• 27803508 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part
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27803508 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

27803508 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

$30.65 AUD
$30.65 AUD
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✓ Authorised Volvo Penta Dealer · Marine & auto specialists · Ships Australia-wide

🔧 Product Description

Genuine Quicksilver Cylinder Head Gasket - Part Number: 27-803508

A genuine Quicksilver cylinder head gasket for Mercury / Mariner 4HP, 5HP and 6HP four-stroke outboards. This gasket seals the cylinder head to the block and is replaced during cylinder head removal, top-end inspection or engine resealing.

⚙️ Key Features

  • Genuine Quicksilver OEM cylinder head gasket
  • Correct Mercury part number 27-803508
  • Used on Mercury / Mariner 4HP, 5HP and 6HP four-stroke outboards
  • Also cross-referenced with Tohatsu / Nissan small outboard gasket reference 3H6-01005-1
  • Required replacement gasket when the cylinder head is removed

🚤 Compatibility

Commonly used on

  • Mercury / Mariner 4-stroke small outboard cylinder head gasket applications
  • 4HP, 5HP and 6HP cylinder block / cylinder head assemblies where 27-803508 is specified

Typically suits

  • Engine models:
  • Mercury 4HP 4-stroke - serial 0P073456 to 0P400999
  • Mercury 4HP 4-stroke - serial 0P401000 to 0R411837
  • Mercury 4HP 4-stroke - serial 0R000001 to 0R067089
  • Mercury 4HP 4-stroke - serial 0R067090 to 0R411837
  • Mercury 4HP 4-stroke - serial 0R411838 and up
  • Mercury 5HP 4-stroke - serial 0P073456 to 0P400999
  • Mercury 5HP 4-stroke - serial 0P401000 to 0R411837
  • Mercury 5HP 4-stroke - serial 0R000001 to 0R067089
  • Mercury 5HP 4-stroke - serial 0R067090 to 0R411837
  • Mercury 5HP 4-stroke - serial 0R411838 and up
  • Mercury 5HP 4-stroke JCI - serial 0R560794 and up
  • Mercury 5HP Propane - serial 0R936270 and up
  • Mercury 6HP 4-stroke - serial 0P073456 to 0P400999
  • Mercury 6HP 4-stroke - serial 0P401000 to 0R411837
  • Mercury 6HP 4-stroke - serial 0R000001 to 0R067089
  • Mercury 6HP 4-stroke - serial 0R067090 to 0R411837
  • Mercury 6HP 4-stroke - serial 0R411838 and up
  • HP Range: 4HP - 6HP
  • Engine Type: Mercury / Mariner single-cylinder four-stroke outboard
  • System Type: Cylinder head to block gasket

🔌 Function

The cylinder head gasket seals combustion pressure, cooling passages and oil-return areas between the cylinder head and engine block.

⚠️ Common Signs of Failure

  • Compression loss
  • Overheating
  • Water or oil contamination
  • Poor starting or rough running
  • Gasket replacement required after cylinder head removal

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 27-803508 current OEM service reference

OEM / Related Numbers

  • 27-803508
  • 803508
  • 27803508

Aftermarket / Verified Equivalents

  • Tohatsu / Nissan: 3H6-01005-1

📦 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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