Envoy 2WD V8-5.3L VIN M (2005)
1. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads of the exhaust
manifold bolts.
2. Install the exhaust manifold NEW gasket and bolts.
Tighten
1. Tighten the bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and
work toward the outside bolts.
2. Tighten the bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and
work toward the outside bolts.
3. Install the heat shield, and bolts to the exhaust manifold.
Tighten
Tighten the bolts to 9 Nm (80 inch lbs.).
4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head.
5. Install the spark plugs.
6. Raise the vehicle.
7. Install the nuts that secure the catalytic converter to the left exhaust manifold.
Tighten
Tighten the nuts to 50 Nm (37 ft. lbs.).
8. Lower the vehicle.
