The purpose of New Product Information is to highlight, or indicate, important product changes from the previous model year.
Changes may include 1 or more of the following items:
| • | Torque values and/or fastener tightening strategies |
| • | Changed engine specifications |
| • | New sealants and/or adhesives |
| • | Disassembly and assembly procedure revisions |
| • | Engine mechanical diagnostic procedure revisions |
| • | New special tools required |
| • | A component comparison from the previous year |
Torque Values and/or Fastener Tightening Strategies
| • | All fasteners and threaded holes on the LS4 engine utilize metric threads. |
| • | Certain fasteners should not be used again. Bolts, studs, or other fasteners that must be replaced, will be called out in the specific service procedure. |
New Sealants and/or Adhesives
Sealers and adhesives, as required, are identified within the specific service procedures. Refer to
Adhesives, Fluids, Lubricants, and Sealers
.
Disassembly and Assembly Procedure Revisions
A variety of new procedures have been added for the LS4 application.
Engine Mechanical Diagnostic Procedure Revisions
All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system condition. The diagnostic flow is the place to start
when repairs are necessary. For a detailed explanation, refer to
Diagnostic Starting Point - Engine Mechanical
.
New Special Tools Required
The small block V8 LS4 application requires the following tools:
| • | EN 46330
Timing Belt Tensioner Retaining Pin |
| • | EN-46999
Active Fuel Management Tester |
| • | EN-46999-1
Active Fuel Management Tester Air Adapter |
| • | EN-46999-5
Active Fuel Management Tester Harness - Small Block V8 |
| • | EN-47988
Serpentine Belt Tensioner Unloader |
| • | J 41476
Front and Rear Cover Alignment Tool |
| • | J 41478
Crankshaft Front Oil Seal Installer |
| • | J 41479
Crankshaft Rear Oil Seal Installer |
| • | J 41479-2A
Crankshaft Rear Oil Seal Installation Guide |
| • | J 41480
Front and Rear Cover Alignment |
| • | J 41558
Crankshaft Sprocket Remover |
| • | J 41665
Crankshaft Balancer and Sprocket Installer |
| • | J 41818
Crankshaft Bearing Cap Remover |
Refer to
Special Tools
.
A Component Comparison from the Previous Year
| • | The 5.3L RPO LS4 V8 engine is optional for the 2008 model year. |
| • | The LS4 V8 engine includes active fuel management. |
| • | Second design engines will use a rivet-type plug replacing the coolant air bleed covers located at the top rear of each cylinder head. To properly repair a leaking plug, remove cylinder head from the engine, remove the plug from the cylinder head
and install first design coolant air bleed cover and bolt. |
