Part Number: 47-5908
Sierra 18-5908 Marine Starter
Restore strong, dependable starting power with the Sierra 18-5908 Starter, a heavy-duty marine starter designed to meet or exceed OEM performance standards. Built for reliability in harsh environments, this unit delivers consistent cranking power to get your engine turning over quickly—whether you’re launching for the first time or restarting after a long day on the water.
Engineered as a direct replacement for a wide range of inboard and sterndrive engines, the 18-5908 features a top-mount, rear-entry design with counter-clockwise rotation. It’s built with marine-grade components and ignition-protected construction, making it safe for use in enclosed engine compartments and resistant to heat, vibration, and moisture.
This starter is commonly used on Mercury Marine 3.7L (470 series) engines as well as select Crusader, PCM, and OMC applications, making it a versatile solution across multiple platforms.
Common Engine & Boat Fitments
The Sierra 18-5908 is found on a variety of inboard and sterndrive setups, including:
- MerCruiser 3.7L (470, 485, 488) engines
- PCM and Crusader 4-cylinder and select V8 applications
- OMC sterndrive engines
Typical boat applications include:
- Sea Ray 180 Bowrider, 200 Select, and Sundancer series
- Bayliner Capri 185, 195, and 205 models
- Four Winns Horizon 180 and 200
- Chaparral 1830 and 1930 SS
- Supra Sunsport and Supra Comp (Indmar or PCM-powered configurations)
- Moomba Outback and early Moomba Mobius models with compatible engine setups
Fitment can vary by engine configuration, mounting style, and rotation, so confirming compatibility with part number 18-5908 is recommended before ordering.
Key Features
- Heavy-duty marine starter designed for OEM replacement
- High-torque output for reliable engine cranking
- Top-mount, rear-entry configuration
- Ignition-protected for safe marine operation
- Built to withstand heat, vibration, and moisture
- Compatible with Mercury, OMC, PCM, and Crusader engines
If your engine is struggling to turn over or showing signs of starter failure, the Sierra 18-5908 offers a dependable, factory-style solution. It’s a proven replacement that helps restore quick starts and keeps your boat ready for every trip on the water.