MECURY MERCRUISER GM V8 7.4L / 8.2L #23 SERVICE MANUAL 

MARINE ENGINES 

GM V8 454 cid (7.4L) / 502 cid (8.2L) 

Models Covered in This Manual 
Gen. VI Engines 
Sterndrive (MCM) Model Serial Number 
MCM 454 Mag MPI 0L010029 & Up 
MCM 502 Mag MPI 0L017000 & Up 
Inboard (MIE) Model Serial Number 
MIE 454 Mag MPI Horizon 0L002200 & Up 
MIE 8.2L MPI 0L002450 & Up 
L-29 Engines 
Sterndrive (MCM) Model Serial Number 
MCM 7.4L MPI 0L010003 & Up 
Inboard (MIE) Model Serial Number 
MIE 7.4L MPI 0L002006 & Up 


Service Manual Outline 
Section 1 - Important Information 
A - General Information 
B - Maintenance 
C - Troubleshooting 
Section 2 - Removal and Installation 
A - MCM Models - Bravo and Blackhawk Drives 
B - MCM Models - Bravo and Blackhawk Drives with 
Driveshaft Extension 
C - MIE Models - Velvet Drive Transmission 
D - MIE Models - Hurth Transmission 
Section 3 - Engine 
A - 454 cid (7.4L) / 502 cid (8.2L) 
Section 4 - Electrical System 
A - Starting System 
B - Ignition System 
C - Charging System 
D - Instrumentation 
E - Wiring Diagrams 
Section 5 - Fuel System 
A - Fuel Delivery System for Electronic Fuel Injection 
B - Multi-Port Fuel Injection Descriptions and System Operation 
C - Multi-Port Fuel Injection Disassembly and Reassembly 
D - Fuel Injection System Troubleshooting 
E - General System Diagnostics 
F - Trouble Code Diagnostics - 454/502 Mag MPI & 8.2L MPI 
G - Trouble Code Diagnostics - 7.4L MPI 
Section 6 - Cooling System 
A - Seawater Cooled Models 
B - Closed Cooled (Fresh Water) Models 
Section 7 - Exhaust System 
A - General 
B - Manifolds and Elbows 
C - Risers 
D - Collectors 
Section 8 - Drives 
A - Velvet Drive In-Line Transmission 
B - Velvet Drive 5000A Down Angle Transmission 
C - Velvet Drive 5000V V-Drive Transmission 
D - Hurth V-Drive Transmission 
E - Walter V-Drive Transmission 
F - Drive Shaft / Propeller Shaft Models 
Section 9 - Power Steering 
A - Pump Please email at ireneroberson9@gmail.com and we will provide you with the any manual you need right away. We are constantly updating the site with new stock but we have much more than available in the website.