New Product Information for Generic Unit Repair 2002
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. |
