Only vehicles with the 3.4L (VIN X) Double Over Head Camshaft (DOHC) engine use a timing belt in conjunction with a timing chain. All other engines use combinations of sprockets and timing chains. Any engine's valve timing is critical to the engine's operation. This is especially the case of any belt-driven over head camshaft engine. In the 3.4L (VIN X) engine, the combination of four camshafts, 24 valves, and tight clearances means that if the belt should slip or otherwise get "out of time", expensive engine damage will result. The timing belt should be inspected for cracks, wear and other damage at 60,000 miles (100,000 km) and then every 15,000 miles (25,000 km). Replace the belt and/or tensioner as needed.
For the timing belt removal and installation procedure, please refer to Section 3 of this manual.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions Section.
Remove or disconnect the following:
Negative battery cable
- Rotate the crankshaft clockwise to 60 degrees before top dead center (BTDC).
- Loosen the timing belt tensioner and idler pulleys.
- Remove the timing belt.
- Start at the crankshaft sprocket and install the timing belt with the double dash (TDC) aligned with the marks on the oil pump and on the belt drive gear.
Set the initial timing belt tension as follows:
- Turn the tensioner nut COUNTERCLOCKWISE to full stop, then, turn the nut back until the reference mark is 1 mm (0.003 in) over the flange.
- Tighten the timing belt tensioner locking nut until snug, the locking nut will be tightened to specifications after all final adjustments are made.
- Rotate the engine in the clockwise direction two revolutions stopping at 60 degrees BTDC.
- Inspect the alignment of the reference marks on the camshaft gears with the notches on the rear timing belt cover, as well as, the mark on the crankshaft sprocket and oil pump housing.
If timing belt adjustment IS NOT required, set the final timing belt tension:
- Loosen the timing belt tensioner locking nut.
- Turn the locking nut counterclockwise to full stop, then back until the reference mark is 2-4 mm (0.078-0.157 in) ABOVE the reference mark on the flange.
- Tighten the timing belt tensioner locking nut 15 ft. lbs. (20 Nm).
- Tighten the idler pulley bolts to 30 ft. lbs. (40 Nm).
Install or connect the following:
Crankshaft balancer. Torque the bolts to 15 ft. lbs. (20 Nm).