GM Service Manual Online
For 1990-2009 cars only

The purpose of New Product Information is to highlight or indicate important changes from the previous model year.

Changes may include one 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

The fastener tightening specifications have been revised for the fasteners of the following components:

    • Water pump pulley
    • Camshaft intermediate sprocket bolt
    • Engine coolant temperature (ECT) sensor
    • Refer to Fastener Tightening Specifications .

Changed Engine Specifications

There are no changes to the engine specifications for 2005.

New Sealants and/or Adhesives

There are no changes to the sealants and/or adhesives used for model year 2005.

Disassembly and Assembly Procedure Revisions

There are no changes to the engine disassembly or assembly procedures for 2005.

Engine Mechanical Diagnostic Procedure Revisions

There are no revisions to the engine mechanical diagnostic procedures for 2005.

New Special Tools Required

There are no new special tools required for 2005.

A Component Comparison from the Previous Year

There are 2 designs for the primary timing drive chain system.

Crankshaft Sprocket

The first design crankshaft sprocket incorporates roller timing drive chain teeth with a molded-rubber cushion ring. The second design crankshaft sprocket incorporates (IT) inverted teeth timing drive chain teeth without a molded-rubber cushion ring.

Primary Timing Drive Chain

The first design primary timing drive chain uses a roller timing drive chain. The second design primary timing drive chain uses an inverted teeth timing drive chain.

Intermediate Drive Shaft Sprockets

The first design intermediate drive shaft sprockets incorporate roller timing drive chain sprocket teeth for the primary and secondary timing drive chains. The second design intermediate drive shaft sprockets incorporate IT timing drive chain sprocket teeth for the primary timing drive chain and roller timing drive chain sprocket teeth for the secondary timing drive chains.

The second design IT timing drive system can be used in place of the first design roller timing drive system but all of the following primary timing drive components must be changed to the IT design:

    • Primary timing drive chain
    • Crankshaft sprockets
    • Left intermediate drive shaft sprocket
    • Right intermediate drive shaft sprocket