New Product Information. Buick Century 2003

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2003 🢒 Century 🢒 Engine 🢒 Engine Mechanical - 3.1L 🢒 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 one or more of the following items:

•	A component comparison from the previous year

•	Fastener changes

•	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

No new components for 2003.

No fastener changes from 2003.

•	Crankshaft Position Sensor Wiring Bracket Bolt was 40 N·m (30 lb ft) is now 27 N·m (20 lb ft).

•	Spark Plug - New Cylinder Head was 27 N·m (20 lb ft) is now 20 N·m (15 lb ft).

•	Lower Intake Manifold Bolt Strategy is now First Pass 7 N·m (62 lb in); Final Pass 13 N·m (115 lb in).

A new Engine Mechanical Specifications chart has been implemented into the 2003 service manual.

No new sealants and/or adhesives for 2003.

•	Oil Level Indicator and Tube Removal and Installation procedure has been revised.

•	Exhaust Manifold - Left/Right Removal and Installation procedure has been revised.

•	Water Outlet Removal and Installation is now Water Outlet and Thermostat Removal and Installation.

•	Valve Rocker Arm Cover Removal and Installation - Left/Right procedure has been revised.

•	Camshaft and Bearings Cleaning and Inspection procedure has been revised.

•	Intake Manifold Cleaning and Inspection - Lower procedure has been revised.

•	Valve Rocker Arm and Push Rod Installation procedure has been revised.

•	Engine Prelubing procedure has been added.

•	Coolant in Combustion Chamber Diagnostic Procedure has been added.

•	Coolant in Engine Oil Diagnostic Procedure has been added.

J 45299 Engine Preluber has been added.