Mercruiser 7.4L, 8.2L V8 Marine Engine Service Manual



Covers: Mercruiser 7.4L, 8.2L V8 Gen. VI and L29 Marine Engines

  • See full model compatibility list at the bottom of this page

Pages: 1,027
File size: 12mb
Compatibility: Windows/Mac/Tablet
Notes: Bookmarked, searchable, printable. Instant digital download only.

This PDF service manual contains all the necessary instructions for any repair Mercruiser 7.4L and 8.2L V8 marine engine may require from top to bottom. This is the same professional-grade manual technicians use to diagnose and repair your marine engine in downloadable format. Whether it’s routine maintenance, such as tune-ups and fuel system service, or more extensive repairs involving engine and pump disassembly, this 1,000+ page manual provides the most accurate information to perform the job.


General Information

  • Maintenance
  • Fluids and Capacities
  • Troubleshooting

Removal and Installation

  • MCM Models – Bravo and Blackhawk Drives
  • MCM Models – Bravo and Blackhawk Drives with Driveshaft Extension
  • MIE Models – Velvet Drive Transmission
  • MIE Models – Hurth Transmission

454 cid (7.4L) / 502 cid (8.2L) Engine

  • Engine Specifications
  • Torque Specifications
  • Overview
  • Engine Mounts
  • Rocker Arm
  • Pushrod
  • Valve Adjustment
  • Hydraulic Lifters
  • Valve Stem Seal and Spring
  • Cylinder Head and Valve Conditioning
  • Dipstick
  • Oil Pump and Pan
  • Damper
  • Front Cover
  • Oil Seals
  • Flywheel
  • Main Bearings
  • Connecting Rods and Pistons
  • Crankshaft
  • Timing Chain and Sprocket
  • Camshaft and Bearings
  • Cylinder Block
  • Compression Test
  • Oil Filter Bypass Valve and Adaptor

Electrical System

  • Starting System
  • Ignition System
  • Charging System
  • Instrumentation
  • Wiring Diagram

Fuel System

  • Fuel Delivery System for Electronic Fuel Injection
  • Multi-Port Fuel Injection Descriptions and System Operation
  • Multi-Port Fuel Injection Disassembly and Reassembly
  • Fuel Injection System Troubleshooting
  • General System Diagnostics
  • Trouble Code Diagnostics – 454/502 Mag MPI & 8.2L MPI
  • Trouble Code Diagnostics – 7.4L MPI

Cooling System

  • Seawater Cooled Models
  • Closed Cooled (Fresh Water) Models

Exhaust System

  • General
  • Manifolds and Elbows
  • Risers
  • Collectors


  • Velvet Drive In-Line Transmission
  • Velvet Drive 5000A Down Angle Transmission
  • Velvet Drive 5000V V-Drive Transmission
  • Hurth V-Drive Transmission
  • Walter V-Drive Transmission
  • Drive Shaft / Propeller Shaft Models

Power Steering

Full model compatibility list:

Gen. VI Engines

Sterndrive (MCM)
MCM 454 Mag MPI 0L010029 & Up
MCM 502 Mag MPI 0L017000 & Up

Inboard (MIE) Model
MIE 454 Mag MPI Horizon 0L002200 & Up
MIE 8.2L MPI 0L002450 & Up

L-29 Engines

Sterndrive MCM 7.4L MPI 0L010003 & Up
Inboard MIE 7.4L MPI 0L002006 & Up



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