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MerCruiser 454 MAGNUM User Manual

MerCruiser 454 MAGNUM
71 pages
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90-823224--2 796 454 CID (7.4L) / 502 CID (8.2L) - 3A-–3
ENGINE
454 CID (7.4L) / 502 CID (8.2L)

Table of Contents

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MerCruiser 454 MAGNUM Specifications

General IconGeneral
Engine TypeV8
Compression Ratio8.0:1
Displacement454 cubic inches (7.4 liters)
Bore x Stroke4.25 x 4.00 inches
Cooling SystemRaw water or Closed cooling

Summary

Torque Specifications

Gen V And Gen VI Engine Specifications

Cylinder Head Specifications

Specifications for cylinder head gasket surface flatness.

7.4L Gen VI Engine Specifications

Piston Ring Specifications

Detailed specifications for 7.4L Gen VI piston ring dimensions.

Crankshaft Specifications

Specifications for 7.4L Gen VI crankshaft journals and clearances.

Valve System Specifications

Specifications for 7.4L Gen VI valve system components.

Crankshaft

Piston and Connecting Rods

Valve Train

Intake Manifold

Intake Manifold Removal

Procedure for removing the intake manifold.

Intake Manifold Installation

Procedure for installing the intake manifold.

Lubrication System

Piston Failures

Pre-Ignition

Description and causes of abnormal fuel ignition.

Detonation

Description and causes of abnormal fuel combustion.

Rocker Arm / Push Rod

Rocker Arm / Push Rod Removal

Procedure for removing rocker arm assemblies and push rods.

Rocker Arm / Push Rod Installation

Procedure for installing rocker arm assemblies and push rods.

Hydraulic Valve Lifters

Hydraulic Valve Lifter Removal

Procedure for removing hydraulic valve lifters.

Hydraulic Valve Lifter Installation

Procedure for installing hydraulic valve lifters.

Valve Stem Oil Seal/Valve Spring

Removal - Head Installed

Procedure to remove valve stem oil seals and springs with head installed.

Installation - Head Installed

Procedure to install valve stem seals and springs with head installed.

Cylinder Head

Cylinder Head Removal

Procedure for removing the cylinder head.

Cylinder Head Installation

Procedure for installing the cylinder head.

Cylinder Head and Valve Conditioning

Valve Seat Repair

Oil Pan

Oil Pump

Torsional Damper

Crankcase Front Cover

Flywheel

Rear Main Oil Seal

Main Bearings

Main Bearings Checking Clearances

Procedure for checking main bearing clearances.

Main Bearings Replacement

Procedure for replacing main bearings.

Connecting Rod Bearings

Connecting Rod Bearings Inspection and Replacement

Inspection and replacement of connecting rod bearings.

Connecting Rod/Piston Assembly

Crankshaft

Timing Chain and Sprocket

Camshaft

Camshaft Bearings

Cylinder Block

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