New Product Information
New Product Information
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 - 5.3L 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.
* The camshaft sprocket is retained to the front of the camshaft using a single bolt design with a torque and angle tightening strategy.
New Sealants and/or Adhesives
Sealers and adhesives, as required, are identified within the specific service procedures. Refer to Sealers, Adhesives, and Lubricants (Specifications) .
Disassembly and Assembly Procedure Revisions
A new design timing chain tensioner replaces the timing chain dampener. Refer to Timing Chain and Sprockets Installation (Overhaul) .
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 (Initial Inspection and Diagnostic Overview) .
New Special Tools Required
Timing belt tensioner retaining pin EN 46330 is used to retain the timing chain tensioner during the installation procedure.
A Component Comparison from the Previous Year
* 2008 LS4 - 5.3L engines contain the long nose camshaft, single-bolt cam sprocket, timing chain tensioner, and new front cover.
* Some applications may use a second design camshaft retainer plate and bolts. Refer to Camshaft Installation (Overhaul) .
* A new design timing chain tensioner replaces the timing chain dampener.