Chevrolet Silverado / GMC Sierra. Service manual — part 2210

Courtesy of GENERAL MOTORS CORP.

3. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N

10953488), or equivalent, to the threads of the exhaust manifold bolts. Refer to Sealers,
Adhesives, and Lubricants .

4. Install the exhaust manifold, NEW gasket and bolts.

Tighten:

1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust

manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work
toward the outside bolts.

2. Tighten the exhaust manifold bolts a final pass to 20 N.m (15 lb ft). Tighten the

exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side,
and work toward the outside bolts.

5. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of

the left cylinder head.

OIL LEVEL INDICATOR AND TUBE INSTALLATION

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 91: View Of Oil Level Indicator, Tube Bolt, Indicator Tube & O-Ring Seal
Courtesy of GENERAL MOTORS CORP.

1. Inspect the O-ring seal (421) for cuts or damage. If the oil level indicator tube O-ring seal is

not cut or damaged, it may be used again.

2. Lubricate the O-ring seal with clean engine oil.

3. Install the O-ring seal onto the oil level indicator tube (420).

4. Install the oil level indicator tube into the engine block and rotate into proper position.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

5. Install the tube bolt (419).

Tighten: Tighten the oil level indicator tube bolt to 25 N.m (18 lb ft).

6. Install the oil level indicator (418) into the tube.

AUTOMATIC TRANSMISSION FLEX PLATE INSTALLATION

Fig. 92: View Of Flex Plate & Bolts
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

1. Install the flex plate to the crankshaft.

2. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the

threads of the flex plate bolts.

Fig. 93: Identifying Flywheel Bolt Tightening Sequence

IMPORTANT: The flex plate does not use a locating pin for alignment and

will not initially seat against the crankshaft flange, but will
be pulled onto the crankshaft by the engine flex plate bolts.
This procedure requires a 3 stage tightening process.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado