# 108M0176309 Mercury MerCruiser Screw | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Upper Motor Mount Screw - Part Number: 10-8M0176309

  

A genuine Quicksilver screw used in selected Mercury V6 outboard upper motor mount and swivel bracket assemblies. This screw supersedes 8M0000491 and cross-references with the earlier 10-78689 / 78689 upper motor mount screw family where specified by the Mercury diagram.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM screw

• Correct Mercury part number 10-8M0176309

• Supersedes 8M0000491

• Cross-referenced with upper motor mount screw 10-78689 / 78689 in catalogue-use applications

• Used in Mercury V6 midsection / upper motor mount saddle locations where specified

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 10-8M0176309 → Supersedes 8M0000491

• 8M0000491 earlier OEM screw reference

• 10-78689 / 78689 related upper motor mount screw reference where specified

  

OEM / Related Numbers:

  

• 10-8M0176309

• 8M0176309

• 108M0176309

• 8M0000491

• 10-78689

• 78689

• 78687 related upper motor mount reference

  

Aftermarket / Verified Equivalents:

  

• No direct aftermarket equivalent recommended over OEM for upper motor mount hardware

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury V6 outboard upper motor mount and swivel bracket assemblies

• Mercury high-performance and V6 midsection mounting hardware locations

  

Typically suits:

  

• Engine / assembly models:

• Mercury V6 Black Max 135HP upper motor mount screw applications where 10-78689 / 8M0176309 is specified

• Mercury V6 Black Max 150HP upper motor mount screw applications where specified

• Mercury V6 Black Max 175HP upper motor mount screw applications where specified

• Mercury 175HP V6 Black Max upper motor mount screw / mount saddle applications where 8M0176309 is specified

• Mercury 225 Magnum Racing outboard swivel bracket and steering arm long applications, 1998 7922300GH diagram family where 10-8M0176309 is specified

• Mariner 175MG swivel bracket and steering arm applications, 1992 7175413AD diagram family where 10-8M0176309 is specified

• Mercury V6 midsection and bracket assemblies using upper motor mount saddle screw 78689 / 8M0176309

  

• Engine Type: Mercury / Mariner V6 two-stroke outboard applications where specified

• System Type: Upper motor mount / swivel bracket screw

• Fitment Note: This is a diagram-location-specific screw. The most reliable fitment check is the engine serial-numbered swivel bracket / upper motor mount diagram, not HP alone.

  

🔌 Function

  

The screw secures the upper motor mount / midsection mounting hardware, helping retain the mount saddle and support engine vibration isolation and steering bracket alignment.

  

Common signs replacement is needed:

  

• Screw seized or corroded in mount assembly

• Damaged threads or head

• Missing hardware during upper mount service

• Mount saddle movement or incorrect hardware found

• Replacement required during swivel bracket or motor mount repair

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 13.6 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 13.60 AUD | In stock |

## Images

- 108M0176309 Mercury MerCruiser Screw | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/108m0176309-mercury-mercruiser-screw-genuine-quicksilver-oem-part)
> Updated: 2026-05-17