Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Rocker Arm/Shafts

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REMOVAL & INSTALLATION



Only the 22R, 22R-E and 3F-E engines use rocker arms. Other engines operate the valves through the direct action of the camshaft.

22R and 22R-E Engines

See Figures 1 though 5


WARNING
The rocker shaft assembly is held by the head bolts. Removal of the head to replace the head gasket is REQUIRED any time the head bolts are loosened. Refer to cylinder head removal and installation later in this section. NEVER attempt to re-compress the same gasket after the head bolts are loosened.

  1. Remove the valve cover. The head bolts must be loosened in the correct order to avoid head damage. Refer to the cylinder head removal and installation procedure in this section. Once the bolts are loosened and removed, carefully remove the rocker shaft assembly.
  2.  

It may be necessary to use gentle prying force at the ends of the assembly to lift it off the head. Do not damage the head during removal.

Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the 22R and 22R-E rocker arms and shafts



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Fig. Fig. 2: After the head bolts are removed ...

  1. Remove the three retaining screws and slide the rocker supports, springs and rocker arms off of the shafts. Keep all parts in order; the shafts must be reassembled in the correct order.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: ... the rocker shaft assembly can be lifted from the head

  1. Inspect the rocker arm-to-shaft wear by wiggling the arm laterally on the shaft. Little or no movement should be felt.
  2.  
  3. If movement is found in the arm-to-shaft wiggle test, measure the oil clearance as follows:
    1. Measure the outside diameter of the rocker shaft with a micrometer.
    2.  
    3. Measure the inside diameter of the rocker arms with a dial indicator.
    4.  
    5. The difference between the rocker arm inner diameter and the shaft outer diameter is the oil clearance. Correct clearance is 0.0004-0.0020 inches (0.01-0.05 mm). Maximum allowable clearance is 0.0031 inches (0.08 mm).
    6.  

  4.  



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Fig. Fig. 4: Wiggle the rocker arm on the shaft to check for excessive free-play



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Fig. Fig. 5: Measure the rocker inner diameter and the shaft outer diameter to determine the oil clearance

  1. Inspect the face of each rocker; the surface should be smooth, shiny and evenly shaped. Any sign of metal wear or scratching requires replacement of the rocker and a detailed inspection of the camshaft.
  2.  

The condition of the rocker surfaces and matching camshaft lobes are your report card for oil and filter changes. If you have been less than prompt about performing routine oil changes, chances are good that the rockers and/or cam lobes are scored or damaged from poor oiling. The amount of sludge in the head is also a good indicator of poor oil change frequency.

  1. Reassemble the rocker shafts, arms and towers in their exact original order.
  2.  
  3. Remove the head, install a new gasket. See cylinder head removal and installation. Install the rocker assembly and tighten the bolts gradually and in sequence to 58 ft. lbs. (78 Nm).
  4.  
  5. Adjust the valve clearance. Install the valve cover.
  6.  
  7. Test drive the vehicle.
  8.  

3F-E Engine

See Figures 6, 7 and 8

  1. Remove the valve cover.
  2.  



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Fig. Fig. 6: Exploded view of the rocker shaft assembly on the 3F-E engine

  1. The rocker assembly is held by 8 bolts and 4 nuts. These must be loosened evenly in several passes. Do not loosen any one fastener all at once. Loosen the nuts and bolts in the correct order.
  2.  



Click image to see an enlarged view

Fig. Fig. 7: Loosen the rocker assembly bolts in several passes in this order

  1. Inspect the rocker arm-to-shaft wear by wiggling the arm laterally on the shaft. Little or no movement should be felt.
  2.  
  3. If movement is found in the arm-to-shaft wiggle test, disassemble the shaft and keep every piece in exact order. Measure the oil clearance as follows:
    1. Measure the outside diameter of the rocker shaft with a micrometer.
    2.  
    3. Measure the inside diameter of the rocker arms with a dial indicator.
    4.  
    5. The difference between the rocker arm inner diameter and the shaft outer diameter is the oil clearance. Correct clearance is 0.0004-0.0020 inches (0.01-0.05 mm). Maximum allowable clearance is 0.0031 inches (0.08 mm).
    6.  

  4.  
  5. Inspect the face of each rocker; the surface should be smooth, shiny and evenly shaped. Any sign of metal wear or scratching requires replacement of the rocker and a detailed inspection of the camshaft.
  6.  
  7. Remove the cylinder head.
  8.  

The condition of the rocker surfaces and matching camshaft lobes are your report card for oil and filter changes. If you have been less than prompt about performing routine oil changes, chances are good that the rockers and/or cam lobes are scored or damaged from poor oiling. The amount of sludge in the head is also a good indicator of poor oil change frequency.

To install:
  1. Install the cylinder head with a new gasket. Reassemble the rocker shafts, arms and towers in their exact original order.
  2.  
  3. Place the rocker shaft assembly on the cylinder head. Align the adjusting screws with the heads of the pushrods.
  4.  
  5. Install the retaining bolts. Tighten them in the correct order and in several passes to the correct torque. The 12 mm bolt heads should be tightened to 15-17 ft. lbs. (21-24 Nm). The 14 mm bolt head and the nut should be tightened to 25 ft. lbs. (33 Nm).
  6.  



Click image to see an enlarged view

Fig. Fig. 8: Tighten the rocker assembly bolts in several passes following this order

  1. Adjust the valve clearance. Reinstall the valve cover.
  2.  

 
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