Exhaust Elbow Gasket – Fits OMC Stern Drive & Volvo Penta 2.5L-3.0L (Replaces 3850495, 908013)
Exhaust Elbow Gasket – Fits OMC Stern Drive & Volvo Penta 2.5L-3.0L (Replaces 3850495, 908013) is backordered and will ship as soon as it is back in stock.
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Exhaust Elbow Gasket – Fits OMC Stern Drive & Volvo Penta 2.5L-...
Product Details
This high-quality Exhaust Elbow Gasket ensures a perfect seal between the exhaust manifold and the riser or elbow on various marine engines. It is designed for OMC Stern Drive 2.5L–3.0L models (1973–1990) and Volvo Penta 3.0L engines (1993–2010), including GS, GL, GLM, GLP, GSM, and GSP series.
This part serves as a direct interchange for multiple OEM and aftermarket part numbers, including OMC 908013, Volvo Penta 3850495, Sierra 18-2875, and Mallory 9-65100, among others.
- Designed for a direct, bolt-on installation.
- Made from durable composite fiber material for marine environments.
- Package includes two gaskets for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 908013 |
| OMC | 3850495 |
| Volvo Penta | 3850495 |
| Sierra | 18-2875 |
| GLM | 33770 |
| Mallory | 9-42800 |
| Mallory | 9-65100 |
| Barr | OMC47908013 |
| INDMAR | 01-0107 |
| Osco | 0188-G |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits a wide range of 4-stroke OMC Stern Drive models from 1973–1990, including various horsepower ratings and the 3.0L Cobra.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC | Stern Drive | 100 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 120 | 4-Stroke | 1981–1986 | 908013, 33770 | 153 CID / 2.5L GM |
| OMC | Stern Drive | 140 | 4-Stroke | 1973–1990 | 908013, 33770 | 181 CID / 3.0L GM |
| OMC | Stern Drive | 155 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 165 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 170 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 175 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 185 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 190 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 200 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 225 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 230 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 235 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 240 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 245 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 250 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Stern Drive | 260 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Cobra | 3.0L | 4-Stroke | 1981–1990 | 908013, 33770 | |
| OMC | Inboard | 305 | 4-Stroke | 1973–1990 | 908013, 33770 | |
| OMC | Inboard | 350 | 4-Stroke | 1973–1990 | 908013, 33770 |
Compatible with Volvo Penta 3.0L engines from 1993–2010 across the GS, GL, GLM, GLP, GSM, and GSP series.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Volvo Penta | 3.0L GS | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GL | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GLMMDA | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSMBYMCE | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSMLKD | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSMNCS | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSMWTR | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSPBYMCE | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSPEFS | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSPLKD | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSPMDA | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSPNCS | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSPWTR | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GLM-A/B/C | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GLP-A/B/C/D/E/J/N | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSM-A/B/C | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
| Volvo Penta | 3.0L GSP-A/B/C | 135-150 | 4-Stroke | 1993–2010 | 3850495 |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Installation
- Direct replacement, bolt-on
- Connection
- Exhaust manifold to riser/elbow
- Package Quantity
- 2 pieces per package
- Material
- Composite fiber material
- Application
- Marine stern drive engines
- Fitting Type
- Bolt-on, direct replacement
What’s in the Box
- 2 x Exhaust Elbow Gasket (Replaces 3850495/908013)
Installation Notes
- Ensure the engine is completely cool before beginning work. Disconnect the battery for safety.
- Locate the exhaust manifold and riser/elbow connection. Carefully remove any hoses or components blocking access.
- Unbolt the riser/elbow from the manifold. You may need a breaker bar for stubborn bolts. Keep track of all hardware.
- Carefully separate the two components and remove the old gasket. Note its orientation.
- Thoroughly clean both mating surfaces. Use a gasket scraper and a suitable solvent to remove all old gasket material and corrosion. The surfaces must be completely clean and flat.
- Position the new gasket, ensuring it aligns perfectly with the bolt holes and exhaust passages.
- Re-attach the riser/elbow to the manifold. Hand-tighten the bolts first, then torque them to the manufacturer's specified value and sequence.
- Reconnect any hoses or components that were removed.
- Reconnect the battery. Start the engine and check for any exhaust or water leaks at the new gasket joint.
Troubleshooting & FAQ
How do I know if my exhaust elbow gasket is failing?
Common signs of a failed gasket include visible water leaks around the manifold/riser joint (especially when the engine is running), rust stains originating from the joint, engine overheating, or water entering the cylinders (which can cause catastrophic engine damage). If you notice any of these signs, inspect the gasket immediately.
Will this fit my specific engine model if it's not listed?
We can only guarantee fitment for the models listed in the compatibility tables. Please check your engine's part manual or original gasket part number and compare it against our Part Number Matrix to ensure compatibility.
Can I reuse my old bolts?
While possible, we recommend using new bolts, especially if the old ones show any signs of corrosion or stretching. Corroded bolts may not torque correctly, leading to leaks. Always apply an appropriate anti-seize compound to the threads of the bolts before installation.
What is the recommended replacement interval for these gaskets?
Replacement interval depends heavily on usage (freshwater vs. saltwater) and operating hours. It's good practice to inspect exhaust gaskets annually. In saltwater environments, they should typically be replaced whenever the manifolds and risers are serviced, usually every 3-5 years.
Do I need to use any sealant with this gasket?
Generally, these gaskets are designed to be installed dry. The composite material is designed to swell slightly with heat and seal the connection. However, always consult your engine's service manual for specific recommendations. In some cases, a very thin layer of a non-hardening sealant may be advised.
Is there a difference in quality between OEM and this aftermarket part?
This listing is for an aftermarket replacement, not an OEM component. It is engineered to meet or exceed OEM-level specifications using comparable high-quality materials. We manufacture parts in an ISO 9002 certified facility and perform batch inspections to ensure consistent quality and performance.
What are your shipping speeds and costs?
We ship worldwide quickly, with typical transit times of 5–15 days for most destinations. Standard shipping is free on all orders. Expedited shipping options, if available for your location, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details for assistance. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not install.
- This is an aftermarket replacement part, not an original equipment (OEM) component.
- Professional installation is highly recommended for safety, proper function, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world durability.
- Fast Global Fulfillment — We offer free standard delivery to most regions with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing facilities, we provide fair pricing without compromising on materials or quality control.
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