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 Marks
Courtesy of MAZDA MOTORS CORP.
Loosen the chain tensioner using the following procedure:
1. Insert a metal rod (diameter approx. 1.4 mm {0.055 in}, length approx. 55 mm {2.2 in}) into the hole in the body of the chain tensioner.
  
  Fig 2: Loosening Chain Tensioner Using Metal Rod
  Courtesy of MAZDA MOTORS CORP.
2. Press the resister ring and unlock the plunger.
  
  Fig 3: Pressing Resister Ring
  Courtesy of MAZDA MOTORS CORP.
3. Press the timing chain in the direction of the arrow and press in the chain tensioner plunger to the position where the groove and body hole are aligned.
  
  Fig 4: Pressing Chain Tensioner Plunger
  Courtesy of MAZDA MOTORS CORP.
4. With the plunger pressed in, further insert the metal rod set in (1) above.
  
  Fig 5: Inserting Metal Rod Set
  Courtesy of MAZDA MOTORS CORP.
  NOTE:
  - The rod secures the plunger and releases the tension.
5. Loosen the power of the hand pressing the plunger and verify that the pressed-in rod does not move.
Remove the chain tensioner, tensioner arm, and the chain guide (No. 1).
Remove the timing chain.