Engine Mechanical - 4.3L: Overhaul Chevrolet Silverado 1500 HD

Service Prior to Assembly

1. Dirt will cause premature wear of the rebuilt engine. Clean all the components.
2. Use the proper tools to measure the components when checking for excessive wear. Components not within the manufacturer's specification must be repaired or replaced.
3. When the components are re-installed into an engine, return the components to the original location, position, and direction.
4. During assembly, lubricate all the moving parts with clean engine oil, unless otherwise specified. The engine oil will provide the initial lubrication when the engine is first started.

Piston and Connecting Rod Assemblies

The cast aluminum pistons use two compression rings and one oil control assembly. The piston is a low friction, lightweight design with a flat top and barrel shaped skirt. The piston pins are offset 0.9 mm (0.0354 in) toward the major thrust side (right side) to reduce piston slap as the connecting rod travels from one side of the piston to the other side after a stroke. The piston pins have a floating fit in the piston and are retained by a press fit in the connecting rod. The connecting rods are forged steel. The connecting rods are machined with the rod cap installed for proper clearances and alignments.

Disassembly and Assembly Procedure Revisions

1. Intake manifold disassembly and assembly has changed due to the deletion of the EGR and new Central (MFI) fuel system.
2. Measuring Connecting Rod Bearing Clearances has changed due to a tool revision.
3. Engine Preluber procedure has been added to this section.
4. Discard all used gaskets, seals or O-ring seals unless otherwise indicated.
5. MFI fuel system procedure.

Assembling Components

1. Assemble components using only the sealant (or equivalent) that is specified in the service procedure.
2. Sealing surfaces must be clean and free of debris or oil.
3. Specific components such as crankshaft oil seals or valve stem oil seals may require lubrication during assembly.
4. Components requiring lubrication will be identified in the service procedure.
5. Apply only the amount of sealant specified in the service procedure to a component.
6. Do not allow the sealant to enter into any blind threaded holes, as the sealant may prevent the fastener from clamping properly or cause component damage when tightened. IMPORTANT: Do not overtighten the fasteners.
7. Tighten the fasteners to the proper specifications.