Chevrolet Silverado / GMC Sierra. Service manual — part 2127

Fig. 53: View Of J 33049 Camshaft Bearing Service Kit Components
Courtesy of GENERAL MOTORS CORP.

The tool consists of a guide cone (1), driving washers (2 or 3), expander bearing drivers (4-
8), driver bars (9 or 10), expander jaws (11), expander sleeve (12), expander cone (13),
expander shaft (14), and expander assembly (15).

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

Expander bearing driver number 1 inside diameter is 28.575-37.465 mm (1.125-1.475 in)
and is used with the expander assembly and the small washer.

Expander bearing driver number 2 inside diameter is 37.465-43.18 mm (1.475-1.7 in) and is
used with number 1 expanding driver and the small washer.

Expander bearing driver number 3 inside diameter is 43.18-48.895 mm (1.7-1.925 in) and is
used with number 2 expanding driver and the large washer.

Expander bearing driver number 4 inside diameter is 48.895-54.61 mm (1.925-2.15 in) and
is used with number 3 expanding driver and the large washer.

Expander bearing driver number 5 inside diameter is 54.61-60.325 mm (2.150-2.375 in)
and is used with number 4 expanding driver and the large washer.

Expander bearing driver number 6 inside diameter is 60.325-68.326 mm (2.375-2.69 in)
and is used with number 5 expanding driver and the large washer.

Tool Assembly and Operation

1. Select the proper expanding driver and washer from the expanding driver and washer

information.

2. Place the expanding driver onto the expander assembly.

3. Ensure the separation lines between the segments of the expanding driver align with the

separation lines of the expander assembly.

4. With the small end of the cone facing the driver assembly, place the guide cone over the

driving bar.

5. Place the driving washer over the threaded portion of the expander assembly.

6. Screw the expander assembly, with driving washer, onto the driving bar.

For removal of the inner bearings, it may be necessary to install the driver bar extension.

IMPORTANT: To install or remove the expanding driver, always push on or

pull from the ends.
Pressure on the outside diameter may cause a bind against
the rubber expanding sleeve.

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. 54: Driving Bearing Out Of Or Into Engine Block
Courtesy of GENERAL MOTORS CORP.

7. Insert the tool into an inner camshaft bearing and tighten until snug.

Operate the tool from the front or rear of the engine block.

On some engine blocks, the nut on the expander assembly is inaccessible, except from either
end. In this case, you must use a socket and extension to enlarge and reduce the expander
assembly.

8. Slide the nylon cone (2) into the front or rear camshaft bearing. This will properly align the

tool.

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

9. Drive the bearing out of or into the engine block.

10. Repeat the procedure for the additional inner bearings.

Fig. 55: Driving Bearing Out Of Or Into Engine Block
Courtesy of GENERAL MOTORS CORP.

11. For the 2 end bearings, front and rear, remove the nylon cone and driver bar extension.

12. Drive the bearings out of or into the engine block.

CAMSHAFT AND BEARINGS CLEANING AND INSPECTION (RPO LY2/L
LY2/LH6/LMG/LY5/LC9)

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