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