1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY

 
$325.00
International Shipping Quote
  • Brand: Mercury
  • Size: 35 40 45 50 60 70 HP
  • Color: Black
  • Style: 2 , 3, & 4 Cylinder - 20" - 2-Stroke
  • Condition: Used
  • Notes: Fully Resealed & New Impeller!
  • SKU: 40428 LRU
  • Manufacturer Part Number: 1643-9539
  • Country of Manufacture: United States
  • Motor & Engine Type: Mercury
  • Part Type: Motors, Engines & Components
  • Other Part Number: N/A
  • Surface Finish: Painted, Black
  • Warranty: 30 days
  • Inventory Number: 40428 LRU
  • Website Category: Lower Units
  • Website Sub Category: Complete Lower Units
  • UPC: N/A
  • Shipping: $50.00
Part Number
C# 1643-9539
Additional Info

This specific lower unit is in good condition. It holds pressure and no metal in oil. The shifts spin smoothly and has a new shift rod seal in place. The impeller has also been replaced and we are giving this purchase a 6 MONTH WARRANTY. Please add oil before installation. Purchase with confidence!  

Driveshaft measures - 20" from the top of the water pump to the end of the pin
Driveshaft spline count - 11
Prop shaft spline count - 13

General Information

  • Freshwater condition
  • New Impeller
  • Pressure checked to 12 PSI minimum
  • Shafts checked for straightness
  • No metal in oil
  • Need to add oil before use

Criteria to validate your 6 month warranty:

  • Core must be of equal or greater value
  • 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

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 6 month 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 6 month 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:

35 HP 1984-1989
40 (2 Cylinder) HP 1980-1983
45 (4 Cylinder) HP 1984-1989
50/60/70 HP 1980-1990
40 (4 Cylinder) HP 1989-1997

Please note that this lower unit will NOT fit the following below.
30/40 (2 Cylinder) 1991 & UP

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!

1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY
1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY1643-9539 Mercury 1980-97 20" Lower Unit 35 40 45 50 60+HP 2 3 4 cyl 6 MONTH WTY