1976 Chrysler 15 HP Outboard Specs & Part Numbers
Introduction
The 1976 Chrysler 15 HP outboard motor is a classic, lightweight, two-stroke marine engine that remains a favorite among vintage boat enthusiasts and budget conscious anglers. Produced during an era when Chrysler was a dominant force in the marine industry, this twin-cylinder motor is celebrated for its mechanical simplicity, power-to-weight ratio, and ease of maintenance.
This technical guide provides comprehensive specifications, maintenance data, and historical context to help owners keep these reliable vintage workhorses running smoothly.
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Overview & Specifications
The 1976 Chrysler 15 HP outboard utilizes a loop-charged, two-cylinder powerhead. It was engineered to deliver reliable performance for utility boats, small skiffs, and inflatable tenders.
| Specification Parameter | Technical Data |
|---|---|
| Horsepower | 15 HP @ 5,500 RPM |
| Engine Type | 2-Cylinder, 2-Stroke (Cycle) |
| Displacement | 19.96 cubic inches (approx. 327 cc) |
| Bore x Stroke | 2.187 in. x 1.750 in. (55.5 mm x 44.4 mm) |
| Fuel/Oil Ratio | 50:1 (Regular Unleaded Gasoline to TC-W3 Outboard Oil) |
| Cooling System | Water-Cooled (Impeller driven by driveshaft) |
| Starting System | Manual Recoil (Rope start) / Electric start options available |
| Weight | Approximately 58 lbs (26.3 kg) – Short Shaft model |
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Common Maintenance & Tune-up Specs
Keeping a vintage Chrysler 15 HP running reliably requires adherence to original factory tune-up specifications. Because these engines utilize a traditional magneto ignition system, precise gapping of the points and spark plugs is critical to preventing misfires and hard starting.
Ignition & Electrical System
- Recommended Spark Plug: Champion L82C (or modern equivalent NGK BR7HS / BR7HS-10).
- Spark Plug Gap: 0.030 inches (0.76 mm).
- Ignition Type: Flywheel Magneto with Points and Condensers.
- Points Gap: 0.020 inches (0.51 mm) at high point of cam.
- Ignition Timing: Set at factory specifications (timed via stator plate alignment).
Fuel & Carburetion
- Carburetor Type: Tillotson or Walbro float-feed single-throat carburetor (model variations apply).
- Low-Speed Idle Mixture Adjustment: Initial bench setting is typically 1 to 1-1/4 turns out from gently seated. Fine-tune when the motor is warm and idling in gear.
- Fuel Type: 87 Octane unleaded gasoline mixed with a high-quality TC-W3 2-cycle marine oil at a 50:1 ratio (approx. 2.6 oz of oil per 1 gallon of gasoline). Avoid high ethanol blends (E15/E85) as they degrade vintage rubber gaskets and fuel lines.
Water Pump & Cooling System
The cooling system relies on a rubber impeller located in the upper portion of the gearcase housing. If the engine has been sitting idle for more than a year, the impeller should be replaced to prevent dry-rotting and subsequent engine overheating.
- Impeller Replacement: Accessible by dropping the lower unit. Be sure to align the keyway drive pin on the driveshaft during installation.
- Water Tube Alignment: Ensure the copper water tube seats securely in the top of the water pump housing grommet upon reassembly.
Lower Unit / Gearcase Lubrication
- Gear Lubricant Type: Marine SAE 90 Outboard Gear Lubricant (Hypoid Premium Blend).
- Capacity: Fill from the bottom drain screw hole until fluid begins to weep out of the top vent screw hole (approximately 7-9 fluid ounces).
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Notable Features & History
The West Bend Legacy
The roots of the 1976 Chrysler 15 HP trace back to the West Bend Aluminum Company’s outboard division, which Chrysler purchased in 1965. Chrysler modernized these lightweight, proven designs, implementing upgraded cowlings, corrosion-resistant metals, and refined ignition systems. The 15 HP model sits in a “sweet spot” of design evolution, showcasing the transitional phase between pure mechanical vintage engineering and modern lightweight materials.
Design Highlights
- Low Profile & Light Weight: Weighing under 60 pounds, the 1976 Chrysler 15 HP was one of the easiest motors in its class to transport, mount, and store.
- Low-Maintenance Magneto: While competitors were shifting toward complex, expensive electronic CDI (Capacitor Discharge Ignition) boxes, the Chrysler 15 HP retained a highly serviceable mechanical points magneto, allowing DIY owners to perform tune-ups with basic hand tools.
- Interchangeability: Many components (such as brackets, starter assemblies, and lower unit parts) are interchangeable with Chrysler’s 9.9 HP models from the same era, making sourcing replacement parts relatively straightforward in the vintage aftermarket.
Historical Context & Transition to Force Outboards
By the late 1970s, Chrysler Marine began scaling back its operations due to corporate financial hardships, eventually selling its outboard division to US Marine (Bayliner) in 1984. This line of outboards was rebranded as Force Outboards. Consequently, the mechanical architecture of the 1976 Chrysler 15 HP survived well into the 1990s under the Force nameplate, securing its legacy as one of the most long-lived and widely distributed marine engine platforms in history.