Hydraulic Variable Valve Timing Actuator Inspection
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
- A hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing.
CAUTION:
- Do not disassemble the hydraulic variable valve timing actuator because it is a precision unit.
- Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)] .)
- Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
- Remove the ignition coil/ion sensors. (See IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION .)
- Remove the cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION .)
- Verify that the alignment mark of the holder and alignment mark of the housing on the hydraulic variable valve timing actuator are aligned and fitted.
- If the alignment mark of the holder and alignment mark of the housing are not aligned, rotate the crankshaft in the direction the engine rotates two turns and verify that they are aligned.
- If the alignment mark of the holder and alignment mark of the housing are still not aligned, replace the hydraulic variable valve timing actuator. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION .)
- If, when turning the crankshaft, there is a slapping noise from the hydraulic variable valve timing actuator each time before the cam reaches its maximum lift, it means that the actuator is not secured. Replace the hydraulic variable valve timing actuator. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION .)
- If the alignment mark of the holder and alignment mark of the housing are not aligned, rotate the crankshaft in the direction the engine rotates two turns and verify that they are aligned.
- Install in the reverse order of removal.