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AMC 4.2L 258 CID User Manual

AMC 4.2L 258 CID
66 pages
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Table of Contents

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AMC 4.2L 258 CID Specifications

General IconGeneral
Engine TypeInline-6
Compression Ratio8.0:1
Fuel TypeGasoline
ValvetrainOHV (Overhead Valve)
Displacement4.2L
Bore3.75 in (95.25 mm)
Cooling SystemLiquid
Fuel SystemCarburetor (typically Carter BBD or Motorcraft 2100)
TorqueVaries by year: typically 210-220 lb-ft

Summary

GENERAL DESCRIPTION

ENGINE IDENTIFICATION

Information on identifying engine build date and codes.

BUILD DATE CODE

Details on build date code and letter code explanation.

TORQUE SPECIFICATIONS

ENGINE COMPONENT TORQUE

Table of torque specifications for various engine components.

ENGINE SPECIFICATIONS - 4.0L

ENGINE SPECIFICATIONS - 4.2L

GENERAL SPECIFICATIONS

General engine specifications for the 4.2L engine.

CYLINDER HEAD DISASSEMBLY

CYLINDER HEAD REMOVAL

Procedure for removing the cylinder head, including rocker arms and push rods.

CYLINDER BLOCK DISASSEMBLY

OIL PAN & OIL PUMP REMOVAL

Procedures for removing the oil pan and oil pump assembly.

CONNECTING ROD & CRANKSHAFT REMOVAL

Procedures for removing connecting rods, pistons, and crankshaft.

CYLINDER BORE MEASUREMENT & RESURFACING

Procedures for measuring and honing cylinder bores.

PISTON FITTING

Methods for fitting pistons to cylinder bores.

PISTON RING INSTALLATION

Procedure for installing piston rings on pistons.

CRANKSHAFT INSTALLATION & END PLAY MEASUREMENT

Procedures for installing crankshaft and measuring end play.

MAIN BEARING PROCEDURES

Description of main bearings and measuring clearance.

REAR MAIN BEARING OIL SEAL INSTALLATION

Procedure for installing the rear main bearing oil seal.

CONNECTING ROD INSTALLATION & BEARING INSPECTION

Procedures for installing connecting rods and inspecting bearings.

CYLINDER HEAD ASSEMBLY

CYLINDER HEAD INSTALLATION

Procedure for installing the cylinder head and bolts.

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