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. |
Changed Engine Specifications
Metric and English values are given for all specifications.
New Sealants and/or Adhesives
| • | Threadlock material is used on the fuel rail, intake manifold,
cylinder head M8, and exhaust manifold bolt threads. |
| • | A pipe sealant type material is used on the engine block coolant
and oil gallery plugs, oil pressure sensor threads, and engine block oil pan
surface. |
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
Base Engine Misfire, Valve Train, and other diagnostic information is
now provided in table form. Potential or probable causes are supplied for
each specific concern.
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 |
