Valve Clearance: Inspection

WARNING: This page is about a different variant/trim than selected.

Disconnect the ground cable from battery.
Remove the engine from vehicle. <Ref. to REMOVAL , Engine Assembly.>
Remove the timing belt cover RH. <Ref. to REMOVAL , Timing Belt Cover.>
When inspecting #1 and #3 cylinders
1. Disconnect the connector (A) from the exhaust camshaft position sensor RH and the connector (B) form the exhaust oil flow control solenoid valve RH.
  
  Fig 1: Identifying Exhaust Camshaft Position Sensor And Oil Flow Control Solenoid Valve RH Connectors
  Courtesy of SUBARU OF AMERICA, INC.
2. Remove the clip (A) which hold the engine harness to the rocker cover RH.
  
  Fig 2: Identifying Exhaust Camshaft Position Sensor And Oil Flow Control Solenoid Valve LH Connectors
  Courtesy of SUBARU OF AMERICA, INC.
3. Remove the ignition coil. <Ref. to REMOVAL , Ignition Coil.>
4. Disconnect PCV hose (A) and vacuum hose (B) from the rocker cover RH.
  NOTE: Pinch the clamp by fitting the cut out in the ST with the protrusion on the clamp as shown in the figure, and unlock the clamp.
  
  ST 18353AA000 CLAMP PLIERS
  
  Fig 3: Fitting Clamp Pliers (18353AA000) Cut Out To Clamp Protrusion
  Courtesy of SUBARU OF AMERICA, INC.
  
  Fig 4: Identifying PCV And Vacuum Hoses
  Courtesy of SUBARU OF AMERICA, INC.
5. Remove the rocker cover RH.
When inspecting #2 and #4 cylinders
1. Remove the secondary air pump. <Ref. to REMOVAL , Secondary Air Pump.>
2. Disconnect the connector (A) from the exhaust camshaft position sensor LH and the connector (B) form the exhaust oil flow control solenoid valve LH.
  
  Fig 5: Identifying Exhaust Camshaft Position Sensor And Oil Flow Control Solenoid Valve LH Connectors
  Courtesy of SUBARU OF AMERICA, INC.
3. Remove the air duct B (B) from the rocker cover LH and the air duct A (A).
  
  Fig 6: Identifying Rocker Cover LH Air Ducts
  Courtesy of SUBARU OF AMERICA, INC.
4. Remove the ignition coil. <Ref. to REMOVAL , Ignition Coil.>
5. Disconnect PCV hose (A) and vacuum hose (B) from the rocker cover LH.
  NOTE: Pinch the clamp by fitting the cut out in the ST with the protrusion on the clamp as shown in the figure, and unlock the clamp.
  
  ST 18353AA000 CLAMP PLIERS
  
  Fig 7: Fitting Clamp Pliers (18353AA000) Cut Out To Clamp Protrusion
  Courtesy of SUBARU OF AMERICA, INC.
  
  Fig 8: Identifying PCV And Vacuum Hoses
  Courtesy of SUBARU OF AMERICA, INC.
6. Remove the rocker cover LH.
Turn the crank pulley clockwise until the round mark on the camshaft sprocket is set to position shown in the figure.
NOTE: Turn the crank pulley using a socket wrench.
- Measurement of clearance of #1 cylinder intake valve and #3 cylinder exhaust valve
  
  Fig 9: Measuring Cylinder Intake And Exhaust Valves Clearances (No 1 And 3)
  Courtesy of SUBARU OF AMERICA, INC.
- Measurement of clearance of #2 cylinder exhaust valve and #3 cylinder intake valve
  
  Fig 10: Measuring Cylinder Intake And Exhaust Valves Clearances (No 2 And 3)
  Courtesy of SUBARU OF AMERICA, INC.
- Measurement of clearance of #2 cylinder intake valve and #4 cylinder exhaust valve
  
  Fig 11: Measuring Cylinder Intake And Exhaust Valves Clearances (No 2 And 4)
  Courtesy of SUBARU OF AMERICA, INC.
- Measurement of clearance of #1 cylinder exhaust valve and #4 cylinder intake valve
Fig 12: Measuring Cylinder Intake And Exhaust Valves Clearances (No 1 And 4)
Courtesy of SUBARU OF AMERICA, INC.
Measure the clearance of intake valve and exhaust valve using thickness gauge (A).
NOTE:
- Insert a thickness gauge in a direction as horizontal as possible with respect to the valve lifter.
- Lift up the vehicle, and then measure the exhaust valve clearances.
- If the measured value is not within the inspection value, take notes of the value in order to adjust the valve clearance later on.
Valve clearance (inspection value):

Intake

0.20 ^+0.04 _-0.06 mm (0.0079 ^+0.0016 _-0.0024 in)

Exhaust

0.35±0.05 mm (0.0138±0.0020 in)

Fig 13: Measuring Intake And Exhaust Valve Clearance Using Thickness Gauge
Courtesy of SUBARU OF AMERICA, INC.
If necessary, adjust the valve clearance. <Ref. to ADJUSTMENT , Valve Clearance.>
After inspection, install the related parts in the reverse order of removal.
NOTE:
- Refer to "Camshaft" when installing the rocker cover. <Ref. to INSTALLATION , Camshaft.>
- Use a new clamp, fit the cut out in the ST with the protrusion on the clamp as shown in the figure, and lock the clamp.
ST 18353AA000 CLAMP PLIERS

Fig 14: Fitting Clamp Pliers (18353AA000) Cut Out To Clamp Protrusion
Courtesy of SUBARU OF AMERICA, INC.

Fig 15: Identifying PCV And Vacuum Hoses
Courtesy of SUBARU OF AMERICA, INC.

Tightening torque:

6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

Fig 16: Identifying PCV And Vacuum Hoses
Courtesy of SUBARU OF AMERICA, INC.