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Home >> Honda >> 2021 >> Pilot EX, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System / Engine Mechanical - Service, Testing & Troubleshooting >> Replacement >> Valve Guide >> Replacement
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Valve Guide: Replacement

  1. Valve Seal and Valve Spring Seat - Remove
  2. Valve Guide - Remove
    GHH308275Courtesy 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 valve guides, and chill them in the freezer section of a refrigerator for at least an hour.
    GHH308276Courtesy of HONDA, U.S.A., INC.
    		 3. Use a hot plate or an oven to evenly heat the cylinder head to 300 °F (150 °C). Monitor the temperature with a cooking thermometer. Do not get the cylinder head hotter than 300 °F (150 °C); excessive heat may loosen the valve seats.
    GHH308277GHH308278Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    GHH308277GHH308278Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    		 4. Working from the camshaft side, use the valve guide driver and an air hammer to drive the valve 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 cylinder head over, and drive the valve guide out toward the camshaft side of the cylinder head.

    6. If a valve guide will not move, drill it out with an 8 mm (5/16) drill bit, then try again.

    NOTE:  Drill guides only in extreme cases; you could damage the cylinder head if the valve guide breaks.
  3. Valve Guide - Install
    GHH308279Courtesy of HONDA, U.S.A., INC.
    		 1. Take out a new valve guide(s) from the freezer, one at a time, as you need them.

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

    3. Install the valve guide from the camshaft side of the cylinder head; use the valve guide driver to drive the valve guide in to the specified installed height (A) of the valve guide (B). If you have all 24 valve guides to do, you may have to reheat the cylinder head.


    Valve Guide Installed Height 
    Intake: 21.2-22.2 mm (0.835-0.874 in) 
    Exhaust: 20.6-21.6 mm (0.811-0.850 in) 
    GHH308280Courtesy 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 valve guide reamer clockwise while removing it from the bore.

    7. Thoroughly wash the valve guide in detergent and water to remove any cutting residue.
  4. Valve Stem-to-Guide Clearance - Inspect 

    NOTE:  Verify that a valve slides into the intake and exhaust valve guides without sticking.

  5. Valve Seat - Inspect 

    NOTE:  If necessary renew the valve seat using a valve seat cutter.

  6. All Removed Parts - Install
    1. Install the parts in the reverse order of removal.
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