# 31861787 Mercury MerCruiser Thrust Bearing | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Bravo Driven Gear / Thrust Bearing - Part Number: 31-861787

  

A genuine Quicksilver driven gear thrust bearing assembly used in MerCruiser Bravo sterndrive upper drive shaft housing applications. This bearing supports driven gear loading inside the drive and is used across Bravo I, Bravo II, Bravo III, Bravo X, Bravo XR and Bravo XZ sterndrive families where the serial-numbered parts diagram specifies 31-861787.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM bearing assembly

• Correct Mercury part number 31-861787

• Driven gear / thrust bearing application

• Used on MerCruiser Bravo sterndrive upper drive assemblies

• Suitable for Bravo serial 0M100001 and above / 2000 and newer applications where specified

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 31-861787 current OEM driven gear / thrust bearing reference

  

OEM / Related Numbers:

  

• 31-861787

• 861787

• 31861787

• 31-861791 related race

• 31-861792 related driven gear bearing assembly

• 31-8M0104358 related Bravo bearing assembly

  

Aftermarket / Verified Equivalents:

  

• No direct aftermarket equivalent preferred over OEM for Bravo drive bearing service

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser Bravo driven gear / upper drive shaft housing bearing applications

  

Typically suits:

  

• Drive models:

• MerCruiser Bravo One - serial 0M100001 to 0W249999

• MerCruiser Bravo One - serial 0W250000 and up

• MerCruiser Bravo Two - serial 0M100001 to 0W249999

• MerCruiser Bravo Two - serial 0W250000 and up

• MerCruiser Bravo Three - serial 0M100001 to 0W249999

• MerCruiser Bravo Three - serial 0W250000 and up

• MerCruiser Bravo X One - serial 0M100001 to 0W249999

• MerCruiser Bravo X One - serial 0W250000 and up

• MerCruiser Bravo X Two - serial 0M100001 to 0W249999

• MerCruiser Bravo X Two - serial 0W250000 and up

• MerCruiser Bravo X Three - serial 0M100001 to 0W249999

• MerCruiser Bravo X Three - serial 0W250000 and up

• MerCruiser Bravo XR applications where 31-861787 is specified

• MerCruiser Bravo XZ applications where 31-861787 is specified

• MerCruiser Bravo I / II / III / X / XR / XZ sterndrives, serial 0M100001 and above, 2000 and newer, where the driven gear bearing 31-861787 is shown in the diagram

  

• Drive Type: MerCruiser Bravo I / II / III / X / XR / XZ

• Serial Range: 0M100001 and up where specified

• System Type: Driven gear / upper drive bearing

  

🔌 Function

  

The bearing supports driven gear thrust and rotational load inside the Bravo drive shaft housing, helping maintain correct gear alignment and smooth drive operation.

  

Common signs of failure:

  

• Upper drive growling or whining noise

• Metal contamination in drive oil

• Bearing roughness during upper drive rebuild

• Gear preload or backlash issue

• Vibration or noise under load

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 66.25 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 66.25 AUD | In stock |

## Images

- 31861787 Mercury MerCruiser Thrust Bearing | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/31861787-mercury-mercruiser-thrust-bearing-genuine-quicksilver-oem-part)
> Updated: 2026-05-17