Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Valve Lash

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As part of every major tune-up or service interval, the valve clearance should be checked and adjusted if necessary. For all pickup trucks and 4Runners covered by this guide, the specification is every 30,000 miles (48,000 km) or 36 months. For all Land Cruisers, the requirement is 15,000 miles (24,000 km) or 18 months.

If the valve clearance is too large, part of the lift of the camshaft will be used up in removing the excessive clearance, thus the valves will not be opened far enough. This condition makes the valve train noisy as they take up the excessive clearance, and the engine will perform poorly, since a smaller amount of air/fuel mixture will be admitted to the cylinders. The exhaust valves will not open far enough to vent the cylinder completely; retained pressure (back pressure) will restrict the entry of the next air/fuel charge.

If the valve clearance is too small, the intake and exhaust valves will not fully seat on the cylinder head when they close. This causes internal cylinder leakage and prevents the hot valve from transferring some heat to the head and cooling off. Therefore, the engine will run poorly (due to gases escaping from the combustion chamber), and the valves will overheat and warp (since they cannot transfer heat unless they are firmly touching the seat in the cylinder head).

One of the things to consider when adjusting valves is that on these engines, the valve adjustment is made by installing a thin wafer-like shim of the correct thickness to take up the valve lash. Each valve will require a slightly different thickness, due to manufacturing and operating tolerances in the valve train. Toyota uses numerous shims in increments of less than 0.001 inch. Only a Toyota dealer is likely to have the correct shims in an assortment covering the wide range of sizes required for accurate valve lash adjustment. In some cases, it is possible to swap shims from one cam follower to another, but it would be unusual for this to work on all of the cam followers. Valve adjustment requires an assortment of valve shims, very careful work and proficient ability with a micrometer. The valve adjustment procedure is given here, however, do NOT attempt this procedure without the proper tools and knowledge of the job.

While all valve adjustments must be as accurate as possible, it is better to have the valve adjustment slightly loose than slightly tight, as burnt valves may result from overly tight adjustments.



Click image to see an enlarged view

Fig. Adjusting shim chart for the intake valves



Click image to see an enlarged view

Fig. Adjusting shim chart for the exhaust valves

ADJUSTMENT



2RZ-FE and 3RZ-FE Engines

Toyota's Valve Adjustment Special Service Tools (SST), or their equivalent, are required for this procedure. The valve adjusting shims are set inside bucket-like cam followers. Part of the Toyota SST Valve Adjust Tool Set is a pliers-like tool to press down on the cam follower (also called a valve lifter) for enough clearance to withdraw the shim, and a lever-like tool that fits between the camshaft and the valve lifter flange to hold that clearance for shim extraction and insertion. In addition, a magnet to remove the adjustment shim from the cam follower and an accurate micrometer is required to properly measure the valve shim thickness. If all of these items are not available, valve adjustment is NOT recommended.

Only adjust the valve clearance when the engine is cold.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cylinder head (valve) cover.
  4.  
  5. Turn the crankshaft pulley clockwise and align its groove with the timing mark 0 of the timing chain cover. If all of the spark plugs are removed, it will be easier to turn the engine by hand.
  6.  



Click image to see an enlarged view

Fig. Align the timing marks at the crankshaft pulley. Verify that the marks (one and two dots) on the camshaft drive and driven gears are in a straight line2RZ-FE and 3RZ-FE Engines

  1. Check that the timing marks (one and two dots) on the camshaft drive and driven gears are in a straight line on the cylinder head surface. If not, turn the crankshaft one complete revolution (360 degrees). This should be Top Dead Center (TDC) for cylinder No. 1.
  2.  
  3. Using an accurate feeler gauge, measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves on cylinder No. 1 and 2. Measure the exhaust valves at cylinder No. 1 and 3.
    1. The intake valve clearance cold should be 0.0060.010 in. (0.150.25mm).
    2.  
    3. The exhaust valve clearance cold should be 0.0100.014 in. (0.250.35mm).
    4.  

  4.  
  5. Turn the crankshaft pulley exactly 1 complete revolution (360 degrees) and align the pulley groove with the timing mark 0 on the timing chain cover. This should now be Top Dead Center for cylinder No. 4.
  6.  



Click image to see an enlarged view

Fig. Intake valves No. 1 and 2 and exhaust valves No. 1 and 32RZ-FE and 3RZ-FE Engines



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Fig. Intake valves No. 3 and 4 and exhaust valves No. 2 and 42RZ-FE and 3RZ-FE Engines

  1. Measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves for cylinder No. 3 and 4. Measure the exhaust valves at the cylinder No. 2 and 4.
    1. The intake valve clearance cold should be 0.0060.010 in. (0.150.25mm).
    2.  
    3. The exhaust valve clearance cold is 0.0100.014 in. (0.250.35mm).
    4.  

  2.  



Click image to see an enlarged view

Fig. Turn the crankshaft clockwise to position the cam lobe of the valve to be adjusted, upward. Rotate the notch in the valve lifter to face the spark plug side2RZ-FE and 3RZ-FE Engines

  1. To adjust the intake valve clearance:
    1. Turn the crankshaft to position the cam lobe of the valve to be adjusted, facing upward.
    2.  
    3. Look closely for a notch in the valve lifter. Position the notch of the valve lifter toward the spark plug side.
    4.  
    5. Using the pliers-like Toyota SST tool, press down on the valve lifter and place the lever-like part of the SST valve adjusting tool set between the camshaft and valve lifter flange. The tip on the lever should fit into the notch in the valve lifter. With the valve lifter retained in this way, remove the pliers-like tool.
    6.  
    7. Using a small flat-bladed tool and a magnet, remove the adjusting shim.
    8.  
    9. Using an accurate micrometer, measure the thickness of the removed shim.
    10.  
    11. Calculate the thickness of a new shim so that the valve clearance comes within the specified value. Determine the replacement adjusting shim size by either using the chart or the following formula:

      IntakeN=T+(A-0.008 in./0.20mm)
       
      ExhaustN=T+(A-0.012 in./0.30mm)
       
      T=Thickness of removed shim
       
      A=Measured valve clearance
       
      N=Thickness of new shim
       

    12.  
    13. Select a new shim with a thickness as close as possible to the calculated value.
    14.  

  2.  
  3. Place a new adjusting shim on the valve lifter. Using the pliers-like Special Service Tool, press down on the valve lifter and remove the lever-like tool.
  4.  
  5. With feeler gauges, recheck the valve clearance.
  6.  



Click image to see an enlarged view

Fig. These special tools are required for valve adjustment



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Fig. Apply the SST ( B ) at a slight angle on the side marked with a 9 , at the position shown in the illustration2RZ-FE and 3RZ-FE Engines

  1. The same procedures and tools are used for both intake and exhaust valve lifter adjustment.
  2.  
  3. When satisfied that all lifter clearances are correct, reinstall the cylinder head (valve) cover.
  4.  
  5. Connect the spark plug wires and any wiring removed or displaced for cylinder head cover removal.
  6.  
  7. Connect the remaining components such as PCV hoses and intake air connector.
  8.  
  9. Check engine oil level and connect the negative battery cable.
  10.  

5VZ-FE Engine

Adjust the valves when the engine is cold.

Toyota's Special Service Tools (SST) for valve adjustment, or their equivalent, are required for this procedure. The valve adjusting shims are set inside bucket-like cam followers. Part of the Toyota SST Valve Adjust Tool Set is a pliers-like tool to press down on the cam follower (also called a valve lifter) for enough clearance to withdraw the shim, and a lever-like tool that fits between the camshaft and the valve lifter flange to hold that clearance for shim extraction and insertion. In addition, a magnet to remove the adjustment shim from the cam follower and an accurate micrometer is required to properly measure the valve shim thickness. If all of these items are not available, valve adjustment is NOT recommended.

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Remove the intake air connector.
  6.  
  7. Remove the cylinder head (valve) covers.
  8.  
  9. Turn the crankshaft pulley clockwise and align its groove with the timing mark 0 of the timing belt cover. If all of the spark plugs are removed, it will be easier to turn the engine by hand.
  10.  



Click image to see an enlarged view

Fig. Align the timing marks at the crankshaft pulley. Verify that the dot marks on the camshaft drive and driven gears are in a straight line5VZ-FE Engine

  1. Check that the timing marks (1 dot) on the camshaft drive and driven gears are in a straight line on the cylinder head surface. If not, turn the crankshaft 1 complete revolution (360 degrees). This should be Top Dead Center for cylinder No. 1.
  2.  

The cylinder layout for this V6 engine is: Right Cylinder Bank1-3-5; Left Cylinder Bank2-4-6. All cylinders are numbered starting at the front (timing belt end). Remember that this is a four-valve per cylinder engine. That means two intake and two exhaust valves per cylinder.

  1. Step 1: Using an accurate feeler gauge, measure the clearance between the valve lifters and the camshaft. Record the measurements for the following valves:
  2.  



Click image to see an enlarged view

Fig. Adjust these valves in the first step5VZ-FE Engine

  1. Both Intake Valves on cylinder No. 1Right Hand Side
  2.  
  3. Both Exhaust Valves on cylinder No. 2Left Hand Side.
  4.  
  5. Both Exhaust Valves on cylinder No. 3Right Hand Side.
  6.  
  7. Both Intake Valves on cylinder No. 6Left Hand Side.
  8.  
  9. The intake valve clearance cold should be 0.0060.009 in. (0.130.23mm).
  10.  
  11. The exhaust valve clearance cold should be 0.0110.014 in. (0.270.37mm).
  12.  



Click image to see an enlarged view

Fig. Adjust these valves in the second step5VZ-FE Engine

  1. Step 2: Turn the crankshaft clockwise 2 / 3 of a revolution (240 degrees). Using an accurate feeler gauge, measure the clearance between the valve lifters and the camshaft. Record the measurements for the following valves:
    1. Both Intake Valves on cylinder No. 2Left Hand Side.
    2.  
    3. Both Intake Valves on cylinder No. 3Right Hand Side.
    4.  
    5. Both Exhaust Valves on cylinder No. 4Left Hand Side.
    6.  
    7. Both Exhaust Valves on cylinder No. 5Right Hand Side.
    8.  
    9. The intake valve clearance cold should be 0.0060.009 in. (0.130.23mm).
    10.  
    11. The exhaust valve clearance cold should be 0.0110.014 in. (0.270.37mm).
    12.  

  2.  
  3. Step 3: Turn the crankshaft clockwise a further 2 / 3 of a revolution (240 degrees). Using an accurate feeler gauge, measure the clearance between the valve lifters and the camshaft. Record the measurements for the following valves:
  4.  



Click image to see an enlarged view

Fig. Adjust these valves in the third step5VZ-FE Engine

  1. Both Exhaust Valves on cylinder No. 1Right Hand Side.
  2.  
  3. Both Intake Valves on cylinder No. 4Left Hand Side.
  4.  
  5. Both Intake Valves on cylinder No. 5Right Hand Side.
  6.  
  7. Both Exhaust Valves on cylinder No. 6Left Hand Side.
  8.  
  9. The intake valve clearance cold should be 0.0060.009 in. (0.130.23mm).
  10.  
  11. The exhaust valve clearance cold should be 0.0110.014 in. (0.270.37mm).
  12.  



Click image to see an enlarged view

Fig. With the cam lobe facing upward, turn the lifter so the notches are perpendicular to the camshaft5VZ-FE Engine



Click image to see an enlarged view

Fig. Using the Toyota Special Service Tools to remove the valve lifter shims5VZ-FE Engine

  1. To adjust the intake valve clearance:
    1. Turn the crankshaft to position the cam lobe of the valve to be adjusted, facing upward.
    2.  
    3. Look closely for a notch in the valve lifter. Position the notch of the valve lifter so it is perpendicular to the camshaft.
    4.  
    5. Using the pliers-like Toyota SST tool, press down on the valve lifter and place the lever-like part of the SST valve adjusting tool set between the camshaft and valve lifter flange. The tip on the lever should fit into the notch in the valve lifter. Use care. If the tip of the tool is inserted too deeply, the shim will pinch it. To prevent it from being stuck, insert it gently from the intake side, at a slight angle. With the valve lifter retained in this way, remove the pliers-like tool.
    6.  
    7. Using a small flat-bladed tool and a magnet, remove the adjusting shim.
    8.  
    9. Using an accurate micrometer, measure the thickness of the removed shim.
    10.  

  2.  
  3. Determine the replacement adjusting shim size by either using charts or the following formula:

    IntakeN=T+(A-0.007 in./0.18mm)
     
    ExhaustN=T+(A-0.013 in./0.32mm)
     
    T=Thickness of removed shim
     
    A=Measured valve clearance
     
    N=Thickness of new shim
     

  4.  
  5. Select a new shim with the thickness as close as possible to the calculated value.
  6.  
  7. Place the new adjusting shim on the valve lifter, with the imprinted numbers facing down. Using the pliers-like Special Service Tool, press down on the valve lifter and remove the lever-like tool.
  8.  
  9. With feeler gauges, recheck the valve clearance.
  10.  
  11. The same procedures and tools are used for both intake and exhaust valve lifter adjustment.
  12.  
  13. When satisfied that all lifter clearances are correct, reinstall the cylinder head covers.
  14.  
  15. Connect the spark plug wires and any wiring removed or displaced for cylinder head cover removal.
  16.  
  17. Connect the remaining components such as the intake air connector.
  18.  
  19. Refill the engine with coolant.
  20.  
  21. Check engine oil level and connect the negative battery cable.
  22.  

1FZ-FE Engine

Toyota's Special Service Tools (SST) for valve adjustment, or their equivalent, are required for this procedure. The valve adjusting shims are set inside bucket-like cam followers. Part of the Toyota SST Valve Adjust Tool Set is a pliers-like tool to press down on the cam follower (also called a valve lifter) for enough clearance to withdraw the shim, and a lever-like tool that fits between the camshaft and the valve lifter flange to hold that clearance for shim extraction and insertion. In addition, a magnet to remove the adjustment shim from the cam follower and an accurate micrometer is required to properly measure the valve shim thickness. If all of these items are not available, valve adjustment is NOT recommended.

Adjust the valves when the engine is cold.

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Remove the throttle body. For additional information, please refer to the following topic(s): Fuel System, Throttle Body.
  6.  
  7. Disconnect the engine wires and heater valve from their locations on the cowl panel.
  8.  
  9. Remove the spark plug cables.
  10.  
  11. Remove the cylinder head (valve) covers.
  12.  
  13. Turn the crankshaft pulley clockwise and align its groove with the timing mark 0 of the timing belt cover. If all of the spark plugs are removed, it will be easier to turn the engine by hand.
  14.  



Click image to see an enlarged view

Fig. Disconnect the engine wires and heater valve from the cowl panel and remove the cylinder head cover1FZ-FE Engine



Click image to see an enlarged view

Fig. Align the timing marks at the crankshaft pulley. Verify that the timing marks (one and two dots) on the camshaft drive and driven gears are in a straight line1FZ-FE Engine

  1. Turn the crankshaft pulley clockwise and align its groove with the timing mark 0 of the timing chain cover. If all of the spark plugs are removed, it will be easier to turn the engine by hand.
  2.  
  3. Check that the timing marks (one and two dots) on the camshaft drive and driven gears are in a straight line on the cylinder head surface. If not, turn the crankshaft one complete revolution (360 degrees). This should be Top Dead Center for cylinder No. 1.
  4.  

The cylinder layout for this Inline Six Cylinder is: 1-2-3-4-5-6. Cylinders are numbered starting at the front (timing chain end). Remember that this is a four-valve per cylinder engine. That means two intake and two exhaust valves per cylinder.

  1. Step 1: Using an accurate feeler gauge, measure the clearance between the valve lifters and the camshaft. Record the measurements for the following valves:
    1. Both Intake and Both Exhaust Valves on cylinder No. 1
    2.  
    3. Both Intake Valves on cylinder No. 2
    4.  
    5. Both Exhaust Valves on cylinder No. 3
    6.  
    7. Both Intake Valves on cylinder No. 4
    8.  
    9. Both Exhaust Valves on cylinder No. 5
    10.  
    11. The intake valve clearance cold should be 0.0060.010 in. (0.150.25mm).
    12.  
    13. The exhaust valve clearance cold should be 0.0100.014 in. (0.250.35mm).
    14.  

  2.  



Click image to see an enlarged view

Fig. Check these valves first1FZ-FE Engine

  1. Now, turn the crankshaft pulley clockwise one complete revolution (360 degrees) and align its groove with the timing mark 0 of the timing chain cover. This should be Top Dead Center for cylinder No. 6.
  2.  
  3. Step 2: Using an accurate feeler gauge, measure the clearance between the valve lifters and the camshaft. Record the measurements for the following valves:
    1. Both Exhaust Valves on cylinder No. 2
    2.  
    3. Both Intake Valves on cylinder No. 3
    4.  
    5. Both Exhaust Valves on cylinder No. 4
    6.  
    7. Both Intake Valves on cylinder No. 5
    8.  
    9. Both Intake and Both Exhaust Valves on cylinder No. 6
    10.  
    11. The intake valve clearance cold should be 0.0060.010 in. (0.150.25mm).
    12.  
    13. The exhaust valve clearance cold should be 0.0100.014 in. (0.250.35mm).
    14.  

  4.  



Click image to see an enlarged view

Fig. Check these valves second1FZ-FE Engine

The following procedure applies to all valves EXCEPT the rear valves for No. 6 cylinder.



Click image to see an enlarged view

Fig. Using Toyota's Special Service Tools to remove the valve adjusting shims1FZ-FE Engine

  1. To adjust the valve clearance:
    1. Turn the crankshaft to position the cam lobe of the valve to be adjusted, facing upward.
    2.  
    3. Look closely for a notch in the valve lifter. Position the notch of the valve lifter toward the spark plug side.
    4.  
    5. Using the pliers-like Toyota SST tool, press down on the valve lifter and place the lever-like part of the SST valve adjusting tool set between the camshaft and valve lifter flange. The tip on the lever should fit into the notch in the valve lifter. Use care. If the tip of the tool is inserted too deeply, the shim will pinch it. To prevent it from being stuck, insert it shallowly from the outside of the cylinder head, at a slight angle. With the valve lifter retained in this way, remove the pliers-like tool.
    6.  
    7. Using a small flat-bladed tool and a magnet, remove the adjusting shim.
    8.  
    9. Using an accurate micrometer, measure the thickness of the removed shim.
    10.  

  2.  
  3. Determine the replacement adjusting shim size by either using charts or the following formula:

    IntakeN=T+(A-0.008 in./0.20mm)
     
    ExhaustN=T+(A-0.012 in./0.30mm)
     
    T=Thickness of removed shim
     
    A=Measured valve clearance
     
    N=Thickness of new shim
     

  4.  
  5. Select a new shim with the thickness as close as possible to the calculated value.
  6.  
  7. Place the new adjusting shim on the valve lifter, with the imprinted numbers facing down. Using the pliers-like Special Service Tool, press down on the valve lifter and remove the lever-like tool.
  8.  
  9. With feeler gauges, recheck the valve clearance.
  10.  
  11. The same procedures and tools are used for both intake and exhaust valve lifter adjustment.
  12.  

The following procedure applies to ONLY THE REAR VALVES for No. 6 cylinder.

  1. To adjust the rear valves on No. 6 cylinder:
    1. Remove the distributor.
    2.  
    3. Remove the camshafts; refer to the following topics: Engine Mechanical, Camshafts.
    4.  
    5. Remove the valve adjusting shim and measure using the formula given above. Select the proper replacement valve shim.
    6.  
    7. Install the new shim. Make sure it is seated properly.
    8.  
    9. Install the camshafts.
    10.  
    11. Recheck the valve clearance.
    12.  
    13. Install the distributor.
    14.  

  2.  
  3. When satisfied that all lifter clearances are correct, reinstall the cylinder head cover.
  4.  
  5. Connect the spark plug wires and any wiring removed or displaced for cylinder head cover removal.
  6.  
  7. Connect the remaining components such as the throttle body.
  8.  
  9. Refill the engine with coolant.
  10.  
  11. Check engine oil level and connect the negative battery cable.
  12.  
  13. Run the engine to check for leaks and, if the distributor was removed, to adjust the ignition timing.
  14.  

2UZ-FE Engine

The procedure should be done while the engine is cold.

  1. Drain the engine coolant.
  2.  
  3. Remove the battery clamp cover.
  4.  
  5. Remove the V-bank cover.
  6.  
  7. Remove the air cleaner and duct assembly.
  8.  
  9. Remove the No. 3 timing belt covers.
  10.  
  11. Remove the ignition coils.
  12.  
  13. Remove the cylinder head covers.
  14.  
  15. Turn the crankshaft so the No. 1 piston is at TDC on compression (1st position). Be sure the camshaft timing marks align with the marks on the rear covers.
  16.  
  17. Measure the clearance with a feeler gauge of the valves indicated and record the measurement of any valve out of specification.

    Intake0.0060.010 inch (0.150.25mm)
     
    Exhaust0.0100.014 inch (0.250.35mm)
     

  18.  
  19. Turn the crankshaft one revolution and measure the clearance of the valves indicated (2nd position). Record the measurement of any valves out of specification.
  20.  



Click image to see an enlarged view

Fig. Measure the clearance of the valves indicated while the crankshaft is in the 1st position2UZ-FE engine



Click image to see an enlarged view

Fig. Turn the crankshaft one revolution and measure the clearance of the valves shown-this is the 2nd position2UZ-FE engine

The camshafts must be removed to allow access to the adjusting shims.

  1. Remove the timing belt and camshafts.
  2.  
  3. Remove the valve lifter and adjusting shim.
  4.  
  5. Using a micrometer, measure the thickness of the removed shim. Calculate the thickness of a new shim so that the valve clearance comes within the specified value.
  6.  
  7. Determine the size of the replacement shim by using the following formula, or the adjusting shim charts.

    T = Thickness of the removed shim
     
    A = Measured valve clearance
     
    N = Thickness of the new shim
     

  8.  
    1. Intake: N = T + (A - 0.008 in. (0.20mm))
    2.  
    3. Exhaust: N = T + (A - 0.012 in. (0.30mm))
    4.  

  9. Install the lifter with the new shim.
  10.  
  11. Install the camshafts and timing belt.
  12.  
  13. Recheck the valve clearance.
  14.  
  15. Install the cylinder head covers.
  16.  
  17. Install the ignition coils and the No. 3 timing belt covers.
  18.  
  19. Install the air cleaner and duct assembly.
  20.  
  21. Refill the cooling system.
  22.  
  23. Start the engine and check for leaks.
  24.  
  25. Install the V-bank cover.
  26.  
  27. Recheck the coolant level.
  28.  
  29. Install the battery clamp cover.
  30.  



Click image to see an enlarged view

Fig. Intake valve clearance shim selection chart2UZ-FE engine



Click image to see an enlarged view

Fig. Exhaust valve clearance shim selection chart2UZ-FE engine

 
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