Chevrolet Silverado / GMC Sierra. Service manual — part 2153

Leakage at the water pump vent hole

A stain around the vent hole is acceptable. If leakage, dripping, occurs with the engine
running and the cooling system pressurized, replace the water pump.

Wear or damage in the belt tracking area of the pulley

THREAD REPAIR

Tools Required

J 42385-100 Head/Main Bolt Thread Repair Kit. See Special Tools .

J 42385-200 Common Thread Repair Kit. See Special Tools .

J 42385-300 Fixtures and Hardware Kit. See Special Tools .

General Thread Repair

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. 135: View Of Bushing Type Insert & Base Material
Courtesy of GENERAL MOTORS CORP.

The thread repair process involves a solid, thin walled, self-locking, carbon steel, bushing type
insert (1). During the bushing installation process, the driver tool expands the bottom external
threads of the insert into the base material (2). This action mechanically locks the insert in place.
Also, when installed to the proper depth, the flange of the insert will be seated against the
counterbore of the repaired hole.

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. 136: Drilling & Tapping Threads
Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Safety Glasses Caution .

IMPORTANT:

The use of a cutting type fluid GM P/N 1052864
(Canadian P/N 992881), WD 40®, or equivalent, is
recommended when performing the drilling,
counterboring, and tapping procedures.

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

1. Drill out the threads of the damaged hole (1).

M6 inserts require a minimum drill depth of 15 mm (0.59 in).

M8 inserts require a minimum drill depth of 20 mm (0.79 in).

M10 inserts require a minimum drill depth of 23.5 mm (0.93 in).

2. Using compressed air, clean out any chips.

Driver oil MUST be used on the installer driver tool.

The tool kits are designed for use with either a suitable
tap wrench or drill motor.

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