Chevrolet Silverado / GMC Sierra. Service manual — part 597

15. Install the water pump to water pump housing bolts.

Tighten: Tighten the water pump to water pump housing bolts to 21 N.m (15 lb ft).

16. Install a new O-ring to the water pump.

EXHAUST GAS RECIRCULATION COOLER CLEANING AND INSPECTION

Fig. 72: EGR Cooling Hoses
Courtesy of GENERAL MOTORS CORP.

1. Remove the exhaust gas recirculation (EGR) cooling hoses.

2. Clean and inspect the EGR gasket surfaces.

3. Clean and inspect the EGR and cooler.

4. Replace the EGR or cooler if damaged.

THREAD REPAIR

General purpose thread repair kits are available commercially.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

Fig. 73: Drilling & Tapping Damaged Threads
Courtesy of GENERAL MOTORS CORP.

1. Determine the size, the pitch, and the depth of the damaged thread.

CAUTION: Refer to SAFETY GLASSES CAUTION .

IMPORTANT: Refer to the thread repair kit manufacturer's instructions

regarding the size of the drill and which tap to use.
Always avoid any buildup of chips. Back out the tap every
few turns and remove the chips.

2008 Chevrolet Silverado 1500

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

2. Adjust the stop collars on the cutting tool as needed. Tap the stop collars to the required

depth.

3. Drill out the damaged thread.

4. Remove the chips.

5. Apply clean engine oil to the top thread.

6. Use the tap in order to cut new thread.

7. Clean the thread.

Fig. 74: Installing Thread Insert
Courtesy of GENERAL MOTORS CORP.

8. Screw the thread insert onto the mandrel of the thread insert installer. Engage the tang of the

2008 Chevrolet Silverado 1500

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

thread insert onto the end of the mandrel.

9. Lubricate the thread insert with clean engine oil - except when installing in aluminum - and

install the thread insert.

10. If the tang of the thread insert does not break off when backing out the thread insert

installer, break off the tang using a drift punch.

FUEL LINE TORQUING

IMPORTANT: The thread insert should be flush to 1 turn below the surface.

2008 Chevrolet Silverado 1500

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