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 reused. Bolts, studs, or other
fasteners that must be replaced will be called out in the specific service
procedure. |
| • | A second design connecting rod bolt may be used. The proper fastener
tightening value MUST be used with the correct bolt. |
Changed Engine Specifications
Metric and English values are given for all specifications.
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 problem. 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. |
| • | A new thread repair strategy and service kit have been developed
for the aluminum products |
| • | J 42078 is
not required for installation of the second design seal and shim assembly. |
A Component Comparison from the Previous Year
| • | The engine coolant air bleed system has been changed to a two
point system with the coolant air bleed pipe mounted to the front top area
of both cylinder heads. |
| • | A second design valve stem oil seal and shim assembly may be used
on later engines. |
| • | All 2002 applications have a second design piston with a graphite
coated skirt. |
