Johnson 50HP, 60HP, 75HP, 80HP, 90HP, 100HP, 115HP, 125HP Evinrude Outboard Motor Service Manual (1958–1972)

This service manual covers selected 1958–1972 Johnson and Evinrude 50–125 HP outboards with three-cylinder and V4 two-stroke engines. The appendix lists model numbers for both brands so you can match your outboard to the applicable service sections.

PDF Search, Wiring Diagrams, and Page Count

Search and diagram legibility. The scan is partially searchable. OCR errors can affect text searches, and some drawings are image-only. The PDF has no bookmarks. Zoom in to read small wire-color, wire-gauge, and terminal labels.

The download is one printable English PDF with 526 pages, including one cover page, seven contents pages, 488 chapter pages, and a 30-page appendix. The appendix begins with torque specifications on printed page A-3.

Powerhead, Fuel, Ignition, and Gearcase Service

These are selected service topics. The manual also covers propeller hub service and recovery of submerged outboards.

• Tune-up and diagnosis cover compression checks, spark plug inspection, carburetor adjustment, ignition synchronization, starter and solenoid testing, and water pump checks.
• Powerhead overhaul covers removal from the exhaust housing, cylinder head and reed service, exhaust and bypass covers, piston and connecting rod inspection, crankshaft service, cylinder honing, reassembly, and break-in.
• Fuel system service includes fuel pump and line tests, carburetor disassembly and float adjustment, heat/electric, all-electric, and water choke service, and fuel tank service.
• Ignition diagnosis covers distributor magneto, distributor battery, and sensor- and breaker-point capacitor-discharge systems, including timing, circuit tests, and component replacement.
• Lower unit service includes shift troubleshooting, water pump overhaul, gearcase disassembly and assembly, shimming, and procedures for removing a seized propeller shaft.
• Charging, starting, and controls cover generator and alternator circuits, Delco-Remy, Autolite, and Prestolite starter rebuilds, Johnson electric controls, Evinrude pushbutton controls, and Hydro-Electric shift boxes.
• Exploded views and schematics show three-cylinder and late V4 powerheads, Types I–V lower units, CD ignition tests, shift circuits, and model-specific wire identification.

Match the Ignition and Lower Unit

Use the engine identification tag and the appendix to match the model number, cylinder count, displacement, ignition type, and carburetor type. Check the installed gearcase before ordering seals or choosing a rebuild procedure. The manual describes several gearcases for the 75 HP outboard alone.

Wiring examples include the 1968 55 HP three-cylinder, 1968 electric-shift 85 HP V4, 1967–1968 CD-ignition 100 HP V4, and 1972 alternator-equipped 100 and 125 HP V4 outboards. The CD ignition chapters cover fault isolation and replacement of failed components.

Overhaul Limits, Tools, and Maintenance

Powerhead. The overhaul sequence starts with the cowling and bolt-on accessories removed. Early two-ring and later three-ring V4 crankshafts are not interchangeable. Later six-ring designs eliminate the labyrinth seals. The manual addresses three-cylinder pistons, bearings, seals, and reeds separately where their construction differs.

Fuel pumps and hand starters. One fuel pump design has a rebuild procedure. The other designs are serviced at the filter and cover, with a failed pump replaced as an assembly. Hand-starter service covers disassembly, inspection, reassembly, rope installation, and neutral-safety operation.

Special tools and repair cautions. Tool references include OMC No. 317002 for carburetor orifices, No. 380546 for Type II carburetor floats, and No. 312752 for holding the driveshaft. The manual identifies the correct insertion side for tapered crankcase centering pins. For the specified bearing on 1972 Type V gearcases, it calls for puller No. 385546 to avoid breaking the housing lip.

Maintenance covers lower unit lubrication, winter storage, battery storage, and preseason preparation. Overhaul and electrical diagnosis are suited to experienced home mechanics and marine technicians working with measuring tools, pullers, and electrical test equipment.

Spark Plug Gap and Gear Oil Capacity Examples

The general tune-up notes specify a spark plug gap of 0.030 inch for the engines listed in the appendix.

For the 1968 85 HP V4, the gear oil table lists 17.4 ounces for the electric-shift version and 19.5 ounces for the manual-shift version. Identify the installed lower unit before using the capacity table.