• 478M0204712 Mercury MerCruiser Impeller | Genuine Quicksilver OEM Part
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478M0204712 Mercury MerCruiser Impeller | Genuine Quicksilver OEM Part

478M0204712 Mercury MerCruiser Impeller | Genuine Quicksilver OEM Part

$58.15 AUD
$58.15 AUD
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✓ Authorised Volvo Penta Dealer · Marine & auto specialists · Ships Australia-wide

🔧 Product Description

Genuine Quicksilver Water Pump Impeller - Part Number: 47-8M0204712

Genuine Quicksilver/Mercury water pump impeller for selected Mercury and Mariner 15HP-25HP outboard lower-unit water pump applications. This OEM impeller replaces earlier 85089-series Mercury impeller references and helps restore proper cooling-water flow through the gearcase pump.

⚙️ Key Features

  • Genuine Quicksilver/Mercury OEM water pump impeller
  • Designed for selected Mercury / Mariner 15HP-25HP outboards
  • Direct replacement for earlier 85089-series impeller references
  • Used in compatible lower-unit water pump assemblies
  • Helps restore tell-tale flow, cooling-water pressure and pump priming

🚤 Compatibility

Commonly used on

  • Mercury / Mariner 15HP-25HP outboard lower-unit water pump assemblies
  • Small-to-mid Mercury / Mariner outboard gearcase cooling systems using the 85089-series impeller

Typically suits

  • Engine models:
  • Mercury / Mariner 15HP 2-Stroke outboard applications using 85089-series water pump impeller
  • Mercury / Mariner 18HP 2-Stroke outboard applications using 85089-series water pump impeller
  • Mercury / Mariner 20HP 2-Stroke outboard applications using 85089-series water pump impeller
  • Mercury / Mariner 25HP 2-Stroke outboard applications using 85089-series water pump impeller
  • Mercury / Mariner 15HP-25HP small outboard gearcase applications where the parts diagram specifies 47-8M0204712
  • Mercury / Mariner 15HP-25HP service applications replacing 47-85089, 47-850891, 47-8508910, 47-8508920, 47-850893, 47-8M0024502 or 47-8M0027792
  • HP Range: 15HP - 25HP
  • Engine Type: Mercury / Mariner outboard lower-unit water pump system
  • Year Range: Application dependent by model and serial number; confirm against the gearcase water pump parts diagram when replacing earlier 85089-series impellers

🔌 Function

The impeller draws water through the lower unit and pushes it into the engine cooling system. A correct impeller helps maintain water pressure, reduces overheating risk and supports reliable cooling at idle, low speed and operating RPM.

⚠️ Common Signs of Failure

  • Weak or inconsistent tell-tale water stream
  • Engine overheating warning
  • Pump not priming after service
  • Cracked, stiff or missing impeller vanes
  • Reduced cooling-water pressure
  • Rubber fragments found in the cooling system

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 47-8M0204712 → Supersedes 47-8M0027792
  • 47-8M0027792 → Supersedes 47-8M0024502
  • 47-8M0024502 → Supersedes 47-850893
  • 47-850893 → Supersedes 47-8508920
  • 47-8508920 → Supersedes 47-8508910
  • 47-8508910 → Supersedes 47-850891
  • 47-850891 → Supersedes 47-85089
  • 47-85089 earlier OEM reference

OEM / Related Numbers

  • 47-8M0204712
  • 8M0204712
  • 478M0204712
  • 47-8M0027792
  • 8M0027792
  • 47-8M0024502
  • 8M0024502
  • 47-850893
  • 850893
  • 47-8508920
  • 8508920
  • 47-8508910
  • 8508910
  • 47-850891
  • 850891
  • 47-85089
  • 85089

Aftermarket / Verified Equivalents

  • REC: REC47-85089
  • Sierra: 18-3099 where matched by pump dimensions and application
  • Mallory: 9-45310 where matched by pump dimensions and application

📦 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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