• 804142T Mercury Gear | Genuine Used Part
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804142T Mercury Gear | Genuine Used Part

804142T Mercury Gear | Genuine Used Part

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🔧 Product Description

Genuine Mercury 75HP-115HP Four-Stroke Oil Pump Driven Gear - Part Number: 43-804142T

A genuine Mercury driven gear used in the oil-pump assembly of selected Yamaha-manufactured Mercury four-stroke outboards.

Mercury catalogues identify the service number as 43-804142T. The gear works with drive gear 43-804151T01 to operate the engine lubrication pump.

⚙️ Key Features

  • Genuine Mercury oil-pump driven gear
  • Correct part number 43-804142T / 804142T
  • Used on Yamaha-built Mercury inline-four engines
  • Factory gear profile and bore
  • Works with drive gear 43-804151T01
  • Discontinued or limited-supply OEM component

🚤 Compatibility

Documented on selected

  • Mercury 75HP carburetted four-stroke - serial 0G960500-1B226999
  • Mercury 75HP EFI four-stroke - serial 1B172291-1B366822
  • Mercury 80HP EFI four-stroke - serial 1B227000-1B366822
  • Mercury 90HP carburetted four-stroke - serial 0G960500-1B226999
  • Mercury 90HP EFI four-stroke - serial 1B172291-1B366822
  • Mercury 100HP EFI four-stroke - serial 1B227000-1B366822
  • Mercury 115HP EFI four-stroke - serial 0T178500-1B366822
  • Specifically documented on 115 EFI serial groups 0T178500-0T800999 and 1B227000-1B366822
  • Engine Type: Yamaha-manufactured Mercury inline-four four-stroke outboard
  • HP Range: 75HP-115HP
  • Fitment Requirement: Confirm the oil-pump diagram and engine serial number

🔌 Function

The gear transfers mechanical rotation to the engine oil pump so pressurised lubricant circulates through the crankshaft, camshaft and bearing galleries.

⚠️ Common Signs of Failure

  • Oil pressure is low
  • Gear teeth are damaged
  • Oil pump does not rotate
  • Abnormal gear noise occurs
  • Debris appears in the engine oil
  • Gear has excessive shaft clearance

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 43-804142T current documented driven-gear reference
  • No direct supersession confirmed

OEM / Related Numbers

  • 43-804142T
  • 804142T
  • 43-804151T01 related drive gear
  • Related oil-pump assembly, shaft and retaining hardware
  • Related Yamaha-manufactured powerhead components

Aftermarket / Verified Equivalents

  • Specialist used or new-old-stock 804142T gear
  • Used complete Mercury 75HP-115HP oil-pump assembly
  • A Yamaha platform equivalent may exist, but no verified direct Yamaha service number was confirmed
  • No verified direct aftermarket gear

📦 Condition

  • Genuine used part
  • Removed from running engine where applicable
  • In good working condition unless otherwise stated
  • Inspect gear teeth and mating drive gear before installation

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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