REMOVAL & INSTALLATION

Air Pump

1. Remove the air cleaner assembly from the carburetor.
2. Loosen, but do not remove, the adjusting link bolt.
3. Push the pump toward the engine to slacken belt tension and remove drive belt.
4. Disconnect the air supply hoses from the pump.
5. Unfasten the pump securing bolts and remove the pump.

   WARNING
   Do not pry on the air pump housing during removal and do not clamp the housing in a vise once the pump has been removed. Any type of heavy pressure applied to the housing will distort it.

6. Installation is performed in the reverse order of removal. Adjust the belt tension by moving the air pump to the specification given in the Testing section, above.

Air Control Valve

CAUTION
Remove the air control valve only after the thermal reactor has cooled sufficiently to prevent the danger of a serious burn.

1. Remove the air cleaner assembly.
2. Unfasten the leads from the air control valve solenoid.
3. Disconnect the air hoses from the valve.
4. Loosen the screws which secure the air control valve and remove the valve.
5. Valve installation is performed in the reverse order of removal.

Check Valve

1. Perform the air control valve removal procedure, detailed above. Be sure to pay attention to the CAUTION.
2. Remove the check valve seat.
3. Withdraw the valve plate and spring.
4. Install the check valve in the reverse order of removal.

Air Injection Nozzle

1. Remove the gravel shield from underneath the truck.
2. Perform the oil pan removal procedure as detailed in ``Engine Lubrication,'' above.
3. Unbolt the air injection nozzles from both of the rotor housings.
4. Nozzle installation is performed in the reverse order of removal.