Wuxi Fergus Intelligent Technology Co., Ltd.
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The Power Trim & Tilt Assembly (part numbers 8M0090335 and 8M0171818) is a key component used on Mercury / Mariner outboard engines, responsible for adjusting the engine’s trim and tilt angle to optimize performance, efficiency, and comfort during navigation.
This assembly is also called a Power Trim/Tilt Unit. It allows the outboard motor to be raised or lowered by hydraulic or electric actuation, adjusting the engine angle to match varying load, speed, and water conditions.
Part numbers 8M0090335 and 8M0171818 are often used interchangeably or as direct replacements for one another.
The assembly fits outboards ranging from 65 HP – 125 HP, produced approximately between 1988 and 2014
It is commonly listed as suitable for Mercury / Mariner 75HP, 90HP (3-cyl) and 100HP, 115HP (4-cyl) outboard engines
For marine accessory manufacturers or dealers (such as those handling trim tabs and jackplates), this assembly plays an important role:
It adjusts the propeller thrust angle and engine depth to improve the boat’s running attitude.
It helps reduce fuel consumption, increase speed, and stabilize performance in varying water conditions.
When a jackplate or trim tab system is installed, a reliable trim/tilt unit becomes critical to handle the larger movement range and higher loads on the engine mount.
When purchasing or recommending the Power Trim & Tilt Assembly (8M0090335 / 8M0171818), pay attention to:
Engine Power and Model Compatibility
Always confirm engine HP, cylinder configuration, and year of manufacture.
Even within similar HP ratings, mounting dimensions or hydraulic linkage lengths can differ.
Part Number Interchangeability
Many aftermarket parts list both numbers as interchangeable, but physical verification is advised.
Ensure hydraulic fittings, connectors, and wiring layouts are identical before substitution.
Electrical System Compatibility
Check voltage (usually 12 V), wire count, and control harness compatibility.
Make sure the motor bracket and transom mount interface correctly with the assembly.
Mounting Space and Fitment
Verify bolt spacing and clearance between the trim/tilt unit, jackplate, and transom bracket.
Ensure there’s no interference when the motor is fully tilted up or down.
Quality and After-Sales Support
1-year warranty
Corrosion resistance and sealing quality are essential for long-term operation in saltwater environments.
Disconnect the outboard power supply before installation to prevent accidental activation.
Check hydraulic oil levels or the electric motor’s condition before use.
Inspect all bolts, welds, and brackets for cracks—especially if a jackplate or trim tab is installed, as these increase mechanical load.
Periodically verify that the actuator moves smoothly without binding. Salt, sand, or corrosion can slow operation.
Use trim adjustment wisely at takeoff, cruising, and shallow water operation to avoid cavitation and improve acceleration.
Because a failed trim/tilt assembly can directly affect safety and handling, it is recommended to stock a spare unit for emergency replacement.
