5288T2 8M0166172 Mercury Coil | Genuine Used Part

🔧 Product Description

Genuine Mercury Ignition Coil - Part Number: 8M0166172 / 5288T2

A genuine Mercury / Quicksilver ignition coil used on selected Mercury and Mariner outboard ignition systems. This coil is commonly listed under the 339-5288T2 coil family and supplies high-voltage spark output to the plug lead on supported two-stroke outboard engines.

⚙️ Key Features

• Genuine Mercury ignition coil

• Correct Mercury replacement number 8M0166172

• Also listed as 5288T2 and 339-5288T2

• Used on selected Mercury / Mariner outboard ignition systems

• Must be matched by exact engine serial number, cylinder position and coil connector style

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 339-5288T2 superseded / serviced by 8M0166172

• 5288T2 current related Mercury coil reference

• 8M0166172 current Mercury / Quicksilver ignition coil reference

OEM / Related Numbers:

• 8M0166172

• 5288T2

• 5288T 2

• 339-5288T2

• 339-5288T 2

• 339-5288

• Mercury ignition coil

• Quicksilver ignition coil

• UPC: 745061092877

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Mercury / Mariner two-stroke outboard ignition systems

• Selected 2-cylinder and 3-cylinder carbureted outboards using the 339-5288T2 coil layout

• Coil positions where the original coil is marked 5288T2 / 339-5288T2

Typically suits:

• Engine models:

• Mercury 40HP two-stroke - serial-number controlled

• Mercury 50HP two-stroke - serial-number controlled

• Mercury / Mariner 40HP and 50HP carbureted outboards using 5288T2 coil layout

• Selected Mercury / Mariner 2-cylinder and 3-cylinder ignition assemblies where 339-5288T2 is shown on the serial-numbered ignition diagram

• HP Range: commonly 40HP / 50HP, with additional serial-controlled Mercury / Mariner two-stroke applications

• Engine Type: Mercury / Mariner two-stroke carbureted outboard ignition system

• Year Range: serial-number controlled

• Serial Note: Match the engine serial number and original coil number before installation. Coil connector style, mounting position and plug-lead routing must match the engine harness.

🔌 Function

The ignition coil converts low-voltage ignition input into the high-voltage spark required at the spark plug. A weak or failed coil can cause poor spark output, intermittent running faults or complete loss of ignition on the affected cylinder.

Common signs of failure:

• No spark on one cylinder

• Weak or inconsistent spark

• Misfire under load

• Hard starting

• Rough idle

• Engine drops a cylinder when warm

• Cracked coil body

• Corroded terminals or damaged plug lead connection

• Spark returns or disappears when wiring is moved

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated