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Home >> Mazda >> 2007 >> B4000 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 331 (Engine Mechanical - Overhaul) >> Valve Guide Inspection/Repair >> Valve Seat Inspection

Valve Seat Inspection

WARNING: This page is about a different car, the 2007 Mazda B3000, 2006 Mazda B3000, 2005 Mazda B3000, 2004 Mazda B3000, and 2003 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • After grinding valves or valve seats, check valve clearance.
    NOTE:
    • The finished valve seat should contact the approximate center of the valve face.
    Fig 1: Checking Intake Valve Seat & Intake Valve Angles
    G03312325Courtesy of MAZDA MOTORS CORP.
  1. Check intake valve seat and intake valve angles.
  2. Check exhaust valve seat and exhaust valve angles.
    Fig 2: Check Exhaust Valve Seat & Exhaust Valve Angles
    G03312326Courtesy of MAZDA MOTORS CORP.
  3. Measure the valve seat width. If necessary, grind the valve seat to specification.
    1. Measure the intake valve seat width.
    2. Measure the exhaust valve seat width.
    3. Recheck the valve spring installed length after the seats have been ground, and shim the valve springs as necessary to achieve the correct installed spring length.
      4. Fig 3: Measuring Valve Seat Width
      G03312328Courtesy of MAZDA MOTORS CORP.
  4. Check that the finished valve seat contacts the approximate center of the valve face.
    1. Coat the valve seat with Prussian Blue.
    2. Set the valve in place.
    3. Rotate the valve with light pressure.
    4. Inspect the Prussian Blue transferred to the valve and grind the valve or valve seat as necessary.
  5. Use a valve seat runout gauge to check valve seat runout.
    Fig 4: Measuring Valve Seat Width
    G03312329Courtesy of MAZDA MOTORS CORP.
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