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 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 LS1 engine utilize metric
threads. |
| • | Cylinder head, connecting rod, crankshaft balancer, and main bearing
cap bolts now apply a torque 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. |
New Sealants and/or Adhesives
Canadian SPO part numbers have been added. Refer to
Sealers, Adhesives, and Lubricants
.
Disassembly and Assembly Procedure Revisions
| • | The piston, pin, and connecting rod are to be serviced as an assembly. |
| • | Newer design pistons have a graphite coated piston skirt. The
coated skirt outside diameter (OD) may be slightly larger than the
cylinder bore inside diameter (ID) and the piston assembly may have
a slight interference fit to the cylinder bore during initial installation. |
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
| • | A variety of new tools have been developed to assist in engine
disassembly, assembly and on-vehicle service. |
| • | J 45299 has
been developed to prelube new or remanufactured engines/bearings prior to
engine installation. Refer to
Engine Prelubing
. |
