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 final torque value for the crankshaft balancer bolt has been
increased to 140 degrees. |
| • | A torque value has been added for the lower oil pan-to-upper oil
pan retaining bolts. |
| • | The torque value for the intake manifold (final pass) has been
increased to 10 N·m (89 lb in). |
| • | The torque value for the oil level sensor has been reduced to
13 N·m (115 lb in). |
Changed Engine Specifications
| • | The cylinder bore taper specification has been increased. |
| • | Machining dimensions for cylinder head height and engine block
cylinder head deck height have been added to the table. |
New Sealants and/or Adhesives
No sealant or adhesive changes from the previous year. Refer to
Sealers, Adhesives, and Lubricants
.
Disassembly and Assembly Procedure Revisions
| • | Water pump design changes do not permit removal and installation
of the drive belt pulley. |
| • | The ignition coils and bracket assembly must be removed prior
to rocker arm cover removal. |
| | The valve rocker arm covers are
now retained to the cylinder heads by four center mounted bolts. |
| • | The vapor vent pipe is now retained to the cylinder heads by two
studs (located at the front of the engine) and two bolts. |
| | 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. Refer to
Thread Repair
. |
| • | Oil pressure testing tool J 42907
has been developed to aid in oil pressure testing. Refer to
Special Tools
. |
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 covers 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 are no longer bolted 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. Refer to
Engine Component Description
. |
