Timing Chain Installation Note

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

Fig 1: Locating Timing Marks And Key Alignment Position
Courtesy of MAZDA MOTORS CORP.
NOTE:
- The timing mark of SKYACTIV-G 2.5 is not 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 the timing chain as shown in the figure.

Fig 2: Locating Timing Chain Alignment Marks
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. (Chain tensioner (type A))
- If a new chain tensioner is used, remove the installed stopper.
Fig 3: Removing Stopper From Link Plate
Courtesy of MAZDA MOTORS CORP.
After installing the timing chain tensioner, remove the installed rod, and then apply tension to the timing chain. (Chain tensioner (type B))
- If a new chain tensioner is used, remove the installed lock pin.
Fig 4: Locating Lock Pin Of Chain Tensioner
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: Locating Timing Marks Position

Courtesy of MAZDA MOTORS CORP.

NOTE:

The timing mark of SKYACTIV-G 2.5 is not parallel with the upper surface of the cylinder head.