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

Rocker Arm (Valve) Cover

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REMOVAL & INSTALLATION



Check the hoses, wiring, bolt threads and any other part that could be damaged or worn replace if needed.

Apply a lubricant onto any nuts or bolts that will be removed. Allow the lubricant to sit for a short while. This will aid in the removal of tight and frozen nuts and bolts.

22R, 22R-E and 3F-E Engines

See Figures 1, 2, 3, 4, 5 and 6

  1. Disconnect the negative battery cable.
  2.  
  3. On 22R and 22R-E engines, remove the ground strap from the valve cover.
  4.  



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Fig. Fig. 1: Remove the bolt securing the ground strap to the valve cover

  1. On 3F-E, remove the air cleaner hose.
  2.  
  3. Disconnect the PCV hose(s) from the cam cover.
  4.  
  5. Remove the nuts and washers. Lift the cover off the cylinder head. Cover the oil return hole in the head to prevent dirt or objects from falling in. Remove the gasket.
  6.  



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Fig. Fig. 2: It may be necessary to use a deep socket to remove the retaining nuts



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Fig. Fig. 3: Be careful not to lose the seal washers

To install:


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Fig. Fig. 4: Once the retaining nuts are removed, lift the cover from the head...

  1. Replace the rubber half moon seals in the cylinder head if they seem to be deteriorated.
  2.  



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Fig. Fig. 5: ... then pull the rubber gasket off the head mating area



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Fig. Fig. 6: Inspect the half moon seals, replace if deteriorated

  1. Replace the cover gasket if it shows any signs of damage, breaks or cracking. Install new nut gaskets, then tighten the nuts evenly to 43-48 inch lbs (4-5 Nm) for four cylinder engines and 78 inch lbs. (9 Nm) for six cylinder engines. Do not overtighten.
  2.  
  3. Reconnect the PCV hose and install the air cleaner hose or ground strap.
  4.  

3VZ-E Engine

See Figures 7, 8, 9, 10 and 11

  1. Disconnect the throttle position sensor.
  2.  
  3. Unsecure the canister vacuum hose from the throttle body.
  4.  
  5. Take off the vacuum and fuel hoses from the pressure regulator.
  6.  
  7. Disconnect PCV hose from the hose union.
  8.  
  9. Remove the water bypass hose from the union at the intake manifold.
  10.  
  11. Disconnect the cold start injector connector.
  12.  



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Fig. Fig. 7: Disconnect the hose from cold start injector pipe

  1. Take off the vacuum hose from the fuel filter.
  2.  
  3. Remove the union bolt and the two gaskets and the cold start injector tube.
  4.  
  5. On California vehicles, disconnect the EGR temperature sensor connector.
  6.  
  7. Disconnect the EGR vacuum hoses from the air pipe and EGR vacuum modulator.
  8.  



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Fig. Fig. 8: Remove the bolts securing the EGR assembly to the engine

  1. Remove the nut, bolt and intake manifold stay (support).
  2.  
  3. Disconnect the 2 water bypass hoses from the EGR valve.
  4.  
  5. Remove the 5 nuts and remove the EGR valve with the pipes and 2 gaskets.
  6.  
  7. Remove the 6 bolts and 2 nuts holding the intake manifold; remove the gasket.
  8.  
  9. Disconnect and label the following wires:
  10.  



Knock sensor connector
 
Water temperature switch connector
 
Start injection timer
 
Water temperature sensor connector
 
Water temperature sender gauge connector
 
Right side engine ground strap
 
Injector connector
 



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Fig. Fig. 9: Remove the two bolts retaining the engine harness in place

  1. Remove the two bolts holding the engine wire harness and remove the harness.
  2.  
  3. Remove the bolts holding the valve cover(s); remove the cover(s) and gaskets.
  4.  

To install:
  1. Examine the gasket closely for any sign of cracking or deformation. Replace the gasket if necessary.
  2.  
  3. Place the gasket on the cover. Apply sealant at the 4 corners of each head as shown in the illustration. Do not apply sealant to the entire gasket.
  4.  



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Fig. Fig. 10: Sealant must be applied to the four corners of each head as shown

  1. Place the valve cover and gaskets in place on the head and install the small retaining bolts. Tighten them evenly only to 5-6 ft. lbs. (7-8 Nm), do not overtighten.
  2.  
  3. Install the engine wire harness with its two bolts. Engage all the connectors disconnected in Step 17.
  4.  
  5. Position a new gasket on the intake manifold. Install the manifold, tightening the six bolts and two nuts to 13 ft. lbs. (18 Nm).
  6.  
  7. Connect the No.1 air hose to the reed valve.
  8.  
  9. Install two new gaskets to the intake manifold and right side exhaust manifold. Install the EGR valve and pipes.
  10.  
  11. Install the two water bypass hoses to the EGR if so equipped.
  12.  
  13. Install the intake manifold support; tighten the groups of bolts to the proper torque-refer to the diagram for designations. Group (A) bolts should be tightened to 9 ft. lbs. (12 Nm), group (B) to 13 ft. lbs. (18 Nm) and group (C) bolts to 22 ft. lbs. (29 Nm).
  14.  



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Fig. Fig. 11: Bolt group designations

  1. Connect the EGR hoses to the air pipe and the EGR vacuum modulator. For California vehicles, connect the EGR temperature sensor connector.
  2.  
  3. Use a new gasket and connect the cold start injector tube. Tighten the union bolt to 13 ft. lbs. (18 Nm).
  4.  
  5. Connect the vacuum hose to the fuel filter, then connect the cold start injector connector.
  6.  
  7. Install the 2 water bypass hoses, one to the bypass pipe and the other to the hose union.
  8.  
  9. Connect the PCV hose to the hose union.
  10.  
  11. Connect the vacuum and fuel hoses to the pressure regulator.
  12.  
  13. Connect the canister vacuum hose to the throttle body.
  14.  
  15. Connect the throttle position sensor wire.
  16.  

2RZ-FE and 3RZ-FE Engines

See Figure 12

  1. Drain the coolant from the engine.
  2.  
  3. On manual transmissions, disconnect the accelerator cable from the throttle body.
  4.  
  5. On automatics, disconnect the accelerator and throttle cables from the throttle body.
  6.  
  7. On cruise control, remove the actuator cover, then disconnect the cruise control cable from the actuator.
  8.  
  9. Disconnect the 3 wire clamps for the engine harness.
  10.  
  11. Unsecure the Mass Air Flow (MAF) meter and Intake Air Temperature (IAT) sensor connections.
  12.  
  13. On the 3RZ-FE engine, disconnect the air hose from the air cleaner cap, then loosen the air cleaner hose clamp.
  14.  
  15. Loosen the 4 clips, and remove the the cleaner cap, Mass Air Flow (MAF) meter and resonator sensor.
  16.  
  17. Remove the air intake sensor by disconnecting the air hose for the Idle Air Control (IAC).
    1. Remove the vacuum sensing hose and wire clamp for the engine wire.
    2.  
    3. Loosen the hose clamp, and remove the bolts retaining the air intake connector.
    4.  

  18.  
  19. Remove the PCV hoses.
  20.  
  21. Tag and disconnect the spark plug wires.
  22.  
  23. Disconnect these wires:
  24.  



A/C connector if equipped
 
Oil pressure sensor wire
 
Engine coolant temperature sensor
 
Distributor wire
 
4 engine wire clamps and engine wire
 

  1. Remove the valve cover bolts, seal washers, cover and gasket.
  2.  



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Fig. Fig. 12: On 2RZ-FE and 3RZ-FE engines, the valve cover is secured by 10 bolts

To install:
  1. Clean the mating areas well.
  2.  
  3. Install the gasket on the cover, then install the cover to the cylinder head. Be sure to have new seal washers, then install the bolts and tighten to the correct specification.
  4.  
  5. Attach the wire removed previously.
  6.  
  7. Install the spark plug wires.
  8.  
  9. Reattach the PCV hoses.
  10.  
  11. Install the air intake chamber.
  12.  
  13. Fill the with a coolant and water mixture.
  14.  
  15. Start the engine and check for leaks. Top off any fluid levels.
  16.  

5VZ-FE Engine

See Figure 13

  1. Disconnect the accelerator and throttle cables from the throttle linkage.
  2.  
  3. Remove the air cleaner cover, air flow meter, and air duct assembly. It will be necessary to disconnect the wiring to the meter and unbolt the assembly, prior to removal.
  4.  
  5. Loosen and remove the valve cover bolts.
  6.  
  7. Remove the valve covers, work on one at a time to avoid confusion.
  8.  



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Fig. Fig. 13: The valve covers are secured to the heads by the bolts shown on 5VZ-FE engines

To install:
  1. Clean the mating areas on the cover and cylinder head.
  2.  
  3. Install the gasket to the head and seal washers. Attach the cover with the mounting bolts. Tighten until snug.
  4.  
  5. Install the air flow meter, air duct, and the air cleaner cover.
  6.  
  7. Connect the accelerator and throttle cables to the throttle linkage.
  8.  

1FZ-FE Engine

See Figures 14 and 15

  1. Drain the cooling system.
  2.  
  3. Remove the throttle body.
  4.  
  5. Disconnect the engine wiring harness and heater control valve from the cowl panel. A ground strap holds the harness in place.
  6.  



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Fig. Fig. 14: Remove the bolts securing the harness ground strap and heater valve to the cowl panel

  1. Tag and disconnect the spark plug wires.
  2.  
  3. Remove the cylinder head (valve) cover bolts, gasket and cover.
  4.  

To install:
  1. Clean the valve cover and mating areas on the engine.
  2.  
  3. Install a new gasket into the groove of the cover.
  4.  
  5. Install and tighten the 13 bolts on the valve cover to the correct specifications.
  6.  



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Fig. Fig. 15: The valve cover on 1FZ-FE engines is secured by 13 bolts

  1. Attach the spark plug wires to there proper locations.
  2.  
  3. Bolt the engine harness to the cowl. Attach the heater control valve.
  4.  
  5. Install the throttle body with a new gasket.
  6.  
  7. Fill the cooling system.
  8.  
  9. Start the engine and check for leaks. Top off any fluid levels.
  10.  

 
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