# 816761Q6 Mercruiser Spark Plug Kit | Genuine Used Part

🔧 Product Description

  

Genuine MerCruiser Spark Plug Wire Set - Part Number: 84-816761Q6

  

A genuine MerCruiser spark plug wire set used on MerCruiser 3.7L / 224ci four-cylinder engines. This wire set cross-references with Sierra 18-8808-2 and is used on 470-family engines including 165HP, 170HP and 185HP conventional ignition applications.

  

⚙️ Key Features

  

• Genuine MerCruiser spark plug wire kit

• Correct OEM part number 84-816761Q6

• Also cross-referenced with 84-813720A6

• Used on MerCruiser 3.7L / 224ci 4-cylinder engines

• Conventional ignition wire set

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 84-813720A6 / 84-816761Q6 current wire set family reference

  

OEM / Related Numbers:

  

• 816761Q6

• 84-816761Q6

• 84-813720A6

• Spark plug wire set

• Marine ignition wire set

• 3.7L / 224ci wire kit

  

Aftermarket / Verified Equivalents:

  

• Sierra 18-8808-2

• Sierra 18-8808

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser 3.7L / 224ci 4-cylinder engines

• MerCruiser 470-family conventional ignition systems

  

Typically suits:

  

• MerCruiser 470 3.7L 4-cylinder

• MerCruiser 165HP 3.7L / 224ci

• MerCruiser 170HP 3.7L / 224ci

• MerCruiser 185HP 3.7L / 224ci

• MerCruiser 470 / 488 type 4-cylinder engines

• HP Range: 165HP / 170HP / 185HP

• Engine Type: MerCruiser 3.7L 4-cylinder gasoline engine with conventional ignition

• Year Range: 1985-1989 commonly listed for Sierra 18-8808-2 applications; engine-family controlled outside those years

• Serial Note: Confirm by engine model, distributor style and wire routing before installation.

  

🔌 Function

  

The spark plug wire set carries high-voltage spark from the distributor and coil circuit to the spark plugs while maintaining correct routing and insulation.

  

Common signs of failure:

  

• Misfire under load

• Crossfire between leads

• Hard starting

• Rough idle

• Visible spark arcing in the dark

• Cracked boots or hardened wires

• Corroded terminals inside plug boots

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 5.0 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 | 5.00 AUD | In stock |

## Images

- 816761Q6 Mercruiser Spark Plug Kit | Genuine Used Part
- 816761Q6 Mercruiser Spark Plug Kit | Genuine Used Part
- 816761Q6 Mercruiser Spark Plug Kit | Genuine Used Part
- 816761Q6 Mercruiser Spark Plug Kit | Genuine Used Part
- 816761Q6 Mercruiser Spark Plug Kit | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/816761q6-mercruiser-spark-plug-kit-genuine-used-part)
> Updated: 2026-06-29