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 L98 engines utilize metric threads. |
| • | Certain fasteners should not be used again. Bolts, studs, or other fasteners that must be replaced, are called out in the specific service procedure. |
| • | Some applications may use a second design camshaft retainer plate and bolts. Refer to
Camshaft Installation
. |
New Sealants and/or Adhesives
Disassembly and Assembly Procedure Revisions
The timing chain and sprocket installation procedure has been revised. Refer to
Timing Chain and Sprockets Installation
.
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
| • | Timing belt tensioner retaining pin
EN 46330
is used to retain the timing chain tensioner during the chain and sprocket installation procedure. |
| • | Oil pressure gage adapter
EN-47971
is required for oil pressure testing on VE applications. The new design oil filter, with internal bypass valve, has a larger diameter oil filter fitting. |
A Component Comparison from the Previous Year
| • | The 6.0 liter RPO L76 engine has been replaced by the 6.0 liter RPO L98 engine. |
| • | The 6.0 liter L98 engines do not contain the GM Active Fuel Management™ hardware. |
| • | The camshaft sprocket is now retained to the front of the camshaft using a single bolt design with a torque and angle tightening strategy. |
| • | A new design timing chain tensioner replaces the timing chain dampener. |
| • | For the VE applications, the oil filter bypass valve is now internal to the new design oil filter. |
| • | For VE applications, the oil pressure relief valve has been removed from the oil pan assembly. |
