Chevrolet Silverado / GMC Sierra. Manual — part 181
Fig. 603: 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 - 4.3L - 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. 604: 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 - 4.3L - 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.
SERVICE PRIOR TO ASSEMBLY
Dirt will cause premature wear of the rebuilt engine. Clean all the components.
Use the proper tools to measure the components when checking for excessive wear.
Components not within the manufacturer's specification must be repaired or replaced.
When the components are re-installed into an engine, return the components to the original
location, position, and direction.
During assembly, lubricate all the moving parts with clean engine oil, unless otherwise
specified. The engine oil will provide the initial lubrication when the engine is first started.
ENGINE BLOCK PLUG INSTALLATION
Special Tools
J 41712 Oil Pressure Switch Socket. See Special Tools.
Installation
IMPORTANT: The thread insert should be flush to 1 turn below the surface.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 605: Locating Oil Filter Bypass Valve
Courtesy of GENERAL MOTORS CORP.
1. Install a NEW oil filter bypass valve.
1. Install the oil filter bypass valve into the oil gallery bore until slightly below flush with
the surface of the engine block.
2. Using a pointed punch, stake the engine block area around the oil filter bypass valve.
CAUTION: Refer to Safety Glasses Caution .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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