GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Denali 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L and 6.2L 🢒 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

Changed Engine Specifications

A variety of specifications have been revised based on the new design LY2, LMG, LY5, LC9, LH6, L76, LY6, and L92 engines. Refer to Engine Mechanical Specifications .

Torque Values and/or Fastener Tightening Strategies
    • All fasteners and threaded holes on the LY2, LMG, LY5, LC9, LH6, L76, LY6, and L92 engines utilize metric threads.
    • Cylinder head, connecting rod, crankshaft balancer, camshaft sprocket, and main bearing cap bolts now apply a torque and angle tightening strategy.
    • 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.
    • For the LY2, LMG, LY5, LH6, and LC9 applications, the camshaft sprocket is now retained to the front of the camshaft using a single bolt design with a torque and angle tightening strategy. Refer to Fastener Tightening Specifications .
    • For the LY6, L76, and L92 applications, a camshaft position actuator is now retained to the front of the camshaft using a single bolt/valve design with a torque and angle tightening strategy. Refer to Fastener Tightening Specifications .

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 procedures have been revised based on the new design LY2, LMG, LY5, LC9, LH6, L76, LY6, and L92 engines.

Engine Mechanical Diagnostic Procedure Revisions

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 installation procedure.

A Component Comparison from the Previous Year
    • The 4.8L LR4 VIN V Gen 3 engine is replaced by the 4.8L LY2 VIN C Gen 4 engine. Refer to Engine Component Description .
    • The 5.3L LM7 VIN T, L33 VIN B, and L59 VIN Z Gen 3 engines are replaced by the 5.3L LH6 VIN M, LC9 VIN 3, LMG VIN 0, and LY5 VIN J Gen 4 engines. Refer to Engine Component Description .
    • The 6.0L LQ4 VIN U and LQ9 VIN N Gen 3 engines are replaced by the 6.0L LY6 VIN K, 6.0L L76 VIN Y, and 6.2L L92 VIN 8 Gen 4 engines. All 3 applications include the camshaft position actuator control system. The L76 application also includes cylinder deactivation active fuel management. Refer to Engine Component Description , Cylinder Deactivation (Active Fuel Management) System Description , and Camshaft Position Actuator and Solenoid Valve Description .