Mazda CX-9 Grand Touring 2009 Manual page 1451

2. Place alignment marks on the timing chain corresponding to each of the alignment marks on the timing
sprocket.
Fig. 58: View Of Alignment Marks On Timing Chain
Courtesy of MAZDA MOTORS CORP.
3. Push down the link plate of the timing chain tensioner and release the plunger lock.
NOTE:
2008 Mazda CX-9 Grand Touring
2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9
Fig. 57: Identifying Timing Chain Component
Courtesy of MAZDA MOTORS CORP.
The plunger should retract with minimal force. If binding occurs,
remove the chain tensioner from the vise and reset it in the vise.