LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2018 >> Civic EX-L, 4D Hatchback >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control / Engine Mechanical - Service, Testing & Troubleshooting >> Replacement >> Valve Guide Replacement (K20C2) >> Replacement
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Valve Guide Replacement (K20C2): Replacement

  1. Valve Seal and Valve Spring Seat - Remove
  2. Valve Stem-to-Guide Clearance - Inspect 
  3. Valve Guide - Remove
    GHH406727Courtesy of HONDA, U.S.A., INC.
    		 1. As illustrated, use a commercially available air-impact valve guide driver (A) modified to fit the diameter of the valve guides. In most cases, the same procedure can be done using the valve guide driver, 5.35 x 9.7 mm and a conventional hammer.

    2. Select the proper replacement guides, and chill them in the freezer section of a refrigerator for at least an hour.
    GHH406728Courtesy of HONDA, U.S.A., INC.
    		 3. Use a hot plate or oven to evenly heat the cylinder head to 300 deg.F (150 deg.C). Monitor the temperature with a cooking thermometer. Do not get the head hotter than 300 deg.F (150 deg.C); excessive heat may loosen the valve seats.
    GHH406729GHH406730Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    GHH406729GHH406730Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    		 4. Working from the camshaft side, use the driver and an air hammer to drive the guide about 2 mm (0.08 in) towards the combustion chamber. This will knock off some of the carbon and make removal easier. Hold the air hammer directly in line with the valve guide to prevent damaging the driver. Wear safety goggles or a face shield.

    5. Turn the head over, and drive the guide out toward the camshaft side of the head.

    6. If a valve guide will not move, drill it out with an 8 mm (0.31 in) drill bit, then try again.

    NOTE:  Drill guides only in extreme cases; you could damage the cylinder head if the guide breaks.
  4. Valve Guide - Install

    1. Take out the new valve guide (s) from the freezer, one at a time, as you need them.

    GHH406731Courtesy of HONDA, U.S.A., INC.

    2. Apply a thin coat of new engine oil to the outside of the new valve guide.

    3. Install the guide from the camshaft side of the head; use the valve guide driver to drive the guide into the specified installed height (A) of the guide (B). If you have all eight guides to do, you may have to reheat the head.

    Valve Guide Installed Height 
    Intake:  21.2-22.2 mm (0.835-0.874 in) 
    Exhaust:  19.6-20.6 mm (0.772-0.811 in) 
    GHH406732Courtesy of HONDA, U.S.A., INC.
    		 4. Coat both the valve guide reamer, 5.5 mm and the valve guide with cutting oil.

    5. Rotate the valve guide reamer clockwise the full length of the valve guide bore.

    6. Continue to rotate the reamer clockwise while drawing it from the bore.

    7. Thoroughly wash the guide in detergent and water to remove any cutting residue.
  5. Valve Stem-to-Guide Clearance - Inspect 
  6. Valve Seat - Inspect
  7. Valve Seal and Valve Spring Seat - Install
scientia non olet · About LEMON Manuals