# 27827284 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Thermostat Cover Gasket - Part Number: 27-827284

  

A genuine Quicksilver thermostat cover gasket for Mercury and Mariner 30HP to 60HP 3-cylinder outboards. This gasket seals the thermostat cover to the cylinder head / cooling passage area and is replaced during thermostat inspection or cooling-system service.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM thermostat cover gasket

• Correct Mercury part number 27-827284

• Used on Mercury / Mariner 30 Jet, 40HP, 40 Jet, 45 Jet, 50HP, 55HP and 60HP 3-cylinder outboards

• Cross-referenced with Sierra and GLM thermostat cover gasket equivalents

• Required replacement gasket during thermostat cover removal

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 27-827284 current OEM service reference

  

OEM / Related Numbers:

  

• 27-827284

• 827284

• 27827284

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-2721

• GLM: 37850

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner 3-cylinder outboard thermostat cover applications

• 30 Jet to 60HP cooling-system thermostat cover assemblies where 27-827284 is specified

  

Typically suits:

  

• Engine models:

• Mercury 30 Jet 3-cylinder - serial 0G590000 to 0G760299

• Mercury 30 Jet 3-cylinder - serial 9973100 to 0P016999

• Mercury 30 Jet 3-cylinder - serial 0G760300 to 0T408999

• Mercury 30 Jet 3-cylinder - serial 0P017000 to 0P153499

• Mercury 40HP 3-cylinder - serial 0G590000 to 0G760299

• Mercury 40HP 3-cylinder - serial 9973100 to 0P016999

• Mercury 40HP 3-cylinder - serial 0G760300 to 0T979999

• Mercury 40HP 3-cylinder - serial 0P017000 to 0P325499

• Mercury 40HP 3-cylinder - serial 0T980000 to 1B209735

• Mercury 40HP 3-cylinder - serial 0P325500 and up

• Mercury 40 Jet - serial 0T178500 to 0T979999

• Mercury 40 Jet - serial 0P094500 to 0P325499

• Mercury 40 Jet - serial 0T980000 and up

• Mercury 40 Jet - serial 0P325500 and up

• Mercury 45 Jet - serial 0G590000 to 0G760299

• Mercury 45 Jet - serial 9973100 to 0P016999

• Mercury 45 Jet - serial 0G760300 to 0T129554

• Mercury 45 Jet - serial 0P017000 to 0P094499

• Mercury 50HP 3-cylinder - serial 0G590000 to 0G760299

• Mercury 50HP 3-cylinder - serial 9973100 to 0P016999

• Mercury 50HP 3-cylinder - serial 0G760300 to 0T979999

• Mercury 50HP 3-cylinder - serial 0P017000 to 0P325499

• Mercury 50HP 3-cylinder - serial 0T980000 and up

• Mercury 50HP 3-cylinder - serial 0P325500 and up

• Mercury 55HP 3-cylinder - serial 0G590000 to 0G760299

• Mercury 55HP 3-cylinder - serial 9973100 to 0P016999

• Mercury 55HP 3-cylinder - serial 0G760300 to 0T979999

• Mercury 55HP 3-cylinder - serial 0P017000 to 0P325499

• Mercury 55HP 3-cylinder - serial 0T980000 and up

• Mercury 55HP 3-cylinder - serial 0P325500 and up

• Mercury 60HP 3-cylinder - serial 0G590000 to 0G760299

• Mercury 60HP 3-cylinder - serial 9973100 to 0P016999

• Mercury 60HP 3-cylinder - serial 0G760300 to 0T979999

• Mercury 60HP 3-cylinder - serial 0P017000 to 0P325499

• Mercury 60HP 3-cylinder - serial 0T980000 and up

• Mercury 60HP 3-cylinder - serial 0P325500 and up

• Mercury 60HP Bigfoot 3-cylinder - serial 0G590000 to 0G760299

• Mercury 60HP Bigfoot 3-cylinder - serial 9973100 to 0P016999

• Mercury 60HP Bigfoot 3-cylinder - serial 0G760300 to 0T979999

• Mercury 60HP Bigfoot 3-cylinder - serial 0P017000 to 0P325499

  

• HP Range: 30 Jet / 40HP - 60HP where specified

• Engine Type: Mercury / Mariner 3-cylinder outboard

• System Type: Thermostat cover gasket

  

🔌 Function

  

The thermostat cover gasket seals the thermostat cover joint, preventing cooling-water leakage and helping the thermostat regulate operating temperature correctly.

  

Common signs of failure:

  

• Water leak around thermostat cover

• Salt build-up near cover joint

• Overheating from poor thermostat sealing

• Gasket tearing during thermostat service

• Replacement required after thermostat cover removal

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 6.2 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 6.20 AUD | In stock |

## Images

- 27827284 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/27827284-mercury-mercruiser-gasket-genuine-quicksilver-oem-part)
> Updated: 2026-05-17