Electric Variable Valve Timing Actuator, Hydraulic Variable Valve Timing Actuator Removal/Installation: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. 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 electric variable valve timing actuator and hydraulic variable valve timing actuator because they are precision units.
If the camshaft is rotated with the timing chain removed and the piston at the top dead center position, the valve may contact the piston and the engine could be damaged. When rotating the camshaft with the timing chain removed, rotate it after lowering the piston from the top dead center position.
When rotating the camshaft using a wrench on the cast hexagon, the wrench may contact the rocker arm and damage the rocker arm. To prevent damage to the rocker arm when holding the camshaft on the cast hexagon, use a wrench on the rear side of the engine as shown in the figure to secure a clearance between the cam.

Fig 1: Rotating Camshaft With Timing Chain

Courtesy of MAZDA MOTORS CORP.

NOTE:

Width at the cast hexagon of the camshaft is 22-24 mm {0.87-0.94 in}.

Fig 2: Checking Width At Cast Hexagon Of Camshaft

Courtesy of MAZDA MOTORS CORP.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
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 .)
Remove the front under cover No. 2. (See FRONT UNDER COVER No. 2 REMOVAL/INSTALLATION .)
Remove the electric variable valve timing motor/driver. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION .)
Remove the vacuum pump. (Only when hydraulic variable valve timing actuator is removed.) (See VACUUM PUMP REMOVAL/INSTALLATION .)
Remove the high pressure fuel pump and rear housing. (Only when hydraulic variable valve timing actuator is removed.) (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION .)
Remove in the order indicated in the table.
Install in the reverse order of removal.
Start the engine and inspect the following:
- Ignition timing, idle speed and idle mixture. (See ENGINE TUNE-UP .)

Fig 3: Removing/Installing Electric Variable Valve Timing Actuator Components With Torque Specification

Courtesy of MAZDA MOTORS CORP.

COMPONENT DESCRIPTION

1	Oil shower pipe (See Oil Shower Pipe Installation Note .)
2	Timing chain (See Timing Chain Removal Note .) (See Timing Chain Installation Note .)
3	Chain guide (No. 1)
4	Electric variable valve timing actuator (See Electric Variable Valve Timing Actuator Removal Note .) (See Electric Variable Valve Timing Actuator Installation Note .)
5	OCV
6	Hydraulic variable valve timing actuator and exhaust camshaft component (See Hydraulic Variable Valve Timing Actuator and Exhaust Camshaft Component Removal Note .) (See Hydraulic Variable Valve Timing Actuator and Exhaust Camshaft Component Installation Note .)
7	OCV oil filter
8	Hydraulic variable valve timing actuator (See Hydraulic Variable Valve Timing Actuator Removal Note .) (See Hydraulic Variable Valve Timing Actuator Installation Note .)