Mazda CX-9 Grand Touring 2009 Manual page 1466

Fig. 82: Rotating Crankshaft Counterclockwise
Courtesy of MAZDA MOTORS CORP.
7. Insert an approx. 1.0 mm {0.039 in} thin wire or paper clip into the camshaft timing chain tensioner
(LH) shown in the figure to hold the tensioner piston.
NOTE:
8. Verify that the camshafts (LH) are in the neutral position.
NOTE:
2008 Mazda CX-9 Grand Touring
2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9
When the timing chain removed, valve spring pressure will rotate the
camshaft (LH) approx. 3 ° to a neutral position.
Fig. 83: Inserting Wire Or Paper Clip Into Camshaft Timing Chain
Tensioner (LH)
Courtesy of MAZDA MOTORS CORP.
The cylinder head and the camshaft bearing caps are numbered to
make sure they are reassembled in their original position. When
removed, keep the bearing caps with the cylinder head they were
removed from. Do not mix the caps.