Toyota Camry and Avalon 1997-2000

Camshaft, Bearings and Lifters

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REMOVAL & INSTALLATION
5S-FE Engines
  1. Remove the cylinder head cover.
  2.  


NOTE
Being that the thrust clearance on both the intake and exhaust camshafts is 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.



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Fig. Exhaust camshaft removal sequence in passes

  1. To remove the exhaust camshaft proceed as follows:
  2.  
    1. Set the knock pin of the intake camshaft at 10-45° BTDC of camshaft angle. This angle will help to lift the exhaust camshaft level and evenly by pushing No. 2 and No. 4 cylinder camshaft lobes of the exhaust camshaft toward their valve lifters.
    2.  
    3. Secure the exhaust camshaft sub-gear to the main gear using a service bolt. The manufacturer recommends a bolt 0.63-0.79 inch (16-20mm) long with a thread diameter of 6mm and a 1mm thread pitch. When removing the exhaust camshaft be sure that the torsional spring force of the sub-gear has been eliminated.
    4.  
    5. Remove the No. 1 and No. 2 rear bearing cap bolts and remove the cap. Uniformly loosen and remove bearing cap bolts No. 3 to No. 8 in several passes and in the proper sequence. Do not remove bearing cap bolts No. 9 and 10 at this time. Remove the No. 1, 2, and 4 bearing caps.
    6.  
    7. Alternately loosen and remove bearing cap bolts No. 9 and 10. As these bolts are loosened, check to see that the camshaft is being lifted out straight and level.
    8.  



NOTE
If the camshaft is not lifting out straight and level, retighten No. 9 and 10 bearing cap bolts. Reverse the order of Steps c through a and reset the intake camshaft knock pin to 10-45 ° BTDC and repeat Steps a through c again. Do not attempt to pry the camshaft from its mounting.

  1. Remove the No. 3 bearing cap and exhaust camshaft from the engine.
  2.  



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Fig. Intake camshaft removal sequence in passes

  1. To remove the intake camshaft, proceed as follows:
  2.  
    1. Set the knock pin of the intake camshaft at 80-115° BTDC of camshaft angle. This angle will help to lift the intake camshaft level and evenly by pushing No. 1 and No. 3 cylinder camshaft lobes of the intake camshaft toward their valve lifters.
    2.  
    3. Remove the No. 1 and No. 2 front bearing cap bolts and remove the front bearing cap and oil seal. If the cap will not come apart easily, leave it in place without the bolts.
    4.  
    5. Uniformly loosen and remove bearing cap bolts No. 3 to No. 8 in several phases and in the proper sequence. Do not remove bearing cap bolts No. 9 and 10 at this time. Remove No. 1, 3, and 4 bearing caps.
    6.  
    7. Alternately loosen and remove bearing cap bolts No. 9 and 10. As these bolts are loosened and after breaking the adhesion on the front bearing cap, check to see that the camshaft is being lifted out straight and level.
    8.  



NOTE
If the camshaft is not lifting out straight and level retighten No. 9 and 10 bearing cap bolts. Reverse Steps b through d, than start over from Step b. Do not attempt to pry the camshaft from its mounting.

  1. Remove the No. 2 bearing cap with the intake camshaft from the engine.
  2.  

To install:

  1. Before installing the intake camshaft, apply multi-purpose grease to the thrust portion of the camshaft.
  2.  



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Fig. Place the intake camshaft at 80-115° BTDC of the camshaft angle on the cylinder head

  1. To install the intake camshaft, proceed as follows:
  2.  
    1. Position the camshaft at 80-115° BTDC of camshaft angle on the cylinder head.
    2.  
    3. Apply sealant to the front bearing cap.
    4.  
    5. Coat the bearing cap bolts with clean engine oil.
    6.  
    7. Tighten the camshaft bearing caps evenly and in several passes to 14 ft. lbs. (19 Nm) in the proper sequence.
    8.  




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Fig. Intake bearing cap locations



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Fig. Intake bearing cap bolt tightening sequence

  1. To install the exhaust camshaft, proceed as follows:
  2.  
    1. Set the knock pin of the camshaft at 10-45° BTDC of camshaft angle.
    2.  
    3. Apply multipurpose grease to the thrust portion of the camshaft.
    4.  
    5. Position the exhaust camshaft gear with the intake camshaft gear so that the timing marks are in alignment with one another. Be sure to use the proper alignment marks on the gears. Do not use the assembly reference marks.
    6.  
    7. Turn the intake camshaft clockwise or counterclockwise little by little until the exhaust camshaft sits in the bearing journals evenly without rocking the camshaft on the bearing journals.
    8.  
    9. Coat the bearing cap bolts with clean engine oil.
    10.  
    11. Tighten the camshaft bearing caps evenly and in several passes to 14 ft. lbs. (19 Nm). Remove the service bolt from the assembly.
    12.  




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Fig. Set the knock pin of the intake camshaft at 10° BTDC of the camshaft angle



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Fig. Engage the exhaust cam gear of the intake cam gear by matching the marks



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Fig. Exhaust bearing cap locations



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Fig. Exhaust camshaft bearing cap tightening sequence

  1. Install the head cover.
  2.  
  3. Start the engine and check for leaks.
  4.  
  5. Adjust the valves and the ignition timing.
  6.  

1MZ-FE Engine
  1. Remove the timing belt and idler pulley.
  2.  
  3. Remove the camshaft timing pulleys.
  4.  



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Fig. View of the left cylinder head with exhaust (1) and intake (2) camshafts

  1. Remove the cylinder head covers.
  2.  


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.



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Fig. Place a service bolt in the camshaft sub-gear to secure it

  1. To remove the exhaust and intake camshafts from the right side cylinder head:
  2.  
    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.)
    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, keeping them in the correct order.
    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.
    10.  




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Fig. Right intake camshaft bearing cap bolt loosening sequence



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Fig. Right side exhaust camshaft bearing cap bolt loosening sequence



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Fig. Lift the caps and bolts up and place in order of removal-intake camshaft shown



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Fig. All bearing caps are marked with an E or I

  1. To remove the exhaust and intake camshafts from the left side cylinder head:
  2.  
    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.)
    2.  
    3. Secure the exhaust camshaft sub-gear to the main gear using a service bolt. A bolt 0.63-0.79 inch (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.
    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 reverse order of the installation sequence. Remove the bearing caps, keeping them in order, remove the oil seal and then lift out the intake camshaft.
    10.  




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Fig. Carefully lift the camshaft out and carry in the vertical position shown-intake camshaft shown



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Fig. Left intake camshaft bearing cap bolt loosening sequence



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Fig. Left side exhaust camshaft bearing cap bolt loosening sequence



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Fig. Removing the left side exhaust camshaft

  1. Remove the valve lifter shims and hydraulic lifters. Identify each lifter and shim as it is removed so it can be reinstalled in the same position. If the lifters are to be reused, store them upside down in a sealed container.
  2.  

To install:

  1. Install the valve lifters 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.  



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Fig. Right exhaust bearing caps must be placed in their proper locations



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Fig. Right exhaust camshaft bearing cap bolt tightening sequence

  1. Before installing the camshafts in either cylinder head, apply multi-purpose grease to each camshaft.
  2.  
  3. To install the right camshafts:
  4.  
    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 to 12 ft. lbs. (16 Nm) in the proper sequence.
    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 " 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.
    10.  
    11. Remove the service bolt.
    12.  




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Fig. Use a torque wrench to tighten the cap bolts



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Fig. Right intake bearing caps must be placed in their proper locations



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Fig. Right intake camshaft bearing cap bolt tightening sequence

  1. To install the left camshafts:
  2.  
    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.
    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.
    10.  
    11. Remove the service bolt.
    12.  




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Fig. Left exhaust bearing caps must be placed in their proper locations



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Fig. Left exhaust camshaft bearing cap bolt tightening sequence



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Fig. Left intake camshaft bearing cap bolt tightening sequence

  1. Apply multi-purpose grease to new camshaft oil seals. Install the seals.
  2.  



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Fig. The camshaft seals are on the end of the component

  1. Install the No. 3 (rear) timing belt cover.
  2.  
  3. Install the camshaft timing gears.
  4.  
  5. Install the idler pulley, timing belt and covers.
  6.  
  7. Check and adjust the valve clearance.
  8.  
  9. Install the cylinder head (valve) covers.
  10.  
  11. Start the engine. Check the ignition timing.
  12.  
  13. Test drive the vehicle.
  14.  
  15. Check all fluid levels.
  16.  

INSPECTION
Checking Camshaft Runout

Camshaft runout should be checked when the camshaft has been removed from the engine. An accurate dial indicator is needed for this procedure; engine specialists and most machine shops have this equipment. If you have access to a dial indicator, or can take your camshaft to someone who does, measure the camshaft bearing journal runout. If the runout exceeds the limit replace the camshaft.

Checking Camshaft Lobe Height

Use a micrometer to check camshaft (lobe) height, making sure the anvil and the spindle of the micrometer are positioned directly on the heel and tip of the camshaft lobe as shown in the accompanying illustration.

Checking Bearing Oil Clearance

Measure the bearing oil clearance by placing a piece of Plastigage® on each bearing journal. Replace the bearing caps and tighten the bolts to the proper torque.


NOTE
Do not turn the camshaft.



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Fig. Measuring the camshaft journal oil clearance

Remove the caps and measure each piece of Plastigage®. If the clearance is greater than the values on the Engine Mechanical Specifications chart, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.

Check the camshaft bearings for flaking and scoring. If the bearings show any signs of damage, replace the bearing caps and the cylinder head as a set.

Checking Camshaft End-Play

After the camshaft has been installed, end-play should be checked. The camshaft sprocket should not be installed on the cam. Use a dial gauge to check the end-play, by moving the camshaft forward and backward in the cylinder head. End-play specifications should be as noted in the Engine Mechanical Specifications chart.

 
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