• 6h3-45300-1a-8d Yamaha gearbox - 20 inch | Genuine Used Part
1 1

6h3-45300-1a-8d Yamaha gearbox - 20 inch | Genuine Used Part

6h3-45300-1a-8d Yamaha gearbox - 20 inch | Genuine Used Part

$850.00 AUD
$850.00 AUD
Sale Sold out
Shipping calculated at checkout.

Out of stock

✓ Authorised Volvo Penta Dealer · Genuine used marine parts · Ships Australia-wide

🔧 Product Description

Genuine Yamaha 20-Inch Lower Unit - Part Number: 6H3-45300-1A-8D

A genuine used Yamaha complete long-shaft gearbox for 60HP and 70HP two-stroke outboards, with selected related 50HP applications. The 6H3-45300-1A-8D assembly belongs to Yamaha's durable mid-range three-cylinder lower-unit family and is superseded in service catalogues by 6H3-45300-19-8D.

⚙️ Key Features

  • Genuine Yamaha complete lower-unit assembly
  • Original part number 6H3-45300-1A-8D
  • 20-inch long-shaft configuration
  • Used primarily on 60HP and 70HP two-strokes
  • Current related service assembly 6H3-45300-19-8D

🚤 Compatibility

Commonly used on

  • Yamaha 60F, P60 and 70B two-stroke engines
  • Yamaha 60FETO / 60TLR / 70BETO / 70TLR
  • Selected 50HP three-cylinder models using the 6H3 lower-unit family

Typically suits

  • Confirmed diagrams include 1986-1993 60HP and 70HP engines
  • Later 60TLR and 70TLR engines continue to use related 6H3 units
  • Regional production may extend into the late 2000s
  • Verify gear ratio and shift-shaft height because several 6H3 revisions exist
  • HP Range: Approximately 50HP - 70HP
  • Shaft Length: 20 inches / L
  • Gear Ratio: Model-dependent; commonly around 2.33:1 in this family
  • Rotation: Standard right-hand
  • Fitment Requirement: Confirm complete service number, driveshaft length and propeller-shaft spline

🔌 Function

The lower unit reduces engine speed to the propeller, provides forward-neutral-reverse selection and houses the cooling-water pump.

⚠️ Common Signs of Failure

  • Gear noise or rough rotation
  • Water entering the gear oil
  • Worn clutch dog or shift cam
  • Bent driveshaft or propeller shaft
  • Broken skeg or corroded housing

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 6H3-45300-19-8D supersedes 6H3-45300-1A-8D
  • The 19-8D service unit also consolidates earlier 10-EK through 19-4D revisions
  • Later 6H3-45300-20-8D units may suit selected engines but require diagram confirmation

OEM / Related Numbers

  • 6H3-45300-1A-8D
  • 6H3453001A8D
  • 6H3-45300-19-8D
  • 6H3-45300-19-4D
  • 6H3-45300-15-4D
  • 6H3-45300-14-4D
  • 6H3-W0001-22 / 6H3-W0001-C1 seal-kit family
  • 6H3-W0078-01 water-pump repair kit

Aftermarket / Verified Equivalents

  • New aftermarket 6H3-45300-20-8D-pattern 60HP-70HP long-shaft lower units
  • Professionally remanufactured Yamaha 60HP / 70HP gearcases
  • Sierra 18-3069 or equivalent impeller replacing 6H3-44352-00
  • Aftermarket 6H3 seal, bearing and gear sets
  • Replacement skegs, skeg guards and propeller-shaft seals

📦 Condition

  • Genuine used part
  • Removed from running engine or vessel 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.

View full details