Valve Cover - RH Removal/Installation - 4.0L

Drain the cooling system. See ENGINE COOLANT REPLACEMENT - 4.0L .
Remove the air cleaner outlet pipe.
- Disconnect the tube.
- Detach the mass airflow (MAF) sensor wiring pushpin.
- Loosen the clamps and remove the pipe.
  
  Fig 1: Removing Air Cleaner Outlet Pipe
  Courtesy of MAZDA MOTORS CORP.
Release the hose clamps and remove the upper radiator hose.

Fig 2: Removing Hose Clamps And Upper Radiator Hose
Courtesy of MAZDA MOTORS CORP.
Remove the crankcase breather hose and disconnect the vacuum hose.

Fig 3: Removing Crankcase Breather Hose And Vacuum Hose
Courtesy of MAZDA MOTORS CORP.
If equipped with automatic transmission, remove the nut and position the transmission fluid level indicator and tube assembly aside.

Fig 4: Removing Nut - With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Release the hose clamps and disconnect the hoses.

Fig 5: Releasing Hose Clamps
Courtesy of MAZDA MOTORS CORP.
Release the hose clamps and disconnect the hoses.

Fig 6: Releasing Hose Clamps And Disconnect Hoses
Courtesy of MAZDA MOTORS CORP.
Remove the coolant tube bracket bolts.

Fig 7: Removing Coolant Tube Bracket Bolts - With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Release the hose clamp and disconnect the hose. Position the hose aside.

Fig 8: Releasing Hose Clamp
Courtesy of MAZDA MOTORS CORP.
Detach the wiring harness retainer and remove the coolant tube and bracket assembly.

Fig 9: Detaching Wiring Harness Retainer
Courtesy of MAZDA MOTORS CORP.
Disconnect the heater hose and position aside.

Fig 10: Disconnecting Heater Hose
Courtesy of MAZDA MOTORS CORP.
Disconnect the MAF sensor electrical connector and wiring pin-type retainer. Position the wiring aside.

Fig 11: Disconnecting MAF Sensor Electrical Connector And Wiring Pin-Type Retainer
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- It is important to twist the spark plug wire boots while pulling upward to avoid possible damage to the spark plug wire.
NOTE:
- Spark plug wires must be connected to the correct ignition coil terminal. Mark the spark plug wire locations before removing them.
Position the spark plug wires aside.
1. Disconnect the spark plug wires.
2. Disconnect the spark plug wire retainer and position the wires aside.
  
  Fig 12: Disconnecting Spark Plug Wires & Retainer
  Courtesy of MAZDA MOTORS CORP.
Remove the wiring harness retainer.

Fig 13: Removing Wiring Harness Retainer
Courtesy of MAZDA MOTORS CORP.
Disconnect the fuel injector connectors. Position wiring aside.

Fig 14: Disconnecting Fuel Injector Connectors
Courtesy of MAZDA MOTORS CORP.
Remove the bolts and the valve cover.

Fig 15: Removing Bolts And Valve Cover - With Torque Specification
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- Do not use metal scrapers, wire brushes, power abrasive discs or other abrasive means to clean sealing surfaces. These tools cause scratches and gouges which make leak paths.
Clean and inspect the sealing surfaces. Install a new gasket if necessary.
To install, reverse the removal procedure.