2-Piece Exhaust Elbow Gasket Set for OMC Cobra and Volvo Penta 2.5L–3.0L Engines (Replaces 3850495, 908013)
2-Piece Exhaust Elbow Gasket Set for OMC Cobra and Volvo Penta 2.5L–3.0L Engines (Replaces 3850495, 908013) is backordered and will ship as soon as it is back in stock.
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2-Piece Exhaust Elbow Gasket Set for OMC Cobra and Volvo Penta 2.5L...
2-Piece Exhaust Elbow Gasket Set for OMC Cobra and Volvo Penta 2.5L–3.0L Engines (Replaces 3850495, 908013) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Exhaust Elbow Gasket Set provides a dependable seal between the exhaust manifold and the riser or elbow on compatible OMC Cobra and Volvo Penta stern-drive applications. The package contains two gaskets for service or replacement work on compatible 2.5L and 3.0L engines.
These exhaust elbow gaskets are listed for OMC and Volvo Penta applications using the following reference numbers: Volvo Penta 3850495; OMC 0778045, 0908013, 778045, and 908013; Sierra 18-2875, 18-2875-1, and 18-2875-1-9; GLM 33770; and MerCruiser 802376.
- Helps seal the manifold-to-riser or manifold-to-elbow joint.
- Designed as a direct replacement for the listed reference applications.
- Two gaskets included for convenient service and replacement.
Part Number Matrix
Use the following references to compare your existing gasket before ordering. Part-number cross-references should be confirmed against the engine and exhaust components being serviced.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3850495 |
| OMC | 0778045, 0908013, 778045, 908013 |
| Sierra | 18-2875, 18-2875-1, 18-2875-1-9 |
| GLM | 33770 |
| MerCruiser | 802376 |
Engine & Model Compatibility
This gasket set is intended for the exhaust elbow joint on compatible OMC Cobra and Volvo Penta stern-drive or out-drive applications. The company fitment information identifies 2.5L and 3.0L applications rated at approximately 120, 140, and 165 CV/HP.
For the 3.0GS application identified in related manifold service information, the applicable engine is a 181 CID, four-cylinder model from 1993 and later. Always compare the existing gasket, exhaust elbow, engine model, and reference number before installation.
| Brand | Application | Displacement | Rated Output | Reference Numbers | Notes |
|---|---|---|---|---|---|
| OMC | Cobra stern drive / out-drive | 2.5L–3.0L | 120–165 HP | 0778045, 0908013, 778045, 908013 | Exhaust elbow joint application |
| Volvo Penta | Stern drive / out-drive | 2.5L–3.0L | 120–165 HP | 3850495 | Exhaust elbow joint application |
| OMC / Volvo Penta | 3.0GS, four-cylinder | 3.0L / 181 CID | 140 HP class | 3850495, 908013 | Related manifold service application; verify model year and component design |
Technical Specs
- Product Type
- Exhaust elbow gasket
- Quantity
- 2 gaskets
- Installation Location
- Between the exhaust manifold and riser or elbow
- Application
- Compatible OMC Cobra and Volvo Penta stern-drive or out-drive exhaust systems
- Engine Range
- Selected 2.5L and 3.0L applications
- Replacement Type
- Aftermarket direct-replacement gasket set
What’s in the Box
- 2 x Exhaust elbow gasket
Installation Notes
- Allow the engine and exhaust components to cool completely before beginning work.
- Disconnect the battery to prevent accidental starting.
- Close the water intake seacock where applicable and drain water from the exhaust manifold and elbow assembly as required by the service procedure.
- Disconnect any hoses attached to the exhaust elbow or riser.
- Remove the fasteners and separate the elbow or riser from the exhaust manifold.
- Clean both mating surfaces thoroughly. Remove old gasket material, scale, and corrosion without damaging the sealing surfaces.
- Position the new gasket and align all bolt holes.
- Reinstall the elbow or riser and tighten the fasteners in the correct sequence to the engine manufacturer’s specified torque.
- Reconnect the hoses, reopen the seacock where applicable, and reconnect the battery.
- Run the engine and inspect the joint for exhaust or water leaks.
Troubleshooting & FAQ
How do I confirm that this gasket fits my engine?
Compare your existing gasket and engine exhaust arrangement with the listed OMC Cobra or Volvo Penta application. Also compare the reference number, engine displacement, model, and component shape before ordering. The reference numbers most commonly associated with this gasket include 3850495 and 908013.
What are common signs of a failed exhaust elbow gasket?
Possible signs include exhaust or water leakage at the manifold-to-elbow joint, staining or corrosion around the joint, unusual exhaust odor, or engine overheating. An internal water leak can cause serious engine damage, so investigate leaks promptly.
Is this gasket sold individually or as a pair?
This listing contains two exhaust elbow gaskets. Confirm that the quantity and gasket shape match your service requirements before installation.
Can I reuse an old exhaust gasket?
No. Exhaust gaskets should normally be replaced after removal because the original sealing surface may be compressed, damaged, or contaminated.
When should the gasket be replaced?
Replace the gasket whenever the exhaust elbow, riser, or manifold is removed, or whenever leakage or gasket damage is found. There is no universal fixed replacement interval.
Is this an OEM part?
This listing is for an aftermarket replacement gasket set. The reference numbers shown are provided for application and cross-reference purposes.
Safety & Important Info
- Verify the engine model, exhaust configuration, reference number, and gasket shape before purchase.
- Do not rely on horsepower or displacement alone to confirm fitment.
- Use the manufacturer’s service procedure and torque specifications during installation.
- Professional installation is recommended if you are not familiar with marine exhaust-system service.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world operating conditions.
- Application-Focused Support — We emphasize reference-number and engine-application matching to help reduce fitment errors.
- Marine Replacement Value — Practical aftermarket solutions for routine repair and maintenance.
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