# 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• 339-5288T2 superseded / serviced by 8M0166172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

## Details

- **Price:** 20.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Electronic Components | ECU CDI & Electrical Parts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 20.00 AUD | In stock |

## Images

- 5288T2 8M0166172 Mercury Coil | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/5288t2-8m0166172-mercury-coil-genuine-used-part)
> Updated: 2026-06-29