New Product Information

NEW PRODUCT INFORMATION
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 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
^ All fasteners and threaded holes on the 4.8/5.3/6.0 liter engines utilize metric threads.
^ Cylinder head, connecting rod, crankshaft balancer, and main bearing cap bolts now 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 Fastener tightening Specifications and Thread Repair Specifications.

NEW SEALANTS AND/OR ADHESIVES
^ Threadlocking material is used on the fuel rail, intake manifold, cylinder head M8/M11, flywheel, and exhaust manifold bolt threads.
^ A pipe sealant type material is used on the engine block coolant and oil gallery plugs, oil pressure sensor threads, and engine block oil pan surface.
^ A sealant type material is used on the flange of the M8 crankshaft bearing cap side bolts.

DISASSEMBLY AND ASSEMBLY PROCEDURE REVISIONS
^ The 4.8/5.3/6.0 engine front and rear covers are adjustable and must be aligned properly with the oil pan surface and crankshaft assembly.
^ The 4.8/5.3/6.0 oil pans are a structural member of the powertrain and must be aligned properly with the rear of the engine block and transmission bell housing.
^ Crankshaft balancer installation has a specific procedure to ensure complete installation.
^ Early design water pumps will have a bolt-on drive belt pulley. Later design water pumps will have a non-removable press-on drive belt pulley.

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
^ A variety of new tools have been developed to assist in engine disassembly, assembly, and on-vehicle service.
^ Refer to Special Tools.

A COMPONENT COMPARISON FROM THE PREVIOUS YEAR
^ In the new C/K applications, the L30/L31 engines have been replaced by the new 4.8/5.3/6.0 liter LR4/LM7/LQ4 products.
^ Some of the new features include:
- L30/L31 engines have a cast aluminum lower and composite upper intake manifold assembly. The 4.8/5.3/6.0 engines have a composite one piece design.
- L30/L31 crankshafts have two bolt main caps with the thrust bearing in the number five journal (except heavy duty applications). The 4.8/5.3/6.0 crankshafts have six bolt main caps with the thrust bearing in the number three journal.
- L30/L31 ignition system includes one ignition coil, a crankshaft sensor, and a distributor assembly. The 4.8/5.3/6.0 ignition system includes a crankshaft sensor, camshaft sensor, and eight individual ignition coils.
- L30/L31 have a stamped steel oil pan. The 4.8/5.3/6.0 engines have a cast aluminum structural oil pan.