# 3135988A12 Mercury MerCruiser Bearing | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Roller Bearing Assembly - Part Number: 31-35988A12

  

A genuine Quicksilver roller bearing assembly used in MerCruiser R / MR / Alpha One and Alpha One Gen II sterndrive applications. This bearing assembly supersedes earlier 31-35988A2 and is used in selected transom assembly and sterndrive bearing locations.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM bearing assembly

• Correct Mercury part number 31-35988A12

• Supersedes 31-35988A2

• Used on MerCruiser R / MR / Alpha One and Alpha One Gen II applications

• Drive / transom bearing assembly for specified MerCruiser sterndrive diagrams

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 31-35988A12 → Supersedes 31-35988A2

• 31-35988A2 earlier OEM bearing assembly reference

  

OEM / Related Numbers:

  

• 31-35988A12

• 35988A12

• 3135988A12

• 31-35988A2

• 35988A2

  

Aftermarket / Verified Equivalents:

  

• No direct aftermarket equivalent confirmed for all OEM applications

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser R / MR / Alpha One sterndrive applications

• MerCruiser Alpha One Gen II sterndrive and transom assembly applications

  

Typically suits:

  

• Drive / transom models:

• MerCruiser R / MR / Alpha One transom assembly - 1983-1990

• MerCruiser R / MR / Alpha One sterndrive - 1983-1990

• MerCruiser Alpha One Gen II sterndrive and transom assembly - 1991-1995

• MerCruiser Alpha One Gen II sterndrive and transom assembly - 1996-1997

• MerCruiser Alpha One Gen II bearing assembly applications where 31-35988A12 is specified

  

• Drive Type: MerCruiser R / MR / Alpha One / Alpha One Gen II

• System Type: Roller bearing assembly / sterndrive or transom assembly bearing location

  

🔌 Function

  

The bearing assembly supports rotating drive components and helps maintain shaft alignment within the specified MerCruiser sterndrive or transom assembly.

  

Common signs of failure:

  

• Bearing noise from drive assembly

• Rough rotation during inspection

• Metal particles in lubricant

• Excessive shaft movement

• Bearing replacement required during drive rebuild

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 212.85 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 212.85 AUD | In stock |

## Images

- 3135988A12 Mercury MerCruiser Bearing | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/3135988a12-mercury-mercruiser-bearing-genuine-quicksilver-oem-part)
> Updated: 2026-05-30