New Mercruiser 4.5L Engine

Jun 26, 2014

Engineered with innovative new features and state-of-the-art technology, the new Mercury MerCruiser 4.5L 250hp sterndrive was designed and is manufactured at Mercury Marine’s world headquarters in Fond du Lac, Wisconsin. “We are proud to introduce the next generation of sterndrive technology with this ground-breaking new engine,” said Mercury Marine President John Pfeifer. “This is a great power source that provides features, benefits and technology that make boating more enjoyable and worry-free. This engine was purpose-built for marine use and it delivers Mercury’s proven performance, durability and ease of service.” The MerCruiser 4.5L establishes new standards for acceleration and overall performance, thanks to design innovations such as a long runner scrolled intake manifold and high displacement, which produces an outstanding power-to-weight ratio. This V-6 engine weighs 130 pounds less than a 5.0L V-8 small block, yet provides similar performance. The 4.5L is a “good citizen” on the water, providing maximum fuel efficiency and exceptionally quiet operation. Its newly designed rear-facing throttle body, anti-whistle throttle plate, engine cover and mounts, lightweight flywheel, fuel supply module, and structural oil pan all work together to deliver superior idle and smoothness and low noise and vibration for a better boating experience. The MerCruiser 4.5L is a technology-rich platform that delivers the world’s first V-6 sterndrive that’s compatible with SmartCraft Digital Throttle & Shift (DTS) for immediate throttle response and smooth shifting throughout the rpm band. An option for the 4.5L V-6 with DTS is Joystick Piloting, providing the ultimate in docking experience and maneuverability. The 4.5L V-6 also offers Adaptive Speed Control (ASC), which automatically maintains the set rpm point regardless of load or condition changes, such as tight turns, tow sports and lower speeds on plane. The result is increased throttle response and a “sportier” feel for the driver, who no longer has to make continual throttle-control adjustments. Mercury Marine built the ultimate anti-corrosion protection system into the 4.5L V-6, using durable cast-iron componentry wherever the engine encounters seawater, and corrosion-resistant aluminum and composites everywhere else. Digital rather than analog sensors are used throughout. As with all MerCruiser engines, the 4.5L sterndrive comes with a standard three-year corrosion warranty, plus Mercury’s limited manufacturer’s warranty of up to two years. Mercury paid particular attention to ease of maintenance when designing the MerCruiser 4.5L V-6, eliminating the need for the traditional 20-hour service. This unit features a maintenance center near the top-front section of the engine, ensuring that consumer touch-points – including oil filter and fill – are easily identifiable and accessible. Additionally, the valve train is maintenance-free for the life of the engine, and a QR code on the engine’s service label allows smartphone users to access “how-to” videos online. The 4.5L V-6 also boasts a “season-extending” drain system that can keep you boating during the transition times between seasons. Available in single or twin installations and compatible with Mercury’s full series of Alpha and Bravo Drives, the MerCruiser 4.5L offers ultimate flexibility to OEMs, marine dealers and consumers in creating the ideal propulsion package for a wide range of boats from runabouts to cruisers. The engine’s smaller size leaves extra space for additional options by boatbuilders.