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Home >> Mazda >> 1994 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.8L 4-CYL >> Overhaul >> Cylinder Head >> Valve Guides

Valve Guides

  1. Check valve stem-to-valve guide oil clearance. Ensure valve guide inside diameter is within specification. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS.
  2. Completely disassemble cylinder head. Gradually heat cylinder head in water to 194°F (94°C). Using Valve Guide Remover (49-B002-005), drive valve guide out, working from combustion chamber side of cylinder head. Repeat procedure if required, keeping cylinder head hot so aluminum head will not warp.
  3. If required, install new circlip on guide. Using proper components of Valve Guide Installer (49-L012-0A0), adjust installer guide depth (dimension "L") to specification using depth micrometer or caliper. See VALVE GUIDE INSTALLED HEIGHT  table. See Fig 1.
  4. Insert guide into pre-adjusted installer, and drive guide into cylinder head from camshaft side until guide circlip and/or installer contact cylinder head. Measure dimension "L" (guide installed height). See Fig 1 or Fig 2. If installed height is not within specification, adjust or replace valve guide or cylinder head as necessary.
VALVE GUIDE INSTALLED HEIGHT

Application In. (mm)
Miata .720-.744 (18.30-18.90)
Fig 1: Adjusting Valve Guide Installer & Installing Guide
G91H01847Courtesy of MAZDA MOTORS CORP.
Fig 2: Measuring Installed Valve & Guide Height
G99107Courtesy of MAZDA MOTORS CORP.
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