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HOMESERVICE MANUALSHONDA2009S2000 BASEREPAIR AND DIAGNOSISENGINE MECHANICALMECHANICALCYLINDER HEADVALVE SEAT RECONDITIONING
2009 Honda S2000 Base

Valve Seat Reconditioning

2009 Honda S2000 BaseSECTION Valve Seat Reconditioning
  1. Inspect valve stem-to-guide clearance (see VALVE STEM-TO-GUIDE CLEARANCE INSPECTION  ). If the valve guides are worn, replace them (see VALVE STEM-TO-GUIDE CLEARANCE INSPECTION  ) before cutting the valve seats.
  2. Renew the valve seats in the cylinder head using a valve seat cutter.
    Fig 1: Renewing Valve Seats In Cylinder Head Using Valve Seat Cutter
    G03692361Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Carefully cut a 45 ° seat, removing only enough material to ensure a smooth and concentric seat.
  4. Bevel the upper edge of the seat with the 32 ° cutter and the lower edge of the seat with the 60 ° cutter. Check the width of the seat and adjust accordingly.
    Fig 2: Identifying Cutter Degrees For Beveling Upper Edge Of Seat And Lower Edge Of Seat
    G03692362Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Make one more very light pass with the 45 ° cutter to remove any possible burrs caused by the other cutters.

    Valve Seat Width 

    Intake: 

    Standard (New): 1.05-1.35 mm (0.041-0.053 in.) 

    Service Limit: 1.80 mm (0.071 in.) 

    Exhaust: 

    Standard (New): 1.25-1.55 mm (0.049-0.061 in.) 

    Service Limit: 2.00 mm (0.079 in.) 

  6. After resurfacing the seat, inspect for even valve seating. Apply Prussian Blue compound (A) to the valve face. Insert the valve in its original location in the head, then lift it and snap it closed against the seat several times.
    Fig 3: Applying Prussian Blue Compound To Valve Face
    G03692363Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. The actual valve seating surface (B), as shown by the blue compound, should be centered on the seat.
    • If it is too high (closer to the valve stem), you must make a second cut with the 60 ° cutter to move it down, then one more cut with the 45 ° cutter to restore seat width.
    • If it is too low (close to the valve edge), you must make a second cut with the 32 ° cutter to move it up, then make one more cut with the 45 ° cutter to restore seat width.
    NOTE: The final cut should always be made with the 45 ° cutter.
  8. Insert the intake and exhaust valves in the head and measure valve stem installed height (A).

    Intake Valve Stem Installed Height 

    Standard (New): 44.1-44.4 mm (1.736-1.748 in.) 

    Service Limit: 44.7 mm (1.760 in.) 

    Exhaust Valve Stem Installed Height 

    Standard (New): 44.2-44.5 mm (1.740-1.752 in.) 

    Service Limit: 44.8 mm (1.764 in.) 

    Fig 4: Identifying Valve Stem Installed Height
    G03692364Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. If valve stem installed height is over the service limit, replace the valve and recheck. If it is still over the service limit, replace the cylinder head; the valve seat in the head is too deep.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.