Upgrade Your Outboard's Trim System with the Sierra 18-2136 Trim Hose

Keep your boat's power trim and tilt system running smoothly on the water with the Sierra 18-2136 trim hose. Designed as a direct-fit replacement for OEM part 55-698, this high-pressure hose features a reliable star fitting that ensures secure connections and leak-free performance. Whether you're dealing with cracks, bulges, or wear from constant exposure to saltwater and engine oils, this hose restores hydraulic integrity to your Mercury or compatible outboard engine.

Crafted from durable, oil- and fuel-resistant rubber reinforced with a braided nylon cover, it withstands the rigors of marine environments. Boaters trust Sierra parts for their consistent quality and affordability, making this trim hose a smart choice for weekend warriors and professional mechanics alike.

Key Features of the Sierra 18-2136

• Star Fitting Design: Matches the OEM star connector for precise, hassle-free installation without adapters.
• High-Pressure Rating: Handles up to 1,000 PSI, perfect for demanding trim and tilt operations.
• Reinforced Construction: Braided nylon exterior resists abrasion, kinking, and environmental damage.
• Universal Compatibility: Fits a wide range of Mercury, Mariner, and other outboard models from the 1970s through the 2000s.
• Meets or Exceeds OEM Specs: Engineered to SAE J1177 standards for hydraulic applications in marine settings.

Perfect Fit for Popular Outboard Models

The Sierra 18-2136 is engineered for seamless integration with Mercury outboards equipped with power trim systems. It's commonly used on models like the 90-300 HP 4-cylinder and V6 engines, including Force, Chrysler, and Bayliner variants. Always cross-reference with your engine's serial number for exact fitment, but this hose serves as a go-to replacement for the factory 55-698 trim hose found in tilt ram circuits.

Pro tip: Inspect your existing hose for swelling near fittings or soft spots—these are early signs of failure that this upgrade addresses head-on.

Why This Trim Hose Outperforms the Rest

Unlike generic hoses that fail prematurely, the Sierra 18-2136 delivers long-term reliability. It prevents hydraulic fluid leaks that can lead to sluggish trim response, erratic engine height adjustment, or complete system failure mid-trip. By maintaining optimal pressure, it protects your outboard's lower unit and transom from strain, extending the life of connected components like the trim pump and cylinders.

Boat owners report smoother operation and fewer maintenance calls after swapping in this hose, especially in harsh coastal conditions where UV exposure and corrosion accelerate wear.

Simple Installation Steps for DIY Boaters

Replacing your trim hose doesn't require a marine yard lift. Here's a straightforward guide:

1. Power down the engine and relieve hydraulic pressure by cycling the trim several times with the key off.
2. Disconnect the battery and locate the trim hose at the tilt cylinder or pump assembly.
3. Use flare nut wrenches to loosen fittings—avoid pliers to prevent damaging the star connector.
4. Drain residual fluid, remove the old hose, and route the new Sierra 18-2136 in the same path.
5. Tighten connections to spec (typically 15-20 ft-lbs), refill with marine hydraulic fluid, and bleed air from the system.
6. Test on the water at low speeds before full-throttle runs.

Tools needed: Wrenches, flare nut set, catch pan, and fresh hydraulic oil. Total time: under an hour for experienced hands.

Maintenance Tips to Maximize Hose Lifespan

To get years of service from your Sierra 18-2136:

• Rinse with fresh water after every saltwater outing to remove corrosive residues.
• Visually inspect annually for chafing or leaks, especially where the hose flexes during trim.
• Store your boat with the outdrive trimmed down to minimize hose stress.
• Avoid over-pressurizing the system—listen for unusual pump whining as a warning sign.

Pair it with quality filters and fluid changes every 100 hours for peak performance.

Frequently Asked Questions