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Home >> Acura >> 2017 >> RLX Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Engine Control System / Engine Mechanical - Service, Testing & Troubleshooting (Except Hybrid) >> Replacement >> Valve Guide >> Replacement

Valve Guide: Replacement

  1. Valve Seal and Valve Spring Seat - Remove

    Remove the valve seal and the valve spring seat .

  2. Valve Guide - Remove
    GHH345624Courtesy 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.
    GHH345625Courtesy of HONDA, U.S.A., INC.
    		 3. Use a hot plate or an 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.
    GHH345626GHH345627Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    GHH345626GHH345627Courtesy 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 head over, and drive the valve guide out toward the camshaft side of the head.

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

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

    GHH345628Courtesy of HONDA, U.S.A., INC.

    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 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 head.

    Valve Guide Installed Height 
    Intake:  21.20-22.20 mm (0.8346-0.8740 in) 
    Exhaust:  20.60-21.60 mm (0.8110-0.8504 in) 
    GHH345629Courtesy 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 reamer clockwise the full length of the valve guide bore.

    6. Continue to rotate the 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

    Check the clearances with a valve . Verify that a valve slides into the intake and exhaust valve guides without sticking.

  5. Valve Seat - Inspect

    Inspect the valve seating . If necessary renew the valve seat using a valve seat cutter.

  6. Valve Seal and Valve Spring Seat - Install

    Install the valve seal and the valve spring seat .

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