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
| • | A non-torque angle strategy has been added for cylinder head bolts. |
| | In an on-vehicle situation where a torque angle meter may not fit into
the vehicle packaging, a three step tightening process may be used with a
torque wrench. |
| • | Cylinder head and connecting rod bolts 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. |
| • | Refer to Engine Mechanical Specifications (5.7L)
. |
Changed Engine Specifications
Engine specifications remain the same as the 1997 products.
New Sealants and/or Adhesives
| • | Additional applications have been added to the table including: |
| - | Crankshaft keyway adhesive |
| - | Flywheel bolt threads sealant |
| - | Exhaust manifold bolt threadlock |
| - | Engine block oil gallery plug threads sealant |
Disassembly and Assembly Procedure Revisions
| • | A new design Teflon® rear crankshaft oil seal installation
procedure |
| • | A new design valve stem oil seal for exhaust valves only. |
| • | Engine block plug information has been enhanced to include all
oil gallery and coolant plugs. |
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. |
| • | Refer to Base Engine Misfire Diagnosis
. |
New Special Tools Required
| • | Tool J 35621-A
is a revision of J-35621 and services ALL applications. |
