OEM Volvo Penta Engine Drive Coupler 3858437 17-Spline 4.3L 5.0L 5.7L SX Cobra
Genuine OEM Volvo Penta rubber engine drive coupler, Part Number 3858437, for select GM-based 4.3L V6, 5.0L V8, and 5.7L V8 marine engine applications equipped with compatible Volvo Penta SX or OMC Cobra sterndrives.
This engine coupler features a 17-spline center hub and flywheel mounting flange and is designed to mount between the engine flywheel and sterndrive input shaft on compatible applications.
Common interchange/reference numbers include 3858437-1, 3853917, 984290, and 986120, with Sierra 18-21752-1 commonly referenced as an aftermarket replacement.
Highlights
- Genuine OEM Volvo Penta
- Engine / Drive Coupler
- Part Number 3858437
- 17-Spline Center Hub
- Flywheel Mounting Flange
- Rubber Isolator Design
- Select 4.3L V6 Applications
- Select 5.0L V8 Applications
- Select 5.7L V8 Applications
- Select Volvo Penta SX Applications
- Select OMC Cobra Applications
- Interchange / Reference Numbers: 3858437-1, 3853917, 984290, 986120
- Sierra Replacement Reference: 18-21752-1
- OEM Replacement / Restoration Component
- Sold Exactly as Pictured
Condition
Used OEM condition with normal signs of previous marine use.
The coupler shows surface rust, oxidation, paint loss, grease residue, staining, scratches, scuffs, and other cosmetic wear consistent with previous installation, removal, and storage.
The mounting flange and internal splines appear complete, with no obvious cracks or major structural damage visible in the metal components. Normal age and wear are present on the rubber isolator.
Because this is a used drivetrain component, the rubber isolator, internal splines, mounting flange, and mounting holes should be carefully inspected before installation.
Please review all photos carefully for the exact condition.
Specifications
Manufacturer: Volvo Penta
Part Type: Engine / Drive Coupler
Part Number: 3858437
Spline Count: 17
Engine Family: GM-Based Marine Engines
Engine Applications: Select 4.3L V6 / 5.0L V8 / 5.7L V8
Drive Applications: Select Volvo Penta SX / OMC Cobra
Interchange / Reference Numbers: 3858437-1, 3853917, 984290, 986120
Aftermarket Reference: Sierra 18-21752-1
Condition: Used OEM
Fitment
Intended for select Volvo Penta and OMC marine engine/sterndrive combinations.
Multiple coupler, flywheel, and input-shaft configurations were used across these applications. Buyer should verify compatibility using Part Number 3858437, 17-spline configuration, engine model, flywheel configuration, mounting pattern, sterndrive model, and engine/drive serial numbers before purchasing.
Dealer Sale – Sunset Marine TX LLC
SKU: 10739