OT178500 / 90-881980R1 Mercury 115 FourStroke EFI Service Manual Print Out

The OT178500 / 90-881980R1 Mercury 115 FourStroke EFI Service Manual is a factory repair guide for Mercury’s 115 HP four-stroke outboards with electronic fuel injection. It covers models starting from model year 2001, beginning serial number 0T178500.

Inside, you’ll find:

• Detailed instructions for disassembly, inspection, repair, and reassembly

• Torque values, system schematics, wiring diagrams, and specifications

• Sections on powerhead, fuel injection, lower unit, steering, controls, trim— the full spectrum of service work

• Photographs, diagrams, and charts to guide you step by step

This manual helps technicians, restorers, and do-it-yourselfers maintain or rebuild the engine to factory standards. Use it to verify clearances, wiring, fuel system layout, timing, and all critical data. It helps prevent guesswork and errors, leading to more reliable engine work.

If you work on 115 HP Mercury FourStroke EFI motors, this service manual is a foundational reference you don’t want to merge or skip.

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