Isuzu Cars and Trucks 1981-1991

Rocker Arm Cover

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REMOVAL AND INSTALLATION
4-Cylinder SOHC Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner (carbureted) and air inlet hose (EFI).
  4.  
  5. Remove the PCV hose.
  6.  
  7. Label and remove the spark plug wires.
  8.  
  9. Remove the timing belt cover attaching bolts, if so equipped.
  10.  
  11. Disconnect the power brake booster hose and throttle cable if in the way.
  12.  
  13. Remove the rocker arm cover bolts and cover.
  14.  
  15. If the cover will not come loose, tap the sides with a rubber hammer to dislodge.
  16.  

To install:

  1. Clean the gasket mating surfaces with a scraper and solvent.
  2.  
  3. Install a new gasket and apply a 0.08 and 190.12 in. (2 and 193mm) bead of RTV sealer around the gasket surface.
  4.  
  5. Install the rocker arm cover and torque the bolts to 89 inch lbs. (10 Nm).
  6.  
  7. Install the spark plug wires, PCV hose, brake booster hose and throttle cable if removed.
  8.  
  9. Install the air cleaner or air inlet hose.
  10.  
  11. Connect the battery cable, start the engine and check for leaks.
  12.  



Click image to see an enlarged view

Fig. Rocker arm cover removal SOHC engines

4-Cylinder DOHC Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the and air inlet hose (EFI).
  4.  
  5. Remove the PCV hose. Remove the center cover.
  6.  
  7. Label and remove the spark plug wires.
  8.  
  9. Remove the upper timing belt cover attaching bolts.
  10.  
  11. Remove the rocker arm cover bolts and cover.
  12.  
  13. If the cover will not come loose, tap the sides with a rubber hammer to dislodge.
  14.  

To install:

  1. Clean the gasket mating surfaces with a scraper and solvent. Be careful not to damage aluminum surfaces.
  2.  
  3. Install a new gasket and apply a 0.08 and 190.12 in. (2 and 193mm) bead of RTV sealer around the gasket surface.
  4.  
  5. Install the rocker arm cover and torque the bolts to 53 inch lbs. (6 Nm).
  6.  
  7. Install the spark plug wires, center cover and PCV hose.
  8.  
  9. Install the air cleaner or air inlet hose.
  10.  
  11. Connect the battery cable, start the engine and check for leaks.
  12.  



Click image to see an enlarged view

Fig. Rocker arm cover removal DOHC engines

V6 Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner.
  4.  
  5. Remove the ignition coil and bracket (RH) or the crankcase ventilation valve (LH).
  6.  
  7. Label and remove the spark plug wires from the bracket at the rocker arm cover stud.
  8.  
  9. Remove the PCV valve (RH).
  10.  
  11. Remove the throttle cable and alternator (RH only).
  12.  
  13. Remove the rocker arm cover nuts, reinforcements, cover and gasket. If the cover sticks to the head, bump the end of the cover with a rubber hammer. Do NOT damage the sealing flange.
  14.  

To install:

  1. Clean the gasket mating surfaces with a scraper and solvent.
  2.  
  3. Install the rocker arm cover with a new gasket. Apply RTV sealer to the cylinder head-to-intake manifold contact points.
  4.  
  5. Install the rocker arm cover nuts and reinforcements. Torque the cover bolts to 72 inch lbs. (8 Nm).
  6.  
  7. Install the throttle cable and alternator (RH only).
  8.  
  9. Install the PCV valve (RH).
  10.  
  11. Install the spark plug wires to the bracket at the rocker arm cover stud.
  12.  
  13. Install the ignition coil and bracket (RH) or the crankcase ventilation valve (LH).
  14.  
  15. Install the air cleaner.
  16.  
  17. Connect the negative (-) battery cable, start the engine and check for leaks.
  18.  



Click image to see an enlarged view

Fig. Rocker arm cover removal V6 engines

 
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