855998A11 8M0168222 Mercury Power Trim Assembly | Genuine Used Part

🔧 Product Description

Genuine Mercury V6 Three-Ram Power Trim Assembly - Part Number: 8M0168222

A genuine Mercury three-ram hydraulic power tilt and trim assembly for selected high-horsepower Mercury, Mariner, OptiMax, Pro XS, Racing and Verado outboards.

Part number 8M0168222 superseded 855998A11 and has since been replaced by 8M0231193. The unit combines an electric hydraulic pump, centre tilt cylinder and two running-trim cylinders.

⚙️ Key Features

• Genuine Mercury OEM three-ram power-trim assembly
• Listing references 855998A11 and 8M0168222
• Current service replacement 8M0231193
• Used on selected V6 two-stroke, DFI, EFI and four-stroke outboards
• Cross-references with Sierra, API Marine, SEI and remanufactured replacements

🚤 Compatibility

Commonly used on

• Mercury and Mariner V6 outboard transom-bracket assemblies
• OptiMax, Pro XS, Racing, EFI and applicable Verado power-trim systems

Typically suits

• Engine models:
• Mercury 2.5L EFI 135HP
• Mercury 2.5L EFI 150HP
• Mercury 2.5L EFI 175HP
• Mercury 2.5L EFI 200HP
• Mercury 2.5L OptiMax / DFI 135HP
• Mercury 2.5L OptiMax / DFI 150HP
• Mercury 2.5L OptiMax / DFI 175HP
• Mercury 2.5L OptiMax / DFI 200HP
• Mercury 3.0L EFI 200HP
• Mercury 3.0L EFI 225HP
• Mercury 3.0L EFI 250HP
• Mercury 3.0L EFI 300HP
• Mercury 3.0L OptiMax / DFI 200HP
• Mercury 3.0L OptiMax / DFI 225HP
• Mercury 3.0L OptiMax / DFI 250HP
• Mercury 3.0L OptiMax / DFI 300HP
• Mercury Pro XS 150HP
• Mercury Pro XS 175HP
• Mercury Pro XS 200HP
• Mercury Pro XS 225HP
• Mercury Pro XS 250HP
• Mercury Racing 200XS
• Mercury Racing 2.5XS
• Mercury Racing 250XS
• Mercury Racing 300XS
• Mercury Verado L4 135HP
• Mercury Verado L4 150HP
• Mercury Verado L4 175HP
• Mercury Verado L4 200HP
• Mercury / Mariner high-horsepower applications whose transom diagram specifies 855998A11, 8M0168222 or 8M0231193
• HP Range: Commonly 135HP - 300HP
• Engine Type: Mercury / Mariner V6 EFI, DFI / OptiMax, Pro XS, Racing and selected supercharged four-stroke outboard
• Year Range: Approximately 1992-2018, dependent on transom-bracket generation

🔌 Function

The centre cylinder provides the main tilt movement, while the two outer cylinders support controlled trim adjustment under engine thrust. The integrated electric pump and valve body raise, lower and hydraulically lock the engine.

⚠️ Common Signs of Failure

• Engine slowly settles after trimming
• Pump motor runs without hydraulic movement
• Hydraulic fluid leaks at ram seals or valve body
• Trim operates in only one direction
• Slow operation under load
• Pitted or corroded ram rods
• Excessive current draw or overheated trim motor
• Unequal extension of the trim rams

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 8M0231193 → Supersedes 8M0168222
• 8M0168222 → Supersedes 8M0143219
• 8M0143219 → Supersedes 855998A11
• 855998A11 → Supersedes 855998A10
• 855998A10 → Supersedes 855998A09
• 855998A09 → Supersedes 855998A08
• 855998A08 → Supersedes 855998A07
• 855998A07 → Supersedes 855998A05
• 855998A05 earlier OEM three-ram trim assembly
• 826729T2 earlier related three-ram trim unit

OEM / Related Numbers

• 8M0231193
• 8M0168222
• 8M0143219
• 855998A11
• 855998A10
• 855998A09
• 855998A08
• 855998A07
• 855998A05
• 826729T2
• Mercury two-wire V6 three-ram power-trim assembly

Aftermarket / Verified Equivalents

• Sierra: 18-6800
• API Marine: TT2001
• Sterndrive Engineering: TT2001 / 855998A11 replacement assembly
• Five Star Marine: remanufactured 855998A11 / 8M0168222 unit
• Marine hydraulic rebuilders: V6 three-ram trim-unit rebuild service

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated