# 27806871 Mercury MerCruiser 278M0204687 Thermostat gasket | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Thermostat Housing Gasket - Part Number: 27-8M0238323

  

A genuine Quicksilver cork thermostat housing gasket for MerCruiser GM 3.0L, V6 and V8 petrol engines. This gasket supersedes earlier 27-806871 and 27-8M0204687 references and seals the thermostat housing joint in sterndrive and inboard cooling systems.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM thermostat gasket

• Current service reference 27-8M0238323

• Supersedes 27-8M0204687 and earlier 27-806871 references

• Cork-style thermostat housing gasket used across MerCruiser petrol cooling systems

• Suits 3.0L, 4.3L, 4.5L, 5.0L, 5.7L, 6.2L and big block applications where specified

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 27-8M0238323 → Supersedes 27-8M0204687

• 27-8M0204687 → Supersedes 27-806871

• 27-806871 earlier OEM thermostat gasket reference

• 27-47510 / 27-47510Q earlier related thermostat gasket references where specified

  

OEM / Related Numbers:

  

• 27-8M0238323

• 8M0238323

• 27-8M0204687

• 8M0204687

• 27-806871

• 806871

• 27806871

• 27-47510

• 47510

• 27-47510Q

• 47510Q

  

Aftermarket / Verified Equivalents:

  

• Recmar: REC27-47510Q

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser thermostat housing and cooling-system gasket applications

• MerCruiser 3.0L inline 4-cylinder, 4.3L V6, 4.5L V6, 5.0L V8, 5.7L V8, 6.2L V8 and big block V8 engines where 27-8M0238323 / 27-8M0204687 / 27-806871 is specified

  

Typically suits:

  

• Engine models:

• MerCruiser 3.0L GM 181 I/L4 - serial 0L097000 to 0W301999

• MerCruiser 3.0L GM 181 I/L4 - serial 0W302000 to 1A0019999

• MerCruiser 3.0L GM 181 I/L4 - serial 1A002000 to 1A020543

• MerCruiser 3.0L GM 181 I/L4 - serial 1A020544 and up

• MerCruiser 3.0L MPI EC - serial 1A072812 and up

• MerCruiser 350 MAG Ski / EFI / MPI Ski - 1994-1997 where specified

• MerCruiser 454 EFI Ski and 454 MAG MPI Ski - 1995-1997 where specified

• MerCruiser 5.7L Competition Ski / Carb Ski / MPI Ski / Ski EC - serial-numbered applications where specified

• MerCruiser Black Scorpion 350 MAG, Scorpion 350 and Scorpion 377 - serial-numbered applications where specified

• MerCruiser MX 6.2L MPI Ski - serial-numbered applications where specified

• MerCruiser 262 MAG - serial 0F803800 to 0K999999

• MerCruiser 4.3L Gen II / Gen+ 2BBL and 4BBL - 1996-1997 where specified

• MerCruiser 4.3L Carb Alpha / Bravo - serial 0L010044 and up

• MerCruiser 4.3L MPI Alpha / Bravo - serial 0L010044 and up

• MerCruiser 4.5L MPI 200 / 250 Alpha and Bravo - serial 2A441953 and up

• MerCruiser 4.5L MPI 200 / 250 EC Alpha and Bravo - serial 2A441953 and up

• MerCruiser 350 MAG MPI Horizon and 350 MAG MIE - serial-numbered applications where specified

• MerCruiser 454 MAG MPI Horizon - serial-numbered applications where specified

• MerCruiser 5.0L, 5.7L and 6.2L GM V8 Alpha / Bravo / MIE cooling systems where 27-806871 or later reference is specified

  

• Engine Type: MerCruiser GM and Mercury petrol inboard / sterndrive cooling systems

• System Type: Thermostat housing gasket

• Fitment Note: This gasket is matched by thermostat housing style and cooling-system diagram.

  

🔌 Function

  

The thermostat housing gasket seals the thermostat housing joint to prevent water or coolant leakage while maintaining correct cooling flow through the thermostat assembly.

  

Common signs of failure:

  

• Water leak around thermostat housing

• Corrosion or rust staining at the housing joint

• Cooling-system seepage after thermostat service

• Overheating caused by poor housing seal

• Gasket replacement required during thermostat or housing removal

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 12.4 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 12.40 AUD | In stock |

## Images

- 27806871 Mercury MerCruiser 278M0204687 Thermostat gasket | Genuine Quicksilver OEM Part
- 27806871 Mercury MerCruiser 278M0204687 Thermostat gasket | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/27806871-mercury-mercruiser-278m0204687-thermostat-gasket-genuine-quicksilver-oem-part)
> Updated: 2026-05-17