# 8172771 Mercury MerCruiser 278172771  27-430341  Gasket | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Water Pump Top Gasket - Part Number: 27-8172771

  

A genuine Quicksilver water pump gasket used in selected Mercury / Mariner outboard and MerCruiser Alpha One Gen II water pump applications. This gasket seals the top water pump housing area to help maintain correct cooling water pressure through the lower-unit pump assembly.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM water pump gasket

• Correct Mercury part number 27-8172771

• Used in water pump top housing applications

• Fits selected Mercury / Mariner outboards and Alpha One Gen II pump assemblies

• Important replacement gasket during water pump housing or impeller service

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 27-8172771 → Supersedes 27-430341

• 27-430341 earlier OEM gasket reference

• 27-43034-1 earlier formatted OEM reference

  

OEM / Related Numbers:

  

• 27-8172771

• 8172771

• 278172771

• 27-817277-1

• 817277

• 27-430341

• 430341

• 27-43034-1

  

Aftermarket / Verified Equivalents:

  

• Recmar: REC27-8172771

• No additional aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner water pump top gasket applications

• MerCruiser Alpha One Gen II water pump gasket applications

  

Typically suits:

  

• Engine / drive models:

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

• Mercury / Mariner 50HP to 250HP 2-stroke water pump applications where 27-8172771 is specified

• Mercury / Mariner 30HP to 75HP FourStroke water pump applications where 27-8172771 is specified

• Mercury / Mariner 135HP to 275HP Verado water pump applications where 27-8172771 is specified

• Mercury 40 EFI FourStroke lower-unit water pump applications where 27-8172771 is specified

• Mercury 50 EFI FourStroke lower-unit water pump applications where 27-8172771 is specified

• Mercury 60 EFI FourStroke lower-unit water pump applications where 27-8172771 is specified

• Mercury 75 / 90 / 115 FourStroke water pump applications where 27-8172771 is specified

• Mercury 200 / 225 / 250 EFI / DFI water pump applications where 27-8172771 is specified

• Mercury Verado 200 / 225 / 250 / 275 / 300 L6 water pump applications where 27-8172771 is specified

  

• HP Range: 30HP - 300HP where specified, plus Alpha One Gen II sterndrive applications

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

• System Type: Water pump top gasket / pump housing seal

  

🔌 Function

  

The gasket seals the water pump housing joint so the impeller can build correct water pressure without leakage at the pump body.

  

Common signs of failure:

  

• Water pump pressure loss

• Engine overheating after pump service

• Torn or flattened gasket during disassembly

• Leaks around the pump housing joint

• Weak cooling water output despite new impeller

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 10.38 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 10.38 AUD | In stock |

## Images

- 8172771 Mercury MerCruiser 278172771  27-430341  Gasket | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/8172771-mercury-mercruiser-278172771-gasket-genuine-quicksilver-oem-part)
> Updated: 2026-05-27