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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical (H4SO)) >> Valve Clearance >> Inspection

Valve Clearance: Inspection

WARNING: This page is about a different variant/trim than selected.
CAUTION: Inspection and adjustment of valve clearance should be performed while engine is cold.
  1. Set the vehicle on a lift.
  2. Lift-up the vehicle.
  3. Remove the under cover.
  4. Lower the vehicle.
  5. Disconnect the ground cable from the battery.
    Fig 1: Connecting Battery Ground Cable To Battery
    G05019586Courtesy of SUBARU OF AMERICA, INC.
  6. Remove the timing belt cover (LH).
    Fig 2: Identifying Timing Belt Cover (LH)
    G04997591Courtesy of SUBARU OF AMERICA, INC.
  7. Remove the fuel injector. < Ref. to REMOVAL , Fuel Injector. >
  8. When inspecting #1 and #3 cylinders:
    1. Disconnect the spark plug cords from spark plugs RH side. < Ref. to RH SIDE , REMOVAL, Spark Plug. >
    2. Disconnect the PCV hose from rocker cover (RH).
    3. Remove the bolts, then remove the rocker cover (RH).
  9. When inspecting #2 and #4 cylinders:
    1. Disconnect the spark plug cords from spark plugs (LH side). < Ref. to LH SIDE , REMOVAL, Spark Plug. >
    2. Disconnect the PCV hose from rocker cover (LH).
    3. Remove the bolts, then remove the rocker cover (LH).
  10. Set #1 cylinder piston to top dead center of compression stroke by rotating the crank pulley clockwise using the socket wrench.
    NOTE: When the arrow mark (A) on cam sprocket (LH) comes exactly to the top, #1 cylinder piston is brought to the top dead center of compression stroke.
    Fig 3: Identifying Arrow Mark On Cam Sprocket
    G04997592Courtesy of SUBARU OF AMERICA, INC.
  11. Measure #1 cylinder valve clearance by using thickness gauge.
    CAUTION:
    • Insert the thickness gauge (A) in as horizontally as possible with respect to the valve stem end face.
    • Measure the exhaust valve clearance while lifting-up the vehicle.

    Valve clearance (standard): 

    Intake 

    0.20±0.04 mm (0.0079±0.0016 in) 

    Exhaust 

    0.25±0.04 mm (0.0098±0.0016 in) 

    Fig 4: Measuring Valve Clearances
    G04997593Courtesy of SUBARU OF AMERICA, INC.
  12. If necessary, adjust the valve clearance. < Ref. to ADJUSTMENT , Valve Clearance. >
  13. Measure the valve clearance in #3, #2 and #4 cylinder in the same measurement procedure as #1 cylinder.
    NOTE:
    • Be sure to set the cylinder pistons to their respective top dead centers on compression stroke before measuring valve clearances.
    • By rotating the crank pulley clockwise every 180° from the state that #1 cylinder piston is on the top dead center of compression stroke, #3, #2 and #4 cylinder pistons come to the top dead center of compression stroke in this order.
  14. After inspection, install the related parts in the reverse order of removal.
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