Chevrolet Silverado / GMC Sierra. Service manual — part 2165

Fig. 176: Crankshaft Main Bearing Cap Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

8. Tighten the bearing cap M10 bolts (1-10).

Tighten: Tighten the M10 bearing cap bolts (1-10) a first pass in sequence to 20 N.m (15 lb
ft).

9. Using a plastic-face hammer, tap the crankshaft rearward, then forward in order to align the

thrust bearings.

Tighten:

1. Tighten the M10 bolts (1-10) a final pass in sequence 80 degrees using the J 45059 .

NOTE:

Refer to Fastener Notice .

IMPORTANT: To properly align the crankshaft thrust bearings, the final

thrust of the crankshaft MUST be in the forward direction.

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

2. Tighten the M10 studs (11-20) a first pass in sequence to 20 N.m (15 lb ft).

3. Tighten the M10 studs (11-20) a final pass in sequence 51 degrees using the J 45059 .

4. Tighten the bearing cap side M8 bolts to 25 N.m (18 lb ft).

Tighten the bolt on 1 side of the bearing cap and then tighten the bolt on the opposite
side of the same bearing cap.

Fig. 177: CKP Sensor, Bolt & O-Ring
Courtesy of GENERAL MOTORS CORP.

10. Install the CKP sensor.

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. Inspect the CKP sensor O-ring seal (750). If the O-ring seal is not cut or damaged, it

may be used again.

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

3. Install the O-ring onto the sensor.

4. Install the sensor (701). Rotate the sensor until the locating hole in the bracket aligns

with the bolt hole in the block.

5. Install the sensor bolt (702).

Tighten: Tighten the CKP sensor bolt to 25 N.m (18 lb ft).

Fig. 178: Measuring Crankshaft End Play
Courtesy of GENERAL MOTORS CORP.

11. Measure the crankshaft end play.

1. Thrust the crankshaft forward or rearward.

2. Insert a feeler gage between the center crankshaft bearing and the bearing surface of

the crankshaft and measure the bearing clearance.

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

The proper crankshaft end play clearance is 0.04-0.2 mm (0.0015-0.0078 in).

3. If the bearing clearance is not within specifications, inspect the thrust surfaces for

nicks, gouges or raised metal. Minor imperfections may be removed with a fine stone.

PISTON, CONNECTING ROD, AND BEARING INSTALLATION

Tools Required

J 8037 Piston Ring Compressor

J 8087 Cylinder Bore Gage

J 41556 Connecting Rod Guide. See Special Tools .

J 45059 Angle Meter

Piston Selection

Fig. 179: Measuring Piston Outside Diameter
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Measurements of all components should be taken with the

components at normal room temperature. For proper piston
fit, the engine block cylinder bores must not have excessive
wear or taper. A used piston, pin, and connecting rod

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