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
| • | The torque value for the oil level indicator tube bolt has been
increased to 25 N·m (18 lb ft). |
| • | The torque value for the oil level sensor has been reduced to
20 N·m (15 lb ft). |
| • | The torque value for the intake manifold (final pass) has been
increased to 10 N·m (89 lb in). |
| • | Torque values for the engine wire harness clip bolt and engine
ground strap bolt have been added. |
| • | Torque values for the vapor vent pipe studs have been added. |
| • | The new service thread repair tools and service procedures are
identified. |
Changed Engine Specifications
The cylinder bore taper specification has been increased.
For changes to component specifications, refer to
Engine Mechanical Specifications
.
New Sealants and/or Adhesives
| • | No sealant or adhesive changes from the previous year. |
Disassembly and Assembly Procedure Revisions
| • | Water pump design changes do not permit removal and installation
of the drive belt pulley. |
| • | The vapor vent pipe is now retained by two bolts and two studs. |
| | The two vapor vent pipe studs are mounted to the front of the
engine. The right front stud provides a mounting point for the Positive Crankcase
Ventilation (PCV) system. |
| • | 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
| • | The proper thread repair procedures for aluminum cylinder blocks
and cylinder heads have been added. |
| • | Oil pressure testing tool J 42907
has been developed to aid in on-vehicle oil pressure testing. |
A Component Comparison from the Previous Year
| • | The water pump drive belt pulley is now pressed onto the pump
shaft and is not serviceable separately. |
| • | Aluminum carrier/silicone bead type gaskets now provide sealing
between the water pump and the engine block surfaces. |
| | Do not substitute
the earlier design paper gasket for the aluminum carrier type. Water pump
pulley and accessory drive belt position will be affected. |
| • | The valve rocker arm cover and cylinder head designs have changed.
The rocker covers are retained to the cylinder heads by four center mounted
rocker cover bolts. |
| • | The ignition coils no longer bolt directly to the valve rocker
arm covers. The coils are mounted to a coil mounting bracket and the bracket
is retained to the cover by bolts. |
