8M0171818 8M0090335 Mercury Trim Assembly | Genuine Used Part

🔧 Product Description

Genuine Mercury Power Tilt and Trim Assembly - Part Number: 8M0171818

A genuine Mercury hydraulic power tilt and trim assembly for selected 65 Jet through 125HP outboards. The current assembly supersedes 8M0090335 and combines the electric motor, hydraulic pump, valve body, reservoir and lift cylinder.

This listing is for the trim assembly only; an anchor bracket is not included unless it is shown in the product photographs or specifically stated.

⚙️ Key Features

• Genuine Mercury OEM power tilt and trim assembly
• Current service number 8M0171818
• Supersedes 8M0090335
• Complete electric-hydraulic lift and trim mechanism where supplied as pictured
• Used on selected three-cylinder and inline four-cylinder Mercury outboards

🚤 Compatibility

Commonly used on

• Mercury and Mariner three-cylinder and inline four-cylinder transom assemblies
• Carburetted, EFI, SeaPro, Pro XS and Jet outboards using the later complete trim unit

Typically suits

• Engine models:
• Mercury 75HP three-cylinder - serial 0T980000 to 0T999999
• Mercury 75HP three-cylinder - serial 1B000000 and above
• Mercury 90HP three-cylinder - serial 0T980000 to 0T999999
• Mercury 90HP three-cylinder - serial 1B000001 and above
• Mercury 75HP international - serial 0P325500 and above
• Mercury 90HP international - serial 0P325500 and above
• Mercury 65 Jet three-cylinder - serial 0T980000 to 0T999999
• Mercury 65 Jet three-cylinder - serial 1B000001 and above
• Mercury 75 EFI - serial 1B366823 to 2B094995
• Mercury 80 EFI - serial 1B366823 to 2B094995
• Mercury 80 EFI international - serial 0P459572 to 2B094995
• Mercury 90 EFI - serial 1B366823 to 2B094995
• Mercury 100 EFI - serial 1B366823 to 2B094995
• Mercury 100 EFI international - serial 0P459572 to 2B094995
• Mercury 115 EFI - serial 1B366823 to 2B094995
• Mercury 115 EFI Pro XS - serial 2B225488 and above
• Mercury 75 1.5L three-cylinder - serial 1B736885 to 2B112577
• Mercury 90 1.5L three-cylinder - serial 1B736885 to 1B974258
• Mercury 115 1.5L three-cylinder - serial 1B736885 to 2B018763
• Mercury 80 Jet 1.5L three-cylinder - serial 1B736885 to 2B111840
• Mercury 125 1.5L three-cylinder - serial 1B736885 to 2B112787
• Mercury 115 Pro XS 1.5L - serial 1B751825 to 2B123429
• Mercury 75 EFI - serial 2B095049 and above
• Mercury 75 EFI SeaPro - serial 2B095049 and above
• Mercury 80 EFI - serial 2B095049 and above
• Mercury 90 EFI - serial 2B095049 and above
• Mercury 90 EFI SeaPro - serial 2B095049 and above
• Mercury 100 EFI - serial 2B095049 and above
• Mercury 115 EFI - serial 2B095049 and above
• Mercury 115 EFI SeaPro - serial 2B095049 and above
• Mercury 65 EFI Jet - serial 2B095049 and above
• Mercury 80 EFI Jet - serial 2B095049 and above
• HP Range: 65 Jet - 125HP
• Engine Type: Mercury / Mariner carburetted and EFI three-cylinder or inline four-cylinder outboard
• Year Range: Approximately late 1990s onward, dependent on serial number

🔌 Function

The electric motor powers a hydraulic pump that extends or retracts the lift cylinder. The valve body controls UP, DOWN and holding pressure so the engine can be tilted for trailering and trimmed while underway.

⚠️ Common Signs of Failure

• Engine will not raise or lower
• Trim motor runs without hydraulic movement
• Engine slowly settles after trimming
• Hydraulic fluid leakage
• Slow movement or operation in only one direction
• Corroded electrical leads or motor housing
• Pitted ram rod or damaged seals
• Excessive current draw from the trim motor

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 8M0171818 → Supersedes 8M0090335
• 8M0090335 earlier OEM power-trim assembly

OEM / Related Numbers

• 8M0171818
• 8M0090335
• 8M0086406 related current anchor bracket
• 818771T1 earlier anchor bracket
• 818771T earlier anchor bracket
• 818771F1 related earlier bracket reference
• Mercury power-trim seal-kit references for the corresponding hydraulic unit

Aftermarket / Verified Equivalents

• FridayParts: FPXQ2407242
• HOLDWELL: 8M0171818 / 8M0090335 replacement trim assembly
• Winibo: 8M0171818 replacement power-trim unit
• Poseidon Marine: seal rebuild kit for the corresponding Mercury trim ram
• Marine hydraulic rebuilders: complete 8M0090335 / 8M0171818 rebuild service

📦 Condition

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