- 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: 6038A7 4931A30 6038A18 4931A10 4814A11
- 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
1643-4517 Mercury Long 20" Lower Unit 2 3 Cyl
1643-4517 Mercury Long 20" 2 3 Cyl lower unit for 1971–1979 outboards, 40 50 60 70 HP. Inspected, serviced, and tested for proper function. Gears are replaced only if bad — good OEM gears are retained. Please note: 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 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. 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).
SPECS
| Driveshaft splines: 11 | Prop shaft splines: 13 |
WHAT WE DID
| ❖ Fully resealed ❖ Pressure checked to 12 PSI ❖ New water pump impeller installed | ❖ Driveshaft and prop shaft checked straight ❖ Professionally cleaned ❖ Opened and inspected |
FITMENT
1643-4517 Mercury Long 20"
| Years | 1971–1979 |
| Shaft | 20" |
| Horsepower | 40 50 60 70 HP |
Verify by model and serial number before purchase to confirm this is the correct unit for your application.
Backed by Southcentral Outboards. Warranty validated by core return — we provide the shipping label. Failures during normal use within the warranty period will be repaired or replaced.
DISCLAIMER
Listing info accurate to the best of our knowledge but not guaranteed. Fitment is the buyer’s responsibility — verify by model and serial before purchase.
SOUTHCENTRAL OUTBOARDS · ALTAMONT, IL
