K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
2. 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.
3. Install the exhaust manifold, NEW gasket and bolts.
3.1.
Tighten the bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from
side-to-side, and work toward the outside bolts.
3.2.
Tighten the bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from
side-to-side, and work toward the outside bolts.
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. Install the ignition coils.
7. Raise the vehicle.
8. Install the exhaust manifold pipe nuts.
Tighten the nuts to 50 Nm (37 ft. lbs.).
9. Lower the vehicle.
