For 1990-2009 cars only

Makes 🢒 Buick 🢒 2008 🢒 Allure 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 New Product Information

New Product Information for Buick Allure 2008

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 47699 Flywheel Holding Tool

•	EN-47971 Oil Pressure Gage Adapter

•	EN-47988 Serpentine Belt Tensioner Unloader

•	J-21867-16 Oil Pressure Adapter

•	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 41556 Connecting Rod Guide

•	J 41558 Crankshaft Sprocket Remover

•	J 41665 Crankshaft Balancer and Sprocket Installer

•	J 41816-A Crankshaft Balancer Remover

•	J 41816-2 Crankshaft End Protector

•	J 41818 Crankshaft Bearing Cap Remover

•	J 42385-100 Head/Main Bolt Thread Repair Kit

•	J 42385-200 Common Thread Repair Kit

•	J 42385-300 Fixtures and Hardware Kit

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.

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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.