# 430331 Mercury MerCruiser 27430331 Gasket | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Gear Housing / Water Pump Base Gasket - Part Number: 27-430331

  

A genuine Quicksilver gear housing gasket used on selected MerCruiser Alpha One Gen II sterndrives and a wide range of Mercury / Mariner outboard water pump base and gear housing applications. This gasket seals the water pump base / gear housing joint to help maintain correct cooling water pressure.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM gear housing gasket

• Correct Mercury part number 27-430331

• Used on MerCruiser Alpha One Gen II and selected Mercury / Mariner outboards

• Suitable for water pump base and gear housing sealing applications

• Helps prevent water pressure loss and lower-unit cooling system leaks

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 27-430331 current OEM service reference

  

OEM / Related Numbers:

  

• 27-430331

• 430331

• 27430331

• 27-43033-1

• 43033

• 19234-ZW1-003 related cross-reference

• 9-60020 related cross-reference

• 30090 related cross-reference

  

Aftermarket / Verified Equivalents:

  

• Mallory: 9-60020

• No additional aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser Alpha One Gen II water pump / gear housing gasket applications

• Mercury / Mariner outboard water pump base gasket applications

  

Typically suits:

  

• Drive / engine models:

• MerCruiser Alpha One Gen II sterndrive - serial 0D469859 and up

• Mercury / Mariner 40HP - 60HP 4-Stroke BigFoot outboards

• Mercury / Mariner 60HP 3-cylinder BigFoot outboards

• Mercury / Mariner 75HP - 115HP 2-stroke outboards - USA serial 0A996142 and up

• Mercury / Mariner 75HP - 115HP 2-stroke outboards - Belgium serial 9483121 and up

• Mercury / Mariner 75HP EFI 4-Stroke outboards

• Mercury / Mariner 80HP EFI 4-Stroke outboards

• Mercury / Mariner 90HP EFI 4-Stroke outboards

• Mercury / Mariner 100HP EFI 4-Stroke outboards

• Mercury / Mariner 115HP EFI 4-Stroke outboards

• Mercury / Mariner 150HP EFI 4-Stroke outboards

• Mercury V-200 3.0L DFI outboard applications

• Mercury / Mariner V-225 3.0L outboard applications

• Mercury / Mariner V-250 3.0L outboard applications

• Mercury Verado 135HP applications

• Mercury Verado 150HP applications

• Mercury Verado 175HP applications

• Mercury Verado 200HP applications

• Mercury Verado 225HP applications

• Mercury Verado 250HP applications

• Mercury Verado 275HP applications

• Mercury Verado 300HP applications

  

• HP Range: 40HP - 300HP where specified

• Engine / Drive Type: MerCruiser Alpha One Gen II sterndrive and Mercury / Mariner outboard

• System Type: Water pump base / gear housing gasket

  

🔌 Function

  

The gasket seals the water pump base and gear housing joint so the pump can build correct cooling water pressure without leakage at the base.

  

Common signs of failure:

  

• Weak tell-tale or reduced water pressure

• Water leakage at the water pump base

• Engine overheating after pump service

• Gasket tearing during pump disassembly

• Poor cooling performance despite a new impeller

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 13.18 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 13.18 AUD | In stock |

## Images

- 430331 Mercury MerCruiser 27430331 Gasket | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/430331-mercury-mercruiser-27430331-gasket-genuine-quicksilver-oem-part)
> Updated: 2026-05-17