Johnson 50HP, 60HP, 75HP, 80HP, 90HP, 100HP, 115HP, 125HP Evinrude Outboard Motor 1958–1972 Service Manual (P/N J005721)

• 526-page PDF covering 1958-1972 Johnson and Evinrude 50-125 HP outboards, organized for 3-cylinder and V4 two-stroke applications and supported by model-code tables in the appendix.
• Powerhead repair 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 coverage distinguishes Type IA, IB, II, III, IVA, and IVB carburetors and their choke arrangements, with pump and fuel-line testing, carburetor disassembly, float adjustment, fuel-pump repair, and tank service.
• Ignition diagnosis is divided among distributor magneto, distributor battery, sensor-type capacitor-discharge, and breaker-point capacitor-discharge systems, with model-specific testing, component replacement, timing, and carburetor-to-ignition synchronization.
• Lower-unit service spans Type I and II manual-shift, Type III and IV Electramatic, and Type V two-solenoid electric-shift units. Procedures include water-pump service, gearcase disassembly and assembly, shimming, and frozen-propeller-shaft removal.
• Electrical and control sections cover generator and alternator charging circuits, starter and solenoid testing, Delco-Remy, Autolite, and Prestolite starter rebuilds, Johnson electric controls, Evinrude pushbutton controls, and Hydro-Electric shift boxes.
• Repair illustrations and schematics include 3-cylinder and late V4 powerhead exploded views, Type I-V lower-unit drawings, CD ignition test schematics, a shift-circuit troubleshooting diagram, and model-specific wire-identification sheets. Examples include the 1968 55 HP 3-cylinder, 1968 electric-shift 85 HP V4, 1967-1968 CD-ignition 100 HP V4, and 1972 alternator-equipped 100/125 HP V4 layouts.

Match the Exact Configuration

This is not a one-procedure-fits-all book. The appendix ties Johnson and Evinrude model numbers to year, cylinder count, horsepower, displacement, ignition type, and carburetor type. A separate section shows the location of the engine identification tag, but the manual does not provide a serial-number break table. Match the model code and the installed fuel, ignition, control, and gearcase systems before selecting a repair procedure.

The powerhead material also identifies construction changes that matter when ordering parts. It distinguishes early two-ring and later three-ring V4 crankshafts from six-ring designs that eliminate the labyrinth seals; two-ring and three-ring crankshafts are not interchangeable. Three-cylinder piston, bearing, seal, and reed arrangements are addressed separately where their construction differs from the V4.

Repair Depth and Working Level

The overhaul chapters assume that the user can work from measurements, exploded drawings, and special-tool callouts. Powerhead disassembly begins after the cowling and bolt-on accessories have been removed, so every model-specific buildup fastener is not documented. Because the work also calls for pullers, bearing installers, compression and electrical test equipment, and OMC service tools, this manual is best suited to experienced home mechanics and marine technicians rather than a first engine rebuild.

Fuel-pump coverage identifies the pump design that can be rebuilt and explains that the remaining designs are serviced only at the filter and cover before assembly replacement. The hand-starter chapter covers removal, disassembly, inspection, reassembly, rope installation, and neutral-safety operation. Maintenance procedures address submerged-engine recovery, winter storage, lower-unit lubricant service, battery storage, and preseason preparation.

Specifications, Tools, and Repair Cautions

The appendix consolidates component-specific torque specifications, engine and tune-up data, powerhead wear and clearance limits, gear-oil capacities, oil/fuel mixture information, and starter, generator, and regulator electrical specifications. Named tools include OMC No. 317002 for carburetor orifices, OMC No. 380546 for Type II carburetor float adjustment, and OMC No. 312752 for holding the driveshaft during lower-unit work.

The manual warns that inserting a tapered crankcase centering pin from the wrong side can break the crankcase cover or cylinder block. On 1972 Type V electric-shift units, driving the specified bearing downward can break the gearcase housing lip; that section calls out OMC puller No. 385546.

Live-engine troubleshooting involves fuel vapor, rotating components, and high-tension ignition circuits. These tests require suitable ventilation, a cooling-water supply, insulated test equipment, and normal marine-shop safety practices.