 2 marks apiece; the left side camshaft gears have one mark each.)

      Click image to see an enlarged view

      Fig. Aligning the left side camshaft timing marks-1993 models

    2.  
    3. Secure the exhaust camshaft sub-gear to the main gear using a service bolt. A bolt 0.63-0.79 in. (16-20mm) long with a 6mm thread diameter and a 1mm pitch is recommended. When removing the exhaust camshaft be sure the sub-gear is not loaded; all the force must be eliminated.
    4.  
    5. Uniformly loosen and remove the exhaust camshaft bearing cap bolts in several passes and in the proper sequence. Remove the eight bearing cap bolts and remove the caps. Keep the caps in the correct order.

      Click image to see an enlarged view

      Fig. Left exhaust camshaft bearing loosening sequence-1993 models



      Click image to see an enlarged view

      Fig. Left exhaust camshaft bearing removal sequence-1994-97 models

    6.  
    7. Remove the exhaust camshaft from the engine.
    8.  
    9. Uniformly loosen and remove the 10 bearing cap bolts in several passes, in the proper sequence. Remove the bearing caps, keeping them in order, remove the oil seal and then lift out the intake camshaft.

      Click image to see an enlarged view

      Fig. Left intake camshaft bearing loosening sequence-1993 models



      Click image to see an enlarged view

      Fig. Left intake camshaft bearing removal sequence-1994-97 models

    10.  

  10.  
  11. Remove the 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.
  12.  

To install:

  1. Install the valve lash adjusters into their original positions and install the shims. Check valve clearance and replace the shims as necessary.
  2.  
  3. When reinstalling, remember that the camshafts must be handled carefully and kept straight and level to avoid damage.
  4.  
  5. Before installing the camshafts in either cylinder head, apply multi-purpose grease to the thrust portions of each camshaft.
  6.  
  7. To install the right camshafts:
    1. Position the intake camshaft on the head so that the alignment marks are at a 90 degree angle from vertical. The mark should be at the 3 o'clock position.
    2.  
    3. Apply sealant to the No. 1 bearing cap.
    4.  
    5. Apply a light coat of clean engine oil to the bolt threads and under the bolt head. Install the bearing caps to their proper position. Tighten the bolts evenly and in several passes in the reverse order of loosening to 12 ft. lbs. (16 Nm) in the proper sequence.

      Click image to see an enlarged view

      Fig. Bearing cap positions, right intake camshaft-1993 models



      Click image to see an enlarged view

      Fig. Bearing cap bolt tightening sequence right intake camshaft-1994-97

    6.  
    7. Position the exhaust camshaft on the head so that the alignment marks are at a 90 degree angle from vertical. The mark should be at the 9 o'clock position and must align with the marks on the other gear.
    8.  
    9. Apply a light coat of clean engine oil to the bolt threads and under the bolt head. Install the bearing caps to their proper position. Tighten the bolts evenly and in several passes in the reverse order of loosening to 12 ft. lbs. (16 Nm) in the proper sequence.

      Click image to see an enlarged view

      Fig. Bearing cap positions, right exhaust camshaft-1993 models



      Click image to see an enlarged view

      Fig. Right exhaust camshaft bearing tightening sequence-1993 models



      Click image to see an enlarged view

      Fig. Bearing cap bolt tightening sequence right exhaust camshaft-1994-97

    10.  
    11. Remove the service bolt.
    12.  

  8.  
  9. To install the left camshafts:
    1. Position the intake camshaft on the head so that the alignment mark is at a 90 degree angle from vertical. The mark should be at the 9 o'clock position.
    2.  
    3. Apply sealant to the No. 1 bearing cap.
    4.  
    5. Apply a light coat of clean engine oil to the bolt threads and under the bolt head. Install the bearing caps to their proper position. Tighten the bolts evenly and in several passes to 12 ft. lbs. (16 Nm) in the proper sequence.

      Click image to see an enlarged view

      Fig. Bearing cap positions, left intake camshaft-1993 models



      Click image to see an enlarged view

      Fig. Bearing cap positions left intake camshaft- 1994-97



      Click image to see an enlarged view

      Fig. Left intake camshaft bearing tightening sequence-1993 models

    6.  
    7. Position the exhaust camshaft on the head so that the alignment marks are at a 90 degree angle from vertical. The mark should be at the 3 o'clock position and must align with the marks on the other gear.
    8.  
    9. Apply a light coat of clean engine oil to the bolt threads and under the bolt head. Install the bearing caps to their proper position. Tighten the bolts evenly and in several passes to 12 ft. lbs. (16 Nm) in the proper sequence.

      Click image to see an enlarged view

      Fig. Bearing cap positions, left exhaust camshaft-1993 models



      Click image to see an enlarged view

      Fig. Bearing cap positions left exhaust camshaft- 1994-97



      Click image to see an enlarged view

      Fig. Left exhaust camshaft bearing tightening sequence-1993 models

    10.  
    11. Remove the service bolt.
    12.  

  10.  
  11. Apply multi-purpose grease to new camshaft oil seals. Install the seals.
  12.  
  13. Install the No. 3 (rear) timing belt cover.
  14.  
  15. Install the camshaft timing gears.
  16.  
  17. Install the idler pulley, timing belt and covers.
  18.  
  19. Check and adjust the valve clearance.
  20.  
  21. Install the cylinder head (valve) covers.
  22.  
  23. Start the engine. Check the ignition timing.
  24.  
  25. Test drive the vehicle.
  26.  
  27. Check all fluid levels.
  28.  

 
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