# 27-43006 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Thermostat Cover Gasket - Part Number: 27-430068

  

A genuine Quicksilver thermostat-cover gasket for selected Mercury and Mariner two-stroke outboards.

  

The gasket seals the thermostat cover or cooling-water cover to the cylinder head, preventing water leakage and ensuring cooling flow passes through the thermostat and intended cylinder-head passages.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM thermostat-cover gasket

• Mercury 27-43006 gasket-family reference

• Used on selected small two-stroke and 70HP to 125HP outboards

• Sierra and NAPA replacements available

• Replace whenever the thermostat cover is removed

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 27-430068 current formatted gasket reference

• 27-430063 earlier gasket reference

• 27-430062 earlier gasket reference

• 27-430061 earlier gasket reference

• 27-43006 original OEM gasket-family reference

  

OEM / Related Numbers:

  

• 27-430068

• 430068

• 27-430063

• 27-430062

• 27-430061

• 27-43006

• 43006

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-0339

• NAPA Marine: SME180339

• PartsDepot: 27-430068 replacement gasket

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury and Mariner thermostat-cover and cylinder-head cooling assemblies

  

Typically suits:

  

• Engine models:

• Mercury / Mariner 6HP two-stroke applications using the 43006 gasket family

• Mercury / Mariner 8HP two-stroke

• Mercury / Mariner 9.9HP and 10HP two-stroke

• Mercury / Mariner 15HP two-stroke

• Mercury 70HP 3-cylinder

• Mercury 75HP 3-cylinder

• Mercury 80HP 3-cylinder

• Mercury 90HP 3-cylinder

• Mercury 100HP 4-cylinder

• Mercury 115HP 4-cylinder

• Mercury 125HP 4-cylinder

• International 3-cylinder and 4-cylinder applications from serial 9483121 and above where the 43006 gasket family is specified

  

• HP Range: Selected 6HP - 15HP and 70HP - 125HP applications

• Engine Type: Mercury / Mariner two-stroke outboard

• System Type: Thermostat or cooling-water cover gasket

  

🔌 Function

  

The gasket seals the thermostat-cover joint so cooling water remains within the designed cylinder-head passages.

  

Common signs of failure:

  

• Water leaking around the thermostat cover

• Salt deposits at the gasket joint

• Engine temperature becomes unstable

• Gasket tears during cover removal

• Cover will not seal after thermostat service

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 15.68 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 15.68 AUD | In stock |

## Images

- 27-43006 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/27-43006-mercury-mercruiser-gasket-genuine-quicksilver-oem-part)
> Updated: 2026-07-18