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:
| • | Torque values and/or fastener tightening strategies |
| • | Changed engine specifications |
| • | New sealants and/or adhesives |
| • | Disassembly and assembly procedure revisions |
| • | Engine mechanical diagnostic procedure revisons |
| • | New special tools required |
| • | A component comparison from the previous year |
Torque Values and/or Fastener Tightening Strategies
| • | Cylinder head bolt torque has been changed. Refer to Fastener Tightening Specifications
. |
| • | Crankshaft bearing cap bolt torque has been changed. Refer to Fastener Tightening Specifications
. |
| • | Valve lifter guide plate torque has been changed. Refer to Fastener Tightening Specifications
. |
| • | Valve rocker arm cover torque has been changed. Refer to Fastener Tightening Specifications
. |
| • | Turbocharger oil feed hose fitting torque has been changed. Refer
to Fastener Tightening Specifications
. |
Changed Engine Specifciations
| • | Piston bore clearance and ring gaps have been changed. Refer to
Engine Mechanical Specifications. |
| • | Case, camshaft, camshaft journal, and camshaft bearing diameters
have been changed. Refer to Engine Mechanical Specifications. |
Disassembly and Assembly Procedure Revisions
| • | Cylinder head bolt torquing sequence has been changed. |
| | Refer to Cylinder Head Installation
. |
| • | Crankshaft bearing cap bolt torquing sequence has been changed.
Refer to Crankshaft and Bearings Installation. |
A Component Comparison from the Previous Year
| • | The number one compression (fire) ring material has been changed
to moly carbide to increase durability. |
| • | The intermediate (2, 3, and 4) crankshaft bearing cap outer bolts
have been changed to 10mm. The outer (1 and 5) crankshaft bearing cap outer
bolts and all of the crankshaft bearing cap inner bolts remain 12mm. |
| • | The oil level indicator has been changed to commonize it with
other GM products. |
