Chevrolet Silverado / GMC Sierra. Service manual — part 6

9

Engine Front Cover Bolt

10

Engine Front Cover

11

Crankshaft Sprocket

12

Crankshaft

13

Crankshaft Balancer Key

14

Crankshaft Lower Bearing

15

Crankshaft Upper Bearing

16

Crankshaft Rear Oil Seal Housing Gasket

17

Crankshaft Rear Oil Seal Retainer Stud

18

Crankshaft Rear Oil Seal Housing

19

Crankshaft Rear Oil Seal Housing Bolt

20

Crankshaft Rear Oil Seal

21

Flywheel

22

Flywheel Bolt

23

Crankshaft Rear Oil Seal Housing Bolt

24

Crankshaft Rear Oil Seal Housing Bolt

25

Crankshaft Rear Oil Seal Housing Stud

26

Oil Pan Nut

27

Crankshaft Rear Oil Seal Housing Locating Pin

28

Crankshaft Upper Bearing

29

Crankshaft Bearing Cap

30

Oil Pump Location Pin

31

Oil Pump Drive Shaft

32

Oil Pump Drive Clamp Bolt

33

Oil Pump Bolt

34

Oil Pan Gasket

35

Oil Pan Baffle Bolt

36

Oil Pan Baffle

37

Oil Pan

38

Oil Pan Drain Plug

39

Oil Pan Drain Plug Seal

40

Oil Pan Bolt

41

Oil Pump Screen

42

Oil Pump

43

Crankshaft Bearing Cap Bolt

44

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

ENGINE IDENTIFICATION

Fig. 6: Engine VIN Locations
Courtesy of GENERAL MOTORS CORP.

Crankshaft Bearing Cap

45

Crankshaft Lower Bearing

46

Crankshaft Position Sensor Reluctor Ring

47

Crankshaft Position Sensor Seal

48

Crankshaft Position Sensor

49

Crankshaft Position Sensor Bolt

50

Crankshaft Balancer Weight

51

Drive Belt Pulley Bolt

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

The Vehicle Identification Number (VIN) Derivative is located on the left side rear of the
engine block (1) or on the right side rear (2) and typically is a 9 digit number stamped or
laser etched onto the engine at the vehicle assembly plant.

The first digit identifies the division.

The second digit identifies the model year.

The third digit identifies the assembly plant.

The fourth through ninth digits are the last six digits of the VIN.

Fig. 7: Engine VIN Numerical Positions
Courtesy of GENERAL MOTORS CORP.

Engines built at the Romulus engine plant have the engine identification number located at
the right front top of the engine block.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

The first digit (1) is the source code.

The second and third digits (2) are the month of build.

The fourth digit (3) is the hour of the build.

The fifth and sixth digits (4) are the date of build.

The seventh, eighth, and ninth digits (5) are the broadcast code.

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - ENGINE MECHANICAL

Begin the system diagnosis by reviewing the Disassembled Views, Engine Component
Description, Lubrication Description, New Product Information and Drive Belt System
Description. Reviewing the description and operation information will help you determine the
correct symptom diagnostic procedure when a malfunction exists. Reviewing the description and
operation information will also help you determine if the condition described by the customer is
normal operation. Refer to Symptoms - Engine Mechanical in order to identify the correct
procedure for diagnosing the system and where the procedure is located.

SYMPTOMS - ENGINE MECHANICAL

Strategy Based Diagnostics

1. Perform the Diagnostic System Check - Vehicle before using the symptom tables, if

applicable.

2. Review the system operations in order to familiarize yourself with the system functions.

Refer to Disassembled Views, Engine Component Description, Lubrication
Description, New Product Information and Drive Belt System Description.

All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform
approach for repairing all systems. The diagnostic flow may always be used in order to resolve a
system problem. The diagnostic flow is the place to start when repairs are necessary. For a
detailed explanation, refer to Strategy Based Diagnosis .

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the Engine. Refer to
Checking Aftermarket Accessories .

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado