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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.
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.
New Sealants and/or Adhesives
Canadian SPO part numbers have been added. Refer to Sealers, Adhesives, and Lubricants .
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 condition. 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
Angle Meter J 45059 has been developed to provide technicians with a convenient method to tighten bolts that
require the torque angle tightening strategy. See Special Tools and Equipment .
A Component Comparison from the Previous Year
A timing chain guide has been added to the valve train system. The nylon chain guide is retained to the
front of the engine block by two bolts.
The positive crankcase ventilation (PCV) system is now incorporated into the engine valley cover for
both LS1 and LS6 applications.
The first design piston, pin, and connecting rod are to be serviced as an assembly.
First design applications use a piston pin that is floating fit to piston and press fit to the connecting rod.
Second design applications use a piston pin that is full-floating to both the piston and connecting rod.
LUBRICATION DESCRIPTION
Lubrication Flow Schematic
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