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Cylinder Head: Valves

WARNING: This page is about a different car, the 2001 Mazda Millenia and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure valve length, stem diameter, head diameter and valve margin are within specification. See VALVES & VALVE SPRINGS  table under ENGINE SPECIFICATIONS.
  2. To check valve installed height, ensure valve is within minimum refinish length. See VALVES & VALVE SPRINGS  table under ENGINE SPECIFICATIONS.
  3. Install valve in cylinder head. Using caliper, measure valve protrusion from top of valve stem to spring seat on cylinder head. See Fig 1. If valve stem protrusion is 1.634-1.654" (41.50-42.00 mm), valve and cylinder head can be used without installing washer on valve spring seat.
  4. If valve stem protrusion is 1.658-1.692" (42.10-43.00 mm), install washer on valve spring seat so distance is 1.634" (41.50 mm). If valve stem protrusion exceeds 1.697" (43.10 mm) replace cylinder head.
Fig 1: Measuring Valve Installed Height
G93I02456Courtesy of MAZDA MOTORS CORP.
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