K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Important:
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Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may
affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
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The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
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Do not apply sealant to the first three threads of the bolt.
2. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 or equivalent to the threads of the exhaust manifold bolts.
3. Install the exhaust manifold, NEW gasket and bolts.
3.1.
Tighten the exhaust manifold 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 exhaust manifold 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. Apply a light coating of clean engine oil to a NEW O-ring seal and install the seal onto the EGR valve pipe.
6. Install the EGR pipe.
7. Install the EGR valve pipe bolts until snug.
7.1.
Tighten the intake manifold bolt (1) to 10 Nm (89 inch lbs.).
7.2.
Tighten the cylinder head bolts (2) to 50 Nm (37 ft. lbs.).
7.3.
Tighten the exhaust manifold bolts (3) to 30 Nm (22 ft. lbs.).
8. Install the spark plugs. Refer to Spark Plug Replacement in Engine Controls - 4.8L, 5.3L, and 6.OL.
9. Install the ignition coils. Refer to Ignition Coil(s) Replacement in Engine Controls - 4.8L, 5.3L, and 6.OL.
10. Raise the vehicle.
