Chevrolet Silverado / GMC Sierra. Service manual — part 2110

Clean the following components:

Remove all sludge, dirt, or debris using a cleaning solvent or thermal type oven. Refer to
Cleanliness and Care .

Gasket surfaces

Refer to Replacing Engine Gaskets .

Coolant passages

Oil galleries

Main bearing caps

Cylinder head bolt holes to remove threadlocking material

Thread repair tool J 42385-107 may be used to clean the threads of any residual
threadlocking material.

Inspection Procedure

1. Inspect the following components:

Cylinder walls for excessive scratches, gouging, or ring ridge

Cylinder bores for excessive ring ridge at the top of the cylinder

Coolant jacket for cracks

Valve lifter bores for excessive scoring or wear

Crankshaft bearing webs for cracks

Gasket sealing surfaces for excessive scratches or gouging

Refer to Replacing Engine Gaskets .

Oil galleries for restrictions

Threaded bolt holes for damaged threads

Cylinder bores for excessive ring ridge at the top of the cylinder

2. Measure the cylinder bores for an oversize condition:

Measuring the Cylinder for Oversize

IMPORTANT: When cleaning the engine block in a thermal type oven, do not

exceed 232°C (450°F).

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. 305: Measuring Bore Gauge With Micrometer
Courtesy of GENERAL MOTORS CORP.

1. Adjust the micrometer to a dimension slightly smaller than the bore size. Refer to Engine

Mechanical Specifications (RPO LY5 VIN J) or Engine Mechanical Specifications
(RPO LC9 VIN 3) or Engine Mechanical Specifications (RPO LY2 VIN C) or Engine
Mechanical Specifications (RPO LH6 VIN M) or Engine Mechanical Specifications
(RPO LMG VIN 0) or Engine Mechanical Specifications (RPO LY6 VIN K) or
Engine Mechanical Specifications (RPO L76 VIN Y) or Engine Mechanical
Specifications (RPO L92 VIN 8) .

2. Insert the J 8087 into the micrometer and zero the bore gage dial.

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. 306: Measuring Cylinder Bore
Courtesy of GENERAL MOTORS CORP.

3. Use the J 8087 and measure the cylinder bore for oversize.

Slide the bore gage up and down throughout the length of the cylinder bore. Measure the
bore, both parallel and perpendicular to the centerline of the crankshaft, at the top, center,

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

and bottom of the bore. A cylinder bore that exceeds the maximum diameter must be
serviced with an oversized piston. Refer to Engine Mechanical Specifications (RPO LY5
VIN J) or Engine Mechanical Specifications (RPO LC9 VIN 3) or Engine Mechanical
Specifications (RPO LY2 VIN C) or Engine Mechanical Specifications (RPO LH6
VIN M) or Engine Mechanical Specifications (RPO LMG VIN 0) or Engine
Mechanical Specifications (RPO LY6 VIN K) or Engine Mechanical Specifications
(RPO L76 VIN Y) or Engine Mechanical Specifications (RPO L92 VIN 8) .

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