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 4.8, 5.3, and 6.0 liter
engines 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. |
| • | A second design connecting rod bolt may be used. The proper fastener
tightening value must be used with the correct bolt. |
Changed Engine Specifications
| • | The 6.0 L applications have a new design camshaft. |
| • | Crankshaft bearing clearances are revised. |
New Sealants and/or Adhesives
| • | Threadlocking material is used on the fuel rail, ignition coil bracket
bolts, intake manifold, cylinder head M8/M11, flywheel, 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. |
| • | A sealant type material is used on the flange of the M8 crankshaft bearing
cap side bolts. |
Disassembly and Assembly Procedure Revisions
| • | For certain applications, a spacer plate has been added between the flywheel
and rear of the crankshaft. It is necessary to remove the spacer plate prior
to removal and installation of the crankshaft rear oil seal. |
| • | All applications use a cast aluminum cylinder head design. |
| • | 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
in 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 42078 is not required
for installation of the second design valve stem oil seal and shim assembly. |
A Component Comparison from the Previous Year
| • | In manual transmission applications, a new design transmission pilot
bearing is used. |
| • | All cylinder heads are of a cast aluminum design. |
| • | All crankshafts will have a short rear flange (at the crankshaft rear
oil seal area). Certain applications (4.8L manual transmission and all 6.0L)
require a spacer between the rear of the crankshaft and the flywheel for proper
flywheel positioning. Longer bolts are required in applications using the spacer. |
| • | The oil fill tube has increased in length. |
| • | The current design four point engine coolant air bleed pipe will be used
on early engines. A second design two point pipe (mounted to the front of each cylinder
head), will be used on later engines. |
| • | All 6.0L applications have a new design camshaft. |
| • | Engine sight shield design has changed. The 4.8L and 5.3L applications
will use a new one piece design. The 6.0L applications will use a new three piece
shield. |
| • | A second design valve stem oil seal and shim assembly may be used on
later engines. |
