Mazda RX-8 Manual page 1336

Radiator Outer Tank (In Tank Oil Cooler) Assembly Note
1. Install a new O-ring and ensure it is not twisted.
NOTE:
The old O-ring must be replaced.
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2. Position the radiator tank in the original direction to the core using care not to scratch the tank sealing
surface with the header tabs.
NOTE:
Step 3 will set jaw opening to the correct specification.
•
3. With the jaws of locking-type pliers (vise grips) closed and locked, turn the adjusting screw to position
the jaws against the drill bit with the diameter measured (height) in removal procedure 1. Tighten the
lock nut on the adjusting screw against the handle to lock the adjustment in place.
4. Squeeze the header tabs down in the order as shown in the figure against the lip of the radiator outer
tank base with the locking-type pliers while rotating the pliers toward the tank.
(w) RX-8 Transmission (Manual & Auto)
Page 311