Chevrolet Silverado / GMC Sierra. Service manual — part 388

SEALERS, ADHESIVES, AND LUBRICANTS

Valve Springs-Valve Spring Free Length -
Production Value

56.6 mm

2.2283 in

Valve Springs-Valve Spring Installed Height -
Production Value

41 mm

1.6142 in

Valve Springs-Valve Spring Load - Exhaust -
Service Limit

275 N at 41 mm

61.8 lb at 1.61 in

Valve Springs-Valve Spring load - Exhaust -
Production Value

315-363 N at 41

mm

71-81.6 lb at 1.61

in

Valve Springs-Valve Spring Load - Intake -
Service Limit

306 N at 41 mm

68.8 lb at 1.61 in

Valve Springs-Valve Spring Load - Intake -
Production Value

315-363 N at 41

mm

71-81.6 lb at 1.61

in

Application

Type of Material

GM Part Number

United

States

Canada

Sealing Cup Plug

Locktite 272T or

Equivalent

12345493

10953488

Upper Oil Pan to Cylinder Block

Sealant

12378521

88901148

Flywheel Housing to Cylinder Block

Sealant

12378521

88901148

Engine Front Cover to Cylinder Block

Sealant

12378521

88901148

Lower Oil Pan to Upper Oil Pan

Sealant

12378521

88901148

Crankshaft Bearing Side Cap Bolts

Sealant

12346004

10953480

Intake Manifold to Cylinder Head

Sealant

12378521

88901148

Camshaft Bearing

Engine Oil

12345634

993297

Rocker Arm Shaft

Engine Oil

12345634

993297

Valve Bridge Cap

Engine Oil

12345634

993297

Valve Stem Seal

Engine Oil

12345634

993297

Valve Lifter

Engine Oil

12345634

993297

Piston Ring

Engine Oil

12345634

993297

Crankshaft Bearing

Engine Oil

12345634

993297

Connecting Rod Bearing

Engine Oil

12345634

993297

Thrust Bearing

Engine Oil

12345634

993297

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

CONNECTING ROD BEARINGS SELECTION SPECIFICATIONS

Connecting Rod Bearing Grade

CYLINDER HEAD GASKET SELECTION SPECIFICATIONS

Camshaft Bearing

Engine Oil

12345634

993297

Camshaft

Engine Oil

12345634

993297

Connecting Rod Small End Bushing

Engine Oil

12345634

993297

Push Rod

Engine Oil

12345634

993297

Crankshaft Bearing Cap Bolt

Molybdenum

Disulfide

1052948

992926

Lithium Grease

Lubricant

12346293

-

Parts Cleaner

Cleaner

12377981

10953463

Connecting

Rod Grade

(Stamped on

Connecting

Rod)

Use This

Bearing

Color

Bearing Thickness

Oil Clearance

Metric (mm) English (in) Metric (mm) English (in)

A

Green

2.007 - 2.013

0.0790 -

0.0793

0.037 - 0.076

0.0015 -

0.0030

B

Yellow

2.011 - 2.017

0.0792 -

0.0794

0.037 - 0.076

0.0015 -

0.0030

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 1: View Of Cylinder Head Gasket Selection Marks
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

1

Grade A

2

Grade B

3

Grade C

4

Block Over-Bored

5

Block Over-Bored and Deck Milled

Cylinder Head

Gasket Grade

Ti Max (Piston Projection)

Compressed Gasket Thickness

Metric (mm)

English (in)

Metric (mm)

English (in)

Grade A

0.223 -0.274

0.0088 -0.0108

0.90-1.00

0.0354-0.0394

Grade B

0.274-0.325

0.0108-0.0128

0.95-1.05

0.0374-0.0413

Grade C

0.325-0.376

0.0128-0.0148

1.00-1.10

0.0394-0.0433

Block Over-

Bored 0.010-

0.030 in (0.254-

0.762 mm)

0.223-0.376

0.0088-0.0148

1.00-1.10

0.0394-0.0433

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

CRANKSHAFT BEARING SELECTION SPECIFICATIONS

VALVE CLEARANCE ADJUSTMENT SPECIFICATIONS

THREAD REPAIR SPECIFICATIONS

Cylinder Head - Exhaust View

Block Over-

Bored 0.010-

0.030 in (0.254-

0.762 mm) and

Deck Milled

0.008 in (0.203

mm)

0.4257-0.5777

0.0168-0.0228

1.25-1.35

0.0492-0.0532

Cylinder Block

Grade

Crankshaft

Journal Grade

Identification

Bearing Color

Oil Clearance

Metric (mm)

English (in)

1

1

Black

0.041-0.068

0.0016-0.0027

1

2

Brown

0.039-0.065

0.0015-0.0026

2

1

Blue

0.043-0.070

0.0017-0.0028

2

2

Black

0.041-0.067

0.0016-0.0027

Cylinder

Adjust at No 1

Compression Stroke TDC

Adjust at No 1 Exhaust

Stroke TDC

Left Bank

Right Bank

Intake

Exhaust

Intake

Exhaust

-

1

X

X

-

-

2

-

-

X

X

-

-

3

X

-

-

X

4

-

-

-

X

X

-

5

X

-

-

X

6

-

X

-

-

X

-

7

-

X

X

-

8

-

-

X

X

-

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado