Timing Chain Removal Note

Rotate the crankshaft clockwise to align the timing marks and the key position as shown in the figure, and set cylinder No. 1 at top dead center (TDC).

Fig 1: Aligning Timing Mark And Key Position
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.
While moving the exhaust camshaft back and forth in the direction of the arrow using a wrench on the cast hexagon, press down the link plate of the timing chain tensioner using a precision screwdriver and release the plunger lock.

Fig 2: Moving Exhaust Camshaft Back And Forth Using Wrench
Courtesy of MAZDA MOTORS CORP.

Fig 3: Pressing Down Link Plate Of Timing Chain Tensioner Using Screwdriver
Courtesy of MAZDA MOTORS CORP.
NOTE:
- When moving the exhaust camshaft back and forth, the timing chain pushes the plunger in the chain tensioner making it easier to operate the link plate.
Push back the plunger slowly in the direction shown in the figure with the link plate still pushed down.

Fig 4: Pushing Back Plunger
Courtesy of MAZDA MOTORS CORP.
Remove the screwdriver from the link plate with the plunger still pushed down.
Release the force slightly from the plunger, and move it back and forth 2-3 mm {0.08-0.11 in} .
Insert a wire with an approx. diameter of 1.5 mm {0.059 in} or a paper clip where the link plate hole and the tensioner body hole overlap to secure the link plate and lock the plunger.

Fig 5: Inserting Wire In Link Plate And Tensioner Body Hole
Courtesy of MAZDA MOTORS CORP.
Remove the chain tensioner, tensioner arm, and the chain guide (No. 1).
Remove the timing chain.