Toyota Corolla 1970-1987 Repair Guide

Rocker Arms

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REMOVAL & INSTALLATION



See Figures 1 through 5

The diesel engine (1C-L) uses no rocker arms as the valves are operated directly by the camshaft

Most vehicles covered by this manual are equipped with rocker arms which are mounted on shaft assemblies. In order to remove or replace a rocker arm, the entire shaft assembly must be unbolted from the top of the cylinder head and disassembled. Be sure to use the proper bolt removal/torque sequence when removing or installing the rocker arm shaft retainers.



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Fig. Fig. 1: Loosen and remove the rocker arm shaft retainers using the proper sequence



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Fig. Fig. 2: On A-series engines, DON'T forget the bolts mounted on the shaft lower flanges



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Fig. Fig. 3: Once the retainers are removed, carefully lift the shaft assembly from the engine



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Fig. Fig. 4: If disassembly is necessary, be sure to tag or arrange ALL components to assure installation in the proper locations



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Fig. Fig. 5: Inspect the rocker arms, shafts and other components for wear or damage

A-Series and K-Series Engines

See Figures 6 through 13

  1. Remove the cylinder head cover. For details, please refer to the procedure located earlier in this section.
  2.  
  3. Loosen the valve rocker arm shaft bolts little-by-little, using 3 steps of the proper sequence (moving from the outer to the inner bolts). Carefully lift the rocker arm assembly from the engine.
  4.  



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Fig. Fig. 6: Rocker arm shaft retainer loosening sequence for A-series engines-NOTE that there are usually Two bolts at locations "1'', "5'' and "2''.



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Fig. Fig. 7: Rocker arm shaft bolt loosening sequence-K-series engines

  1. Inspect the valve contacting surface of each rocker arm for wear. Inspect the rocker arm. If movement is felt, disassemble and inspect.
  2.  
  3. Disassemble the rocker shaft assembly by carefully pulling the components from the shaft. Note how each component is oriented on the shaft. Also, BE SURE to tag or arrange all components to assure installation in their original locations.
  4.  
  5. If the valve contacting surface of the rocker arm is worn, resurface it with a valve refacer or an oil stone.
  6.  
  7. Measure the oil clearance between the rocker arms and the shaft. It should be no more than 0.0024 in. (0.061mm), if the clearance is greater, replace the rocker arms.
  8.  

To install:
  1. When assembling the rocker shaft components on the 4A-C engine, face the oil holes in the rocker shaft to the right, left and bottom.
  2.  



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Fig. Fig. 8: Once the shaft is removed, inspect the valve contacting surface of each rocker arm



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Fig. Fig. 9: Check the rocker arm-to-shaft clearance by attempting to rock the arms while they are installed on the shaft

  1. After assembly, install the rocker arm and shaft assembly using the retaining bolts. Tighten the retaining bolts gradually, using 3 passes in the reverse order of removal.
  2.  

Tighten the rocker support bolts to 14-17 ft. lbs. (19-23 Nm)

  1. Check the valve clearances. If clearance should be checked hot, temporarily install the camshaft cover so the engine may be warmed.
  2.  

On most vehicles, unless the rocker arms were replaced or the adjustment screws were turned, adjustment should not be necessary. BUT, it is always wiser to check adjustment now, then to damage the valve train later

  1. Once the valve clearance has be checked and/or adjusted, install the camshaft cover to the engine.
  2.  



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Fig. Fig. 10: Resurfacing the rocker arm contact face



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Fig. Fig. 11: Checking oil clearance



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Fig. Fig. 12: Oil hole positioning-A-series engines



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Fig. Fig. 13: Exploded view of a common rocker arm shaft assembly-K-series shown

T-Series Engines

See Figures 8 through 14

  1. Remove the cylinder head cover. For details, please refer to the procedure located earlier in this section.
  2.  
  3. Loosen the valve rocker arm shaft bolts little-by-little, using 3 steps of the proper sequence (moving from the outer to the inner bolts). Carefully lift the rocker arm assembly from the engine.
  4.  
  5. Inspect the valve contacting surface of each rocker arm for wear. Inspect the rocker arm. If movement is felt, disassemble and inspect.
  6.  



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Fig. Fig. 14: Rocker arm shaft bolts loosening sequence-T-series engines

  1. To disassemble the rocker shaft assembly, remove the retaining clips from the ends of each shaft, then carefully slide the supports, springs and rocker arms off of each shaft.
  2.  
  3. If the valve contacting surface of the rocker arm is worn, resurface it with a valve refacer or an oil stone.
  4.  
  5. Measure the oil clearance between the rocker arms and the shaft. It should be no more than 0.0024 in. (0.061mm), if the clearance is greater, replace the rocker arms.
  6.  

To install:
  1. When assembling the rocker arms and shafts:
    1. Face the holes in the intake and exhaust shafts toward the front.
    2.  
    3. There are three (3) types of rocker supports, install them on the shafts in the order noted during removal.
    4.  
    5. Face the side of the rocker support with an F toward the front.
    6.  
    7. The short rocker arms are for the intake (right) side and the long ones are for the exhaust (left) side.
    8.  
    9. Align the hole in the rocker support with the groove in the rocker shaft, then install the bolt to keep the shaft from turning.
    10.  

  2.  
  3. After assembly, install the rocker arm and shaft assembly using the retaining bolts. Tighten the retaining bolts gradually, using 3 passes in the reverse order of removal.
  4.  

As the rocker support bolts are also the cylinder head bolts, make sure that they are properly torqued to specification

  1. Check the valve clearances. If clearance is to be checked hot, temporarily install the camshaft cover so the engine may be warmed.
  2.  

On most vehicles, unless the rocker arms were replaced or the adjustment screws were turned, adjustment should not be necessary. BUT, it is always wiser to check adjustment now, then to damage the valve train later

  1. Once the valve clearance has be checked and/or adjusted, install the camshaft cover to the engine.
  2.  

 
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