66559 Mercury Swivel Tube | Genuine Used Part

🔧 Product Description

Genuine Mercury Swivel Bracket-to-Saddle Tube - Part Number: 66559

A genuine Mercury swivel tube used between the swivel bracket and saddle assembly on selected small two-cylinder outboards. The tube forms the pivot sleeve through which the steering and swivel components are aligned.

⚙️ Key Features

• Genuine Mercury OEM swivel tube
• Correct Mercury number 66559
• Used between the swivel bracket and saddle
• Approximately 9-1/2 inches long
• Fits selected 4HP to 9.8HP Mercury and Mariner outboards

🚤 Compatibility

Commonly used on

• Mercury and Mariner small-outboard swivel-bracket assemblies
• Swivel bracket-to-saddle pivot locations

Typically suits

• Engine models:
• Mercury 4HP two-stroke
• Mercury 4.5HP two-stroke
• Mercury 7.5HP two-cylinder
• Mercury 9.8HP two-cylinder
• Mercury model 40
• Mercury model 45
• Mercury model 75
• Mercury model 110
• Mercury 9.8HP serial 4839254 to 5206549
• Mercury 110 serial 3263263 to 3795657
• Australian Mercury 110 serial 8015040 to 8050624
• HP Range: 4HP - 9.8HP
• Engine Type: Mercury / Mariner small two-cylinder two-stroke outboard
• Year Range: Approximately 1974-1985

🔌 Function

The tube acts as the internal pivot sleeve between the saddle and swivel bracket. It keeps the steering assembly aligned while allowing the outboard to turn smoothly.

⚠️ Common Signs of Failure

• Excessive side-to-side steering play
• Corrosion or seizure inside the swivel assembly
• Scoring or wear on the tube surface
• Difficulty turning the engine
• Loose or misaligned saddle and swivel components

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 66559 current / final Mercury swivel-tube reference
• 17-63905 earlier related Mercury swivel-pin reference
• 63905 earlier base reference

OEM / Related Numbers

• 66559
• 17-63905
• 63905
• Mercury 40 / 45 / 75 / 110 model-family reference
• 77334 related co-pilot disc
• 52864 related tilt-tube washer

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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