GM Service Manual Online
For 1990-2009 cars only

Important: Many internal engine components will develop specific wear patterns on their friction surfaces.

When disassembling the engine, internal components MUST be separated, marked and organized in a way to ensure reinstallation to original location and position.

Mark or identify the following components:

    • Piston and the piston pin
    • Piston to the specific cylinder bore
    • Piston rings to the specific cylinder bore
    • Connecting rod to the crankshaft journal
    • Connecting rod to connecting rod cap
    • Crankshaft bearings and connecting rod bearings
    • Engine camshaft and valve lifters
    • Valve lifters and valve rocker arms
    • Valve to the valve guide
    • Valve spring to cylinder head location
    • Engine block bearing cap location and direction
    • Oil pump drive and driven gears

Important: Many internal engine components will develop specific wear patterns on their friction surfaces.

When disassembling the engine, internal components MUST be separated, marked and organized in a way to ensure reinstallation to original location and position.

Mark or identify the following components:

    • Piston and the piston pin
    • Piston to the specific cylinder bore
    • Piston rings to the specific cylinder bore
    • Connecting rod to the crankshaft journal
    • Connecting rod to connecting rod cap
    • Crankshaft bearings and connecting rod bearings
    • Engine camshaft and valve lifters
    • Valve lifters and valve rocker arms
    • Valve to the valve guide
    • Valve spring to cylinder head location
    • Engine block bearing cap location and direction
    • Oil pump drive and driven gears