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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 153 (ENGINE MECHANICAL (SERVICE INFORMATION L3))OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION
1999 Mazda 626 ES, 2.5 D, Standard

Oil Control Valve (OCV) Removal/Installation

1999 Mazda 626 ES, 2.5 D, StandardSECTION Oil Control Valve (OCV) Removal/Installation
WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable.
  2. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
  3. Remove the high-tension lead. (See HIGH-TENSION LEAD (L3) REMOVAL/INSTALLATION .)
  4. Remove the OCV connector.
  5. Remove the ventilation hose.
  6. Remove the cylinder head cover.
  7. Remove the OCV.
  8. Install the OCV.

    Tightening torque 

    8.0-11.5 N.m {81.6-117.2 kgf.cm, 70.9-101.7 in.lbf} 

  9. Install the cylinder head cover. (See Cylinder Head Cover Installation Note .)
  10. Install the ventilation hose.
  11. Install the OCV connector.
  12. Install the high-tension lead. (See HIGH-TENSION LEAD (L3) REMOVAL/INSTALLATION .)
  13. Install the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Fig 1: Removing/Installing Oil Control Valve
G01025050Courtesy of MAZDA MOTORS CORP.


  1. Disconnect the negative battery cable.
  2. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
  3. Remove the high-tension lead. (See HIGH-TENSION LEAD (L3) REMOVAL/INSTALLATION .)
  4. Remove the OCV connector.
  5. Remove the ventilation hose.
  6. Remove the cylinder head cover.
  7. Remove the OCV.
    Fig 1: Removing/Installing Oil Control Valve
    G01025054Courtesy of MAZDA MOTORS CORP.
  8. Install the OCV.

    Tightening torque 

    8.0-11.5 N.m {81.6-117.2 kgf.cm, 70.9-101.7 in.lbf} 

  9. Install the cylinder head cover. (See Cylinder Head Cover Installation Note .)
  10. Install the ventilation hose.
  11. Install the OCV connector.
  12. Install the high-tension lead. (See HIGH-TENSION LEAD (L3) REMOVAL/INSTALLATION .)
  13. Install the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
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.