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 6.0 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 reused. Bolts, studs, or other fasteners
that must be replaced will be called out in the specific service procedure. |
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 Strategy
Based Diagnosis in General Information or
Diagnostic Starting Point - Engine Mechanical
.
New Special Tools Required
Angle Meter J 45059
has
been developed to provide technicians with a convenient method to tighten bolts that
require the torque angle tightening strategy.
A Component Comparison from the Previous Year
| • | Exhaust gas recirculation (EGR) system has been deleted on all applications. |
| • | All 2004 applications use a piston with a graphite coated skirt. |
| • | The positive crankcase ventilation (PCV) valve is a non-serviceable
fitting in the left rocker cover. |
| • | The fuel rails for all engines are returnless fuel systems. The fuel
pressure regulator is now a part of the fuel pump module. |
