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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Mechanical (H4DOTC)) >> Cylinder Head >> Inspection >> Valve Guide

Valve Guide

WARNING: This page is about a different variant/trim than selected.
  1. Check the clearance between valve guide and stem. The clearance can be checked by measuring the outer diameter of valve stem and inner diameter of valve guide respectively with a micrometer.

    Clearance between the valve guide and valve stem: 

    Standard Intake 

    0.030 - 0.057 mm (0.0012 - 0.0022 in) 

    Exhaust 

    0.040 - 0.067 mm (0.0016 - 0.0026 in) 

  2. If the clearance between valve guide and stem exceeds the standard value, replace the valve guide or valve itself whichever shows greater amount of wear or has abnormality such as scratch. See the following procedure for valve guide replacement.

    Valve guide inner diameter: 

    6.000 - 6.012 mm (0.2362 - 0.2367 in) 

    Valve stem outer diameters: 

    Intake 

    5.955 - 5.970 mm (0.2344 - 0.2350 in) 

    Exhaust 

    5.945 - 5.960 mm (0.2341 - 0.2346 in) 

  1. Place the cylinder head on ST1 with the combustion chamber upward so that valve guides fit the holes in ST1.
  2. Insert the ST2 into valve guide and press it down to remove the valve guide.

    ST1 498267600 CYLINDER HEAD TABLE

    ST2 499767200 VALVE GUIDE REMOVER

    Fig 1: Removing Valve Guide Using Special Tools
    G03829665Courtesy of SUBARU OF AMERICA, INC.
  3. Turn the cylinder head upside down and place the ST as shown in Fig 2 .

    ST 18251AA020 VALVE GUIDE ADJUSTER

    Fig 2: Identifying Valve Guide Adjuster ST 18251Aa020
    G03829666Courtesy of SUBARU OF AMERICA, INC.
  4. Before installing a new valve guide, make sure that neither scratches nor damages exist on the inside surface of the valve guide holes in cylinder head.
  5. Put a new valve guide, coated with sufficient oil, in cylinder, and insert the ST1 into valve guide. Press-in until the valve guide upper end is flush with the upper surface of ST2.

    ST1 499767200 VALVE GUIDE REMOVER

    ST2 18251AA020 VALVE GUIDE ADJUSTER

    Fig 3: Identifying Valve Guide Remover ST1 499767200 And Valve Guide Adjuster ST2 18251Aa020
    G03829667Courtesy of SUBARU OF AMERICA, INC.
  6. Check the valve guide protrusion.

    Valve guide protrusion L: 

    15.8 - 16.2 mm (0.622 - 0.638 in) 

  7. Ream the inside of valve guide using ST. Put the reamer in valve guide, and rotate the reamer slowly clockwise pushing it lightly. Bring the reamer back while rotating it clockwise. After reaming, clean the valve guide to remove chips.

    ST 499767400 VALVE GUIDE REAMER

    NOTE:
    • Apply engine oil to the reamer when reaming.
    • If the inner surface of the valve guide is torn, the edge of the reamer should be slightly ground with an oil stone.
    • If the inner surface of the valve guide becomes lustrous and the reamer does not chip, use a new reamer or remedy the reamer.
  8. Recheck the contact condition between valve and valve seat after replacing the valve guide.
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