Toyota Pick-ups/Land Cruiser/4Runner 1970-1988

Rocker Arms

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See Figures 1 through 12

REMOVAL & INSTALLATION



All Engines Except 3VZ-E
  1. Remove the rocker shaft assemblies.
  2.  
  3. On the single rocker shaft engines (8R-C, 18R-C, F, 2F, 3F-E and diesels), remove the rocker shaft support attaching bolts (#2 in illustration) and the rocker shaft retaining screw (#3 in illustration). Slide the tension springs, rocker arms and rocker supports off of the shafts. Make sure you keep the parts in order as they were removed from the shaft-this is very important.
  4.  
  5. On the double rocker shaft engines (20R, 22R, 22R-E and 22R-TE), remove the rocker shaft assemblies. 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.
  6.  
  7. Assembly is in the opposite order of removal; make sure all components are reassembled in their original positions. Adjust the valves.
  8.  



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Fig. Fig. 1: Single rocker shaft (8R-C, 18R-C) assembly--note the support attaching bolts (#2) and shaft retaining screw (#3)



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Fig. Fig. 2: Double rocker shaft assembly--rocker arms must be assembled in their original position-20R engine 22R similar



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Fig. Fig. 3: 8R-C and 18R-C rocker arm shaft removal sequence--pulling out of the rocker shaft bolts (A) will allow removal of the rocker supports



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Fig. Fig. 4: Rocker arm loosening sequence-20R, 22R, 22R-E and 22R-TE engines



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Fig. Fig. 5: Rocker arm torque sequence-20R, 22R, 22R-E and 22R-TE engines



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Fig. Fig. 6: Rocker arm loosening sequence-1L, 2L and 2L-T engines



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Fig. Fig. 7: Rocker arm torque sequence-1L, 2L and 2L-T engines



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Fig. Fig. 8: Rocker arm loosening sequence-F, 2F and 3F-E engines



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Fig. Fig. 9: Rocker arm torque sequence-F, 2F and 3F-E engines



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Fig. Fig. 10: Exploded view of the rocker assembly-20R, 22R, 22R-E and 22R-TE engines



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Fig. Fig. 11: Exploded view of the rocker assembly-1L, 2L and 2L-T engines



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Fig. Fig. 12: Exploded view of the rocker assembly-2F and 3F-E engines

INSPECTION



See Figures 13, 14 and 15

The oil clearance between the rocker arm and shaft is measured in two steps. Measure the outside diameter of the rocker shaft with a micrometer. Measure the inside diameter of the rocker arms with a dial indicator. The difference between the rocker arm inner diameter and the shaft outer diameter is the oil clearance. Clearance specs are as follows:



8R-C: 0.030-0.38mm
 
18R-C: 0.017-0.051mm
 
20R: 0.010-0.050mm
 
22R, 22R-E, 22R-TE: 0.010-0.050mm
 
F, 2F, 3F-E: 0.010-0.050mm
 
1L, 2L, 2L-T: 0.018-0.056mm
 

If specifications are not within these ranges, replace either the rocker shaft or rocker arm. Clearance can also be checked by moving the rocker arm laterally on the shaft when assembled. There should be little or no movement.

While disassembled, check the cam follower end (the flat end that contacts the camshaft) of the rocker arm for excess wear. The surface should be smooth and shiny. If excess wear is evident, check also the lobe of the camshaft, it may also be worn.

Reassemble the rocker shaft assemblies in the exact opposite order or removal. Accelerated camshaft wear and/or sloppy valve action will result if rocker arms are mixed and end up operating against the wrong cam lobes.



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Fig. Fig. 13: Check the rocker arm-to-shaft wear by wiggling the arm laterally on the shaft--little or no movement should be felt



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Fig. Fig. 14: Measure the inside diameter of the rocker with dial indicator



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Fig. Fig. 15: Measure the outside diameter of the rocker shaft with a micrometer

 
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