1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY

 
$450.00
International Shipping Quote
  • Brand: Mercury
  • Size: 40 50 60 70 HP
  • Color: Black
  • Style: 2 & 3 Cylinder
  • Condition: Used
  • Notes: Freshwater - Inspected & Tested
  • SKU: 31000 LRU
  • Manufacturer Part Number: 1643-4517
  • Country of Manufacture: United States
  • Motor & Engine Type: Mercury
  • Part Type: Motors, Engines & Components
  • Other Part Number: N/A
  • Surface Finish: Painted, Black
  • Inventory Number: 31000 LRU
  • Website Category: Lower Units
  • Website Sub Category: Complete Lower Units
  • UPC: N/A
  • Shipping: $50.00
Part Number C# 1643-4517
Additional Info
This lower unit is in great condition. The driveshaft measures 17-3/4 inches from the top of the water pump to the end of the pin. The 13 splines on the propeller shaft and the 11 splines on the driveshaft and all in excellent condition. There are some cosmetic flaws such as scuffs and scratches in the paint and housing, but this will not affect any performance aspect of this lower unit.  The gears on the inside are in excellent condition. As seen in the pictures, this does not come with the trim tab. The paint on skeg is worn some and it does have minor dings around the edges, with a small bend to it, but nothing that will affect the performance. Purchase with confidence! Please remember to add oil before use. 

General Information

  • Freshwater condition
  • Opened & Inspected
  • Professionally Cleaned
  • New Impeller
  • Pressure checked to 12 PSI minimum
  • Fully Resealed
  • Shafts checked for straightness

To obtain the 1 year warranty, you MUST send in your core lower unit. We will even pay to have your core shipped to us! Below is the criteria required to validate the warranty:

  • Core must be of rebuildable quality
  • Cannot be locked up - driveshaft must spin
  • Up to 30 days from the date of purchase to send in your core
  • Covers mechanical aspects ONLY
  • Warranty begins from date of purchase
  • Core must be complete and cannot be missing any parts

You will receive two copies of the terms and conditions for the lower unit one year warranty. One copy MUST be signed and returned with your core. Without a returned signed copy, the one year warranty will not be valid. 

Upon receipt of your core, we will inspect the unit to determine if it meets the criteria to validate the 1 year warranty. We reserve the right to accept or reject any core at our discretion. If you have any questions or concerns, please do not hesitate to contact us and we would be happy to help! 
Fits:
1971-1979 - 40 50 60 70 HP 2 & 3 Cylinder

This unit interchangeable with 1980-1986 and 1987-1997 models but different housing on this one (rounded cavitation plate on this one). This will not fit the 65hp 3 cylinder engine.

We have provided this cross-reference with the resources we have available in regards to fitment. This most likely will not fit every model for the years and horsepowers we have listed. We urge you to make sure this is the exact item you need by matching the part number to what is required for your motor. If you need help doing so, please contact us prior to purchasing and we would be happy to help!  
1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY
1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY1643-4517 Mercury 1971-79 Long 20" Lower Unit 40 50 60 70 HP 2 3 Cyl 1 YEAR WTY