• 27806871 Mercury MerCruiser 278M0204687 Thermostat gasket | Genuine Quicksilver OEM Part
  • 27806871 Mercury MerCruiser 278M0204687 Thermostat gasket | Genuine Quicksilver OEM Part - photo 2 of 2
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27806871 Mercury MerCruiser 278M0204687 Thermostat gasket | Genuine Quicksilver OEM Part

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

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$12.40 AUD
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🔧 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

🚤 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

🔄 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

📦 Condition

  • Genuine Quicksilver part
  • Brand new
  • Supplied in original or equivalent packaging

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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