• 863404T Mercruiser Water Pump Pulley | Genuine Used Part
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863404T Mercruiser Water Pump Pulley | Genuine Used Part

863404T Mercruiser Water Pump Pulley | Genuine Used Part

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$60.00 AUD
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🔧 Product Description

Genuine MerCruiser Circulating Water Pump Pulley - Part Number: 863404T

A genuine used MerCruiser water-pump pulley for selected GM-based petrol marine engines equipped with a serpentine accessory belt and power steering.

The pulley mounts to the engine circulating-water pump and transfers crankshaft rotation through the serpentine belt to circulate coolant through the engine.

⚙️ Key Features

  • Genuine used MerCruiser OEM water-pump pulley
  • Correct current part number 863404T
  • Supersedes earlier pulley 863404
  • Serpentine-belt pulley for power-steering engine packages
  • Factory diameter and groove profile for correct pump speed

🚤 Compatibility

Commonly used on

  • MerCruiser GM V6 and small-block V8 circulating-water pumps
  • Serpentine accessory drives equipped with power steering

Typically suits

  • Engine models:
  • MerCruiser 4.3L V6 with power steering
  • MerCruiser 4.3L MPI Alpha and Bravo
  • MerCruiser 5.0L carburetted V8
  • MerCruiser 5.0L MPI Alpha and Bravo
  • MerCruiser 5.7L V8
  • MerCruiser 350 MAG
  • MerCruiser 350 MAG MPI
  • MerCruiser 350 MAG Horizon
  • MerCruiser 6.2L MPI
  • MerCruiser 377 MAG MPI
  • Engine accessory diagrams specifying pulley 863404 or 863404T
  • Engine Type: MerCruiser GM V6 and small-block V8 petrol sterndrive / inboard
  • Year Range: Approximately late 1990s through the 2000s
  • System Type: Circulating-water pump and serpentine accessory drive

🔌 Function

The pulley drives the circulating-water pump at the designed speed so coolant moves through the cylinder block, heads, thermostat housing and heat exchanger or exhaust system.

⚠️ Common Signs of Failure

  • Pulley is bent or runs out of true
  • Serpentine belt repeatedly comes off
  • Pulley grooves are damaged or worn
  • Mounting holes are elongated
  • Rust or corrosion weakens the pulley
  • Water-pump bearing is overloaded by pulley misalignment

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 863404T → Supersedes 863404
  • 863404 earlier OEM water-pump pulley reference

OEM / Related Numbers

  • 863404T
  • 863404
  • 863404-1
  • 745061568754
  • 862083 related idler assembly
  • 807757T related idler pulley

Aftermarket / Verified Equivalents

  • No aftermarket equivalent

📦 Condition

  • Genuine used part
  • Removed from running engine where applicable
  • In good working condition unless otherwise stated

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 the condition you received it for a refund or exchange. 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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