New Product Information for Chevrolet Express 1999
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
| • | Cylinder head bolts, crankshaft bearing cap bolts, and connecting
rod bolts apply a torque angle strategy. |
| | 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. |
| • | Certain fasteners should not be reused. Bolts, studs, or other
fasteners that must be replaced will be called out in the specific service
procedure. |
Changed Engine Specifications
Engine specifications remain the same as the 1998 products.
Disassembly and Assembly Procedure Revisions and Additions
| • | A new design Teflon® crankshaft rear oil seal installation
procedure |
| • | Engine block plug information has been enhanced to include the
engine oil pressure gauge sensor and the engine oil pressure gauge sensor
fitting. |
Engine Mechanical Diagnostic Procedure Revisions
| • | Valve Train diagnostic information is now provided in table form.
Potential or probable causes are supplied for each specific concern. |
| • | Engine Noise diagnostic information is now provided in table form.
Potential or probable causes are supplied for each specific concern. |
New Special Tools Required
| • | Tool J 35621-B
is a revision
of J 35621-A and services ALL applications. |
| • | Tool J 41712
has been added
for the removal and installation of the oil pressure gauge sensor. |
