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 5.3 liter engine utilize
metric threads. |
| • | Cylinder head, connecting rod, crankshaft balancer, and main bearing
cap bolts now apply a torque angle 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. |
| • | First design engine blocks cylinder head bolts have different torque/angle
specifications using both medium length 100 mm (3.94 in) and long 155 mm
(6.1 in) M11 cylinder head bolts. Second design engine blocks use only the
medium length 100 mm (3.94 in) bolt with a common torque/angle specification. |
New Sealants and/or Adhesives
Canadian SPO Part Numbers have been added.
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. |
Changed Engine Specifications
Engine specification table contents and format have been commonized.
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
Strategy Based Diagnosis
in General Information or
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
. |
A Component Comparison from the Previous Year
| • | A new 5.3L engine has been developed and is identified as RPO LM4 VIN P. |
| • | 5.3L LM4 engines use an aluminum engine block. |
| • | Certain applications use a multi-layer steel design cylinder head
gasket. |
| • | A new electronic throttle body will be used on all applications. |
| • | The exhaust gas recirculation (ERG) system has been removed. |
| • | A new aluminum oil pan which accommodates the FWD axle |
| • | All applications use a piston with a graphite coated skirt. |
