392074 Service Manual – OMC 70HP & 75HP Outboards

The OMC 70HP 75HP Service Manual (part number 392074) is the official factory reference for Johnson and Evinrude outboards in the 70HP and 75HP range. Written by Outboard Marine Corporation’s original engineering team, it provides precise maintenance and repair procedures for these models.

This manual covers all major systems in detail:

• Powerhead – Disassembly, inspection, and reassembly

• Fuel System – Carburetor servicing, adjustments, and troubleshooting

• Ignition System – Testing, timing, and component replacement

• Lower Unit – Gearcase service, seal replacement, and assembly diagrams

• Cooling & Exhaust – Water pump servicing, exhaust system checks, and repairs

• Electrical System – Wiring diagrams, starter servicing, and charging system maintenance

• Power Trim & Tilt – Hydraulic servicing and adjustment steps

Clear exploded diagrams help you identify parts and understand the order of assembly. Step-by-step instructions walk you from fault diagnosis to complete repair, with torque specifications and service data tables for quick reference.

Built for workshop use, this durable manual is ideal for both professional marine technicians and hands-on boat owners. With it, you can restore your engine’s performance, extend its lifespan, and maintain reliability for years to come.

Arizona Outboard Dismantlers supplies only genuine factory manuals like the OMC 70HP 75HP Service Manual to help you protect your investment and keep your boating seasons trouble-free.