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 steps 1) to 2) is not necessary.

Remove the collector cover.
1. Remove the clip (A).
2. Hold the shaded area (B) by hand and carefully pull the RH side (C) upward.
3. Hold the shaded area (D) by hand and carefully pull the LH side (E) upward.
Fig 1: Removing Collector Cover
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the ground cable from battery. Ref. to NOTE>NOTE>BATTERY .
Remove the V-belts. Ref. to MECHANICAL (H4DOTC)>V-belt>REMOVAL .
When inspecting #1 and #3 cylinders
1. Remove the rocker cover RH. Ref. to MECHANICAL (H4DOTC)>Rocker Cover>REMOVAL>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 (B) on crank pulley is aligned to the 0° in timing gauge (A) 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: Aligning Timing Mark On Crank Pulley To Timing Gauge On Chain Cover
  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^+0.02_{-0.03 mm} (0.0051^+0.0008_-0.0012 in)
  
  Exhaust
  
  Standard
  
  0.22±0.02 mm (0.0087±0.0008 in)
  
  Fig 3: Measuring Roller Surface Of Cam Base Circle And Roller Rocker Arm Using Thickness Gauge
  Courtesy of SUBARU OF AMERICA, INC.
4. Turn the crank pulley by 360°.
  
  Fig 4: Turning Crank Pulley By 360°
  Courtesy of SUBARU OF AMERICA, INC.
5. Check the cam 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 ^+0.02 _-0.03 mm (0.0051 ^+0.0008 _-0.0012 in)

Fig 5: Measuring Roller Surface Of Cam Base Circle And Roller Rocker Arm Using Thickness Gauge
Courtesy of SUBARU OF AMERICA, INC.
When inspecting #2 and #4 cylinders
1. Remove the rocker cover LH. Ref. to MECHANICAL (H4DOTC)>Rocker Cover>REMOVAL>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 (B) on crank pulley is aligned to the 0° in timing gauge (A) 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: Aligning Timing Mark On Crank Pulley To Timing Gauge On Chain Cover
  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+0.02_-0.03 mm (0.0051^+0.0008_-0.0012 in)
  
  Exhaust
  
  Standard
  
  0.22±0.02 mm (0.0087±0.0008 in)
  
  Fig 7: Measuring Roller Surface Of Cam Base Circle And Roller Rocker Arm Using Thickness Gauge
  Courtesy of SUBARU OF AMERICA, INC.
4. Turn the crank pulley by 360°.
  
  Fig 8: Turning Crank Pulley By 360°
  Courtesy of SUBARU OF AMERICA, INC.
5. Check the cam 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^+0.02_-0.03 mm (0.0051^+0.0008_-0.0012 in)

Fig 9: Measuring Roller Surface Of Cam Base Circle And Roller Rocker Arm Using Thickness Gauge
Courtesy of SUBARU OF AMERICA, INC.
If necessary, adjust the cam clearance. Ref. to MECHANICAL (H4DOTC)>Cam Clearance>ADJUSTMENT .
After inspection, install the related parts in the reverse order of removal.