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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 63 (ENGINE CONTROLS [SYSTEM & COMPONENT TESTING])VARIABLE VALVE TIMING SYSTEMVARIABLE VALVE TIMING ACTUATORMAZDA6 (3.0L)
1999 Mazda 626 ES, 2.5 D, Standard

Mazda6 (3.0L)

1999 Mazda 626 ES, 2.5 D, StandardSECTION Mazda6 (3.0L)
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the cylinder head cover. See VALVE COVER under REMOVAL & INSTALLATION in appropriate article in ENGINES.
  2. Confirm key groove on rotor and timing mark on sprocket of variable valve timing actuator are aligned and fitted. See Fig 1.
    • If key groove and timing mark are not aligned, rotate crankshaft clockwise one rotation and then counterclockwise one rotation. Verify key groove and timing mark are aligned.
    • If key groove and timing mark are still not aligned, replace variable valve timing actuator. Refer to VARIABLE VALVE TIMING ACTUATOR under VARIABLE VALVE TIMING SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article.
    • If, when rotating crankshaft, there is a hitting noise from variable valve timing actuator each time cam passes fully lifted position, it means variable valve timing actuator is not secured. Replace variable valve timing actuator.
Fig 1: Identifying Variable Valve Timing Actuator Alignment Marks - Mazda6 (3.0L)
G00193585Courtesy of MAZDA MOTORS CORP.
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.
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  • • 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.