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Home >> Subaru >> 2003 >> Outback Base, 4D Sedan >> Repair and Diagnosis >> Engine Performance >> Engine Controls - On-Vehicle Adjustments >> Engine Mechanical >> Valve Clearance Inspection >> 2.5L

Valve Clearance Inspection: 2.5L

  1. Set the vehicle onto the lift.
  2. Lift-up the vehicle.
  3. Remove the under cover. See Figure .
  4. Disconnect the ground terminal from battery. See Figure .
  5. Lower the vehicle.
  6. Remove the timing belt cover. See Fig 1 .
  7. When inspecting No. 1 and No. 3 cylinders; remove the air intake duct as a unit. See Figure . Remove the resonator chamber. See Fig 2 . Disconnect the spark plug cords from the right side spark plugs. Disconnect the PCV hose from the right rocker cover. Remove the bolts, then remove the right rocker cover.
  8. When inspecting No. 2 and No. 4 cylinders; remove the battery and battery carrier. Disconnect the window washer motor connectors. Remove the two bolts which hold washer tank, then secure the tank away from working area. See Figure . Disconnect the spark plug cords from the left side spark plugs. Disconnect the PCV hose from the left rocker cover. Remove the bolts, then remove the left rocker cover.
    9. NOTE: When the arrow mark (A) on left camshaft sprocket comes exactly to the top, No. 1 cylinder piston is brought to top dead center of compression stroke. See Fig 3 .
  9. Set No. 1 cylinder piston to top dead center of compression stroke by rotating the crank shaft pulley clockwise using Crankshaft Pulley Wrench (499977100).
    10. CAUTION: Insert the thickness gauge in as horizontal a direction as possible with respect to the valve stem end face. Measure the exhaust valve clearances while lifting-up the vehicle. See VALVE CLEARANCE SPECIFICATION (2.0L & 2.5L)  table.
  10. Measure No. 1 cylinder valve clearance by using thickness gauge (A). See Fig 4 .
    11. NOTE: Ensure the cylinder pistons are set to their respective top dead centers on compression stroke before measuring valve clearances. To set No. 3, No. 2 and No. 4 cylinder pistons to their top dead centers on compression stroke, turn the crankshaft pulley clockwise 90 degrees at a time starting with arrow mark on left camshaft sprocket facing up. See Fig 5 .
  11. Using procedures similar to what was used for No. 1 cylinder, measurement measure No. 2, No. 3 and No. 4 cylinder valve clearances.
  12. If necessary, adjust the valve clearance. See 2.0L & 2.5L  under VALVE ADJUSTMENT. After inspection, install the related parts in the reverse order of removal.
Fig 1: Removing Right Timing Belt Cover
G00157457Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Removing Resonator Chamber
G00157459Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Identifying Top Dead Center For Cylinder No. 1, Using Left Camshaft Arrow
G00157461Courtesy of SUBARU OF AMERICA, INC.
Fig 4: Measuring No. 1 Valve Clearance
G99J52497Courtesy of SUBARU OF AMERICA, INC.
Fig 5: Identifying Top Dead Center For Cylinders No. 3, 2 & 4, Using Left Camshaft
G00157462Courtesy of SUBARU OF AMERICA, INC.
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