Mazda RX-8 Workshop Manual page 1037

If the retainer and cap cannot be tighten by hand, remove the cap, verify that there is no damage or misalignment
on the retainer and cap, and then tighten again.
CAUTION:
The cap could be damaged if the SST is used with any play between the cap and the SST. Securely attach the SST
so that there is no gap between the SST tabs and the side of the cap.
3. While keeping the alignment mark and the retainer notch aligned, tighten the cap to the rotation angle and specified torque using
the SST.
If the specified torque cannot be obtained even when the cap is rotated to the specified rotation angle, replace with
a new cap and retainer and repeat Step 3.
Rotation angle (Total angle for Step 2 and Step 3)
580—620°
Cap tightening torque (approx.)
80—180 N·m {8.2—18 kgf·m, 60—132 ft·lbf}
Joint Hose Installation Note
1. Install the joint hose and clamps as shown in the figure.
Breather Hose Installation Note
1. Install the breather hose and clamps as shown in the figure.