1996 Mercury 45 Jet, 50, 55 Marathon, 55 SeaPro, 60, 60 Big Foot, 60 Marathon, and 60 SeaPro Outboard Motors Service Manual (P/N 90-817643R1)
Mercury Models Covered & Key Technical Specifications
Models: Mercury Outboard Motors 45 Jet, 50, 55 Marathon, 55 SeaPro, 60, 60 Big Foot, 60 Marathon, 60 SeaPro
Sub-models / Variants: Electric Start (ELPTO), ELO, Manual Start (ML), Short Shaft, Long Shaft, Extra Long Shaft
Model Years: 1996
Serial Numbers: United States 0D000750 and Above, Belgium 09671687 and Above
Technical Data:
- Engine displacement: 51.8 cu. in. (849cc)
- Engine configuration: 3-Cylinder, 2-Stroke Loop Charged
- Idle RPM: 675 +/- 25 RPM
- WOT RPM Range: 5000–5500 RPM
- Alternator Output (Electric Models): 16 Amperes @ 3000 RPM
- Spark Plug Gap: 0.040 in. (1.0 mm)
- Fuel/Oil Ratio: 50:1 (25:1 Break-In)
- Lower Unit Capacity (50/55/60): 11.5 fl. oz. (340 ml)
- Lower Unit Capacity (60 Big Foot/SeaPro/Marathon): 22.5 fl. oz. (655 ml)
- Cylinder Bore (Standard): 2.955 in. (75.057 mm)
- Firing Order: 1-3-2
Mercury Manual Features & Content Preview
- Covers 1996 Mercury Outboard Motors 45 Jet, 50, 55, and 60 HP models (including Marathon, SeaPro, and Big Foot variants)
- Official OEM publication P/N 90-817643R1, published December 1996
- Contains 565 pages of technical specifications, exploded-view diagrams, wiring schematics, and service procedures
- Serves as the definitive first-edition reference for these specific engine builds
Service and Maintenance Overview
This factory publication delivers comprehensive technical data for maintaining and overhauling the 45 Jet, 50, 55, and 60 HP outboard series. It breaks the engine down into seven core sections: General Information and Specifications, Electrical and Ignition, Fuel Systems, Powerhead, Mid-Section, Lower Unit, and Outboard Installation. Inside, you will find everything from basic lubrication points and periodic inspection schedules to advanced cooling system flushing, submersion recovery, and out-of-season storage procedures. The fuel carburetion chapters feature detailed exploded-view diagrams of WME-series carburetors. For electrical diagnostics, the manual provides exact stator resistance values, rectifier test sequences, and starting circuit troubleshooting steps for both regulated and unregulated systems.
Engine and Technical Data Preview
Technical specifications cover the 849cc, 3-cylinder powerhead. The document lists standard bore dimensions at 2.955 in. (75.057 mm) with a stroke of 2.520 in. (64.008 mm). Fuel system parameters include fixed jet sizes across the different model configurations, alongside recommended oil ratios using Quicksilver TC-W II or TC-W3. You also get critical electrical reference data for ignition timing, noting a maximum advance of 24° BTDC for 50/60 models at cranking speed. Intake reed valve stops are specified at a maximum opening of 0.020 in. (0.50 mm). Working on marine powerheads carries inherent mechanical risks. Always follow standard shop safety protocols and review all factory hazard warnings before starting any maintenance. Please note that this page serves strictly as an overview of the manual's contents and does not provide actual diagnostic or repair instructions.
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