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 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 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. |
Changed Engine Specifications
Metric and English values are given for all specifications.
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. Refer to
Special Tools
. |
| • | J 45299 has been
developed to prelube new or remanufactured engines/bearings prior to engine installation.
Refer to
Engine Prelubing
. |
| • | Angle meter J 45059
has
been developed to provide technicians with a convenient method to tighten bolts that
require torque angle tightening strategy. |
A Component Comparison from the Previous Year
| • | First design applications use a piston pin that is floating fit to the
piston and press-fit to the connecting rod. Second design applications use
a piston pin that is full-floating to both the piston and the connecting rod. |
| • | The first design press-fit piston, pin and connecting rod are to
be serviced as an assembly. |
