Timing Chain Installation Note

Verify that the timing marks and the key are aligned to the position shown in the figure.

Fig 1: Identifying Cylinder Head Upper Surface Timing Chain Alignment Marks
Courtesy of MAZDA MOTORS CORP.
NOTE:
- The timing mark of SKYACTIV-G 2.5 is not completely parallel with the upper surface of the cylinder head.
- If they are not in the position shown in the figure, rotate the camshaft and crankshaft to set the cylinder No. 1 top dead center (TDC).
Install the timing chain while aligning the marks on each sprocket and the timing chain as shown in the figure.

Fig 2: Identifying Hydraulic Variable Valve Timing Actuator Timing Chain Alignment Marks (1 Of 2)
Courtesy of MAZDA MOTORS CORP.

Fig 3: Identifying Hydraulic Variable Valve Timing Actuator Timing Chain Alignment Marks (2 Of 2)
Courtesy of MAZDA MOTORS CORP.
Install the chain guide (No. 1).
Install the tensioner arm.
Install the chain tensioner.
After installing the chain tensioner, remove the installed wire or paper clip, and then apply tension to the timing chain.
- If a new chain tensioner is used, remove the installed stopper.
  
  Fig 4: Applying Tension To Timing Chain
  Courtesy of MAZDA MOTORS CORP.
Verify that there is no looseness in the timing chain, and re-verify that each sprocket is in the specified location.
Rotate the crankshaft clockwise two turns and inspect the valve timing.

Fig 5: Identifying Timing Marks On Cylinder Head Upper Surface
Courtesy of MAZDA MOTORS CORP.
NOTE:
- The timing mark of SKYACTIV-G 2.5 is not completely parallel with the upper surface of the cylinder head.