Timing Chain Removal/Installation: Notes

WARNING:

A hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing.

CAUTION:

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: Securing Clearance Between Cam

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: Identifying Cast Hexagon Dimension

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 front under cover No. 2. (See FRONT UNDER COVER No. 2 REMOVAL/INSTALLATION .)
Remove the splash shield (RH). (See SPLASH SHIELD REMOVAL/INSTALLATION .)
Remove the drive belt. (See DRIVE BELT REMOVAL/INSTALLATION .)
Drain the engine oil. (See ENGINE OIL REPLACEMENT .)
Remove the oil pan. (See OIL PAN REMOVAL/INSTALLATION .)
Remove in the order indicated in the table.
Install in the reverse order of removal.
Refill with the specified type and amount of the engine oil. (See ENGINE OIL REPLACEMENT .)

Start the engine and inspect the following:

Leakage of engine oil.
Runout and contact of pulley and belt.

Ignition timing, idle speed and idle mixture. (See ENGINE TUNE-UP .)

Fig 3: Identifying Electric Variable Valve Timing Motor Components With Torque Specifications (2.0L)

Courtesy of MAZDA MOTORS CORP.

COMPONENT DESCRIPTION

1	Dipstick
2	Cylinder head cover (See CYLINDER HEAD COVER REMOVAL NOTE .) (See CYLINDER HEAD COVER INSTALLATION NOTE .)
3	Oil shower pipe (See OIL SHOWER PIPE INSTALLATION NOTE .)
4	Drive belt auto tensioner (See DRIVE BELT AUTO TENSIONER REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
5	Water pump pulley (See WATER PUMP PULLEY REMOVAL NOTE .) (See WATER PUMP PULLEY INSTALLATION NOTE .)
6	Crankshaft pulley lock bolt (See CRANKSHAFT PULLEY LOCK BOLT REMOVAL NOTE .) (See CRANKSHAFT PULLEY LOCK BOLT INSTALLATION NOTE .)
7	Crankshaft pulley
8	Front oil seal (See FRONT OIL SEAL REPLACEMENT [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
9	No. 3 engine mount (See NO. 3 ENGINE MOUNT REMOVAL NOTE .) (See NO. 3 ENGINE MOUNT INSTALLATION NOTE )
10	Electric variable valve timing motor/driver (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSTALLATION NOTE .)
11	Engine front cover (See ENGINE FRONT COVER REMOVAL NOTE .) (See ENGINE FRONT COVER INSTALLATION NOTE .)
12	Chain tensioner (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
13	Tensioner arm (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
14	Chain guide (No.1) (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
15	Timing chain (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
16	Chain guide (No.2)
17	Crankshaft sprocket
18	Oil pump chain tensioner
19	Oil pump driven sprocket (See OIL PUMP DRIVEN SPROCKET REMOVAL NOTE SKYACTIV-G 2.0 .) (See OIL PUMP DRIVEN SPROCKET INSTALLATION NOTE SKYACTIV-G 2.0 .)
20	Oil pump chain
21	Oil pump drive sprocket
22	Key

Fig 4: Identifying Electric Variable Valve Timing Motor Components With Torque Specifications (2.5L)

Courtesy of MAZDA MOTORS CORP.

COMPONENT DESCRIPTION

1	Dipstick
2	Cylinder head cover (See CYLINDER HEAD COVER REMOVAL NOTE .) (See CYLINDER HEAD COVER INSTALLATION NOTE .)
3	Oil shower pipe (See OIL SHOWER PIPE INSTALLATION NOTE .)
4	Drive belt auto tensioner (See DRIVE BELT AUTO TENSIONER REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
5	Water pump pulley (See WATER PUMP PULLEY REMOVAL NOTE .) (See WATER PUMP PULLEY INSTALLATION NOTE .)
6	Crankshaft pulley lock bolt (See CRANKSHAFT PULLEY LOCK BOLT REMOVAL NOTE .) (See CRANKSHAFT PULLEY LOCK BOLT INSTALLATION NOTE .)
7	Crankshaft pulley
8	Front oil seal (See FRONT OIL SEAL REPLACEMENT [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
9	No. 3 engine mount (See NO. 3 ENGINE MOUNT REMOVAL NOTE .) (See NO. 3 ENGINE MOUNT INSTALLATION NOTE .)
10	Electric variable valve timing motor/driver (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSTALLATION NOTE .)
11	Engine front cover (See ENGINE FRONT COVER REMOVAL NOTE .) (See ENGINE FRONT COVER INSTALLATION NOTE .)
12	Chain tensioner (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
13	Tensioner arm (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
14	Chain guide (No.1) (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
15	Timing chain (See TIMING CHAIN REMOVAL NOTE .) (See TIMING CHAIN INSTALLATION NOTE .)
16	Chain guide (No.2)
17	Crankshaft sprocket
18	Oil pump chain tensioner (See OIL PUMP CHAIN REMOVAL NOTE SKYACTIV-G 2.5 .) (See OIL PUMP CHAIN INSTALLATION NOTE SKYACTIV-G 2.5 .)
19	Balancer shaft sprocket (See OIL PUMP CHAIN REMOVAL NOTE SKYACTIV-G 2.5 .) (See OIL PUMP CHAIN INSTALLATION NOTE SKYACTIV-G 2.5 .)
20	Oil pump chain (See OIL PUMP CHAIN REMOVAL NOTE SKYACTIV-G 2.5 .) (See OIL PUMP CHAIN INSTALLATION NOTE SKYACTIV-G 2.5 .)
21	Oil pump driven sprocket (See OIL PUMP CHAIN REMOVAL NOTE SKYACTIV-G 2.5 .) (See OIL PUMP CHAIN INSTALLATION NOTE SKYACTIV-G 2.5 .)
22	Oil pump chain guide
23	Oil pump drive sprocket
24	Key