Chevrolet Silverado / GMC Sierra. Service manual — part 158

4. Slide the J 38834-2 onto the J 38834-1 and into the balance shaft bore of the engine

block.

5. Install the J 38834 bearing, washer, and nut onto the J 38834-1. See Special Tools.

6. Using a wrench secure the J 38834-1 and then rotate the J 38834 nut clockwise until

the balance shaft rear bearing is removed from the engine block. See Special Tools.

7. Remove the J 26941 from the balance shaft rear bearing. See Special Tools.

2. Discard the balance shaft rear bearing.

BALANCE SHAFT CLEANING AND INSPECTION

Fig. 529: Balance Shaft Cleaning & Inspection Areas
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

1. Clean the following components in cleaning solvent:

The balance shaft (1)

The balance shaft retainer (2)

The balance shaft rear bearing

The balance shaft driven gear (4)

The balance shaft drive gear

2. Dry the following components with compressed air:

The balance shaft (1)

The balance shaft retainer (2)

The balance shaft rear bearing

The balance shaft driven gear (4)

The balance shaft drive gear

3. Inspect the balance shaft bearings for the following:

Front ball bearing for damage or wear

Front ball bearing for smoothness of operation

Rear sleeve bearing for wear, scoring, or other damage

4. Inspect the balance shaft (1) for the following:

Wear or scoring on the rear bearing journal

Damaged bolt hole threads

Damage to the balance shaft driven gear locator pin

5. Inspect the balance shaft retainer (2) for wear or damage.

6. Inspect the balance shaft retainer bolts (3) for damaged threads.

7. Inspect the driven gear (4) for the following:

Excessive wear or damage

Nicks, burrs, or scoring

8. Inspect the driven gear bolt (5) for damaged threads.

CAUTION: Refer to SAFETY GLASSES CAUTION .

IMPORTANT: The balance shaft and the balance shaft front bearing are

serviced only as an assembly. Do not remove the balance
shaft front bearing from the balance shaft.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 530: Balance Shaft Drive Gear Camshaft Timing Mark
Courtesy of GENERAL MOTORS CORP.

9. Inspect the balance shaft drive gear for the following:

Excessive wear or damage

Nicks, burrs, or scoring

BALANCE SHAFT BEARING AND/OR BUSHING INSTALLATION

Tools Required

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

J 38834 Balance Shaft Service Kit. See Special Tools.

Installation

Fig. 531: Installing Balance Shaft Rear Bearing
Courtesy of GENERAL MOTORS CORP.

1. Use the J 38834 in order to install the balance shaft rear bearing. See Special Tools.

1. Install the J 38834-3 onto the short threaded end of the J 38834-1.

2. Install the J 38834 nut, the washer, and the bearing on the long threaded end of the J

38834-1. See Special Tools.

CAUTION: Refer to SAFETY GLASSES CAUTION .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado