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, designed for select GM-based 4.3L V6, 5.0L V8, and 5.7L V8 marine engine applications using compatible Volvo Penta SX or OMC Cobra sterndrives.
This engine coupler mounts between the engine flywheel and sterndrive input shaft, transferring engine power to the drive while the rubber isolator helps absorb vibration and drivetrain shock.
The coupler features a 17-spline center hub and factory-style mounting configuration. Common interchange/reference numbers associated with this application 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
- Rubber Isolator Design
- Flywheel-Mounted Configuration
- Select 4.3L V6 Applications
- Select 5.0L V8 Applications
- Select 5.7L V8 Applications
- Select Volvo Penta SX Applications
- Select OMC Cobra Applications
- OEM Replacement / Restoration Component
- Sold Exactly as Pictured
Condition
Good overall used OEM condition with normal cosmetic wear consistent with previous marine use.
The coupler may show normal scratches, scuffs, surface oxidation, staining, rubber aging, and mounting marks from previous installation and removal.
Because this is a used drivetrain component, the rubber isolator, internal splines, mounting holes, hub, and surrounding metal components should be carefully inspected before installation.
Please review all photos carefully for the exact condition and components included.
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 engine and drive families.
Buyer should verify compatibility using Part Number 3858437, 17-spline configuration, engine model, flywheel configuration, sterndrive model, dimensions, and engine/drive serial numbers before purchasing.
Dealer Sale – Sunset Marine TX LLC