When Timing Chain Assembly Is Not Removed

CAUTION: When working on the vehicle, if engine oil is spilt onto the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.

NOTE:

Inspection of cam clearance should be performed while engine is cold.
If the engine is removed from vehicle, performing the step 1) and 2) is not necessary.

Disconnect the ground cable from battery.

Fig 1: Connecting/Disconnecting Battery Ground Terminal
Courtesy of SUBARU OF AMERICA, INC.
Remove the air intake duct. Refer to REMOVAL .
When inspecting #1 and #3 cylinders
1. Remove the rocker cover RH. Refer to ROCKER COVER RH .
  NOTE: When working on the vehicle, place a suitable container under the vehicle.
2. Set #1 cylinder piston to top dead center of compression stroke by rotating the crank pulley clockwise using the socket wrench.
  NOTE: When the timing mark (A) on crank pulley is aligned to the 0° in timing gauge (B) on chain cover as shown in the figure, the #1 cylinder piston is located at TDC of compression stroke if the intake camshaft and exhaust camshaft does not depress the #1 cylinder intake side roller rocker arm (intake valve) and exhaust side roller rocker arm (exhaust valve). If roller rocker arm (valve) is depressed, turn the crank pulley by 360° in order to make #1 cylinder piston at TDC of compression stroke.
  
  Fig 2: Identifying Crank Pulley Timing Mark And Chain Cover Timing Gauge
  Courtesy of SUBARU OF AMERICA, INC.
3. Check the cam clearance for #1 cylinder intake, #1 cylinder exhaust and #3 cylinder exhaust.
  NOTE:
  - Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
  - If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.
  Cam clearance:
  
  Intake
  
  Standard
  
  0.13±0.03 mm (0.0051±0.0012 in)
  
  Exhaust
  
  Standard
  
  0.24±0.03 mm (0.0094±0.0012 in)
  
  Fig 3: Checking Cam Clearance For No. 1 Cylinder Intake, No. 1 And No. 3 Cylinder Exhaust
  Courtesy of SUBARU OF AMERICA, INC.
4. Turn the crank pulley by 360°.
  
  Fig 4: Turning Crank Pulley
  Courtesy of SUBARU OF AMERICA, INC.
5. Check the clearance of #3 cylinder intake.
  NOTE:
  - Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
  - If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.
  Cam clearance:
  
  Standard
  
  0.13±0.03 mm (0.0051±0.0012 in)
  
  Fig 5: Checking Clearance Of No. 3 Cylinder Intake
  Courtesy of SUBARU OF AMERICA, INC.
When inspecting #2 and #4 cylinders
1. Remove the rocker cover LH. Refer to ROCKER COVER LH .
  NOTE: When working on the vehicle, place a suitable container under the vehicle.
2. Set #2 cylinder piston to top dead center of compression stroke by rotating the crank pulley clockwise using the socket wrench.
  NOTE: When the timing mark (A) on crank pulley is aligned to the 0° in timing gauge (B) on chain cover as shown in the figure, the #2 cylinder piston is located at TDC of compression stroke if the intake camshaft and exhaust camshaft does not depress the #2 cylinder intake side roller rocker arm (intake valve) and exhaust side roller rocker arm (exhaust valve). If roller rocker arm (valve) is depressed, turn the crank pulley by 360° in order to make #2 cylinder piston at TDC of compression stroke.
  
  Fig 6: Identifying Crank Pulley Timing Mark And Chain Cover Timing Gauge
  Courtesy of SUBARU OF AMERICA, INC.
3. Check the cam clearance for #2 cylinder intake, #2 cylinder exhaust and #4 cylinder exhaust.
  NOTE:
  - Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
  - If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.
  Cam clearance:
  
  Intake
  
  Standard
  
  0.13±0.03 mm (0.0051±0.0012 in)
  
  Exhaust
  
  Standard
  
  0.24±0.03 mm (0.0094±0.0012 in)
  
  Fig 7: Checking Cam Clearance For No. 2 Cylinder Intake, No. 2 And No. 4 Cylinder Exhaust
  Courtesy of SUBARU OF AMERICA, INC.
4. Turn the crank pulley by 360°.
  
  Fig 8: Turning Crank Pulley
  Courtesy of SUBARU OF AMERICA, INC.
5. Check the clearance of #4 cylinder intake.
  NOTE:
  - Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
  - If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.
  Cam clearance:
  
  Standard
  
  0.13±0.03 mm (0.0051±0.0012 in)
  
  Fig 9: Checking Clearance Of No. 4 Cylinder Intake
  Courtesy of SUBARU OF AMERICA, INC.
If necessary, adjust the cam clearance. Refer to ADJUSTMENT .
After inspection, install the related parts in the reverse order of removal.