from 07 service manual for a diesel.
CAUTION: Do not let tensioner arm snap back to the freearm position, severe damage may occur to the tensioner.
1. Disconnect negative battery cable.
2. Rotate belt tensioner until it contacts its stop. Remove belt, then slowly rotate the tensioner into the freearm position.
3.0L DIESEL INSTALL
1. Check condition of all pulleys.
CAUTION: When installing the accessory drive belt, the belt MUST be routed correctly. If not, the engine may overheat due to the water pump rotating in the wrong direction.
2. Install new belt. Route the belt around all pulleys except the idler pulley . Rotate the tensioner arm until it contacts its stop position. Route the belt around the idler and slowly let the tensioner rotate into the belt. Make sure the belt is seated onto all pulleys .
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