- Brand: Mercury
- Size: 40 50 60 HP
- Color: Black
- Style: 2 & 3 Cylinder - Long - 11/13 Splines
- Condition: Used
- Notes: 20" driveshaft- fully resealed
- SKU: 53271 LRU
- Manufacturer Part Number: 1643-6038A18 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: 53271 LRU
- Website Category: Lower Units
- Website Sub Category: Complete Lower Units
- UPC: N/A
- Shipping: $50.00
Mercury 20" Long Lower Unit
Mercury 20" Long lower unit for 1973–1979 outboards, 40 50 60 HP. Inspected, serviced, and tested for proper function. Gears are replaced only if bad — good OEM gears are retained. Please note: Location: Southcentral Outboards, Altamont, Illinois Fits: 1971-1979 - 40 50 60 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 length: 21-7/16″ | |
| Driveshaft splines: 11 | Prop shaft splines: 13 |
Driveshaft length measured from the top of the water pump.
WHAT WE DID
| ❖ Fully resealed ❖ Pressure checked to 12 PSI ❖ New water pump impeller installed | ❖ Driveshaft and prop shaft checked straight ❖ Shifts smoothly through gears |
FITMENT
Mercury 20" Long
| Years | 1973–1979 |
| Shaft | 20" |
| Horsepower | 40 50 60 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
