Exhaust Riser Gasket – Fits Volvo Penta & OMC V6/V8 (Replaces 3863191)
Exhaust Riser Gasket – Fits Volvo Penta & OMC V6/V8 (Replaces 3863191) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Riser Gasket – Fits Volvo Penta & OMC V6/V8 (Replaces 3...
Product Details
This Exhaust Riser Gasket is engineered for Volvo Penta and OMC V6 & V8 gasoline engines from 1994 and newer that are equipped with center-style 4-inch exhaust risers. It ensures a reliable seal between the exhaust manifold and the riser, preventing water and exhaust leaks.
This part serves as a direct cross-reference for Volvo Penta 3863191, 3850496, and 351325; GLM 51334 (starboard) and 51332 (port); and Sierra 18-4431.
- Installs on center-style 4-inch exhaust risers.
- Designed for gasoline engine applications.
- Sold as a package of two gaskets for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 3863191 | Supersedes 3850496, 351325 |
| GLM | 51334 | Starboard |
| GLM | 51332 | Port |
| Sierra | 18-4431 | |
| OSC | OSC50456-G |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta V6 and V8 engines from 1994-onward with center-style exhaust risers, including Ford-based 5.0L and 5.8L models.
For OMC Cobra V6 and V8 engines from 1994-onward with center-style exhaust systems.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 5.0L/302 CID | Various | 4-Stroke | 1994–Newer | 3863191 | Ford-based V8 engines |
| Volvo Penta | 5.8L/351 CID | Various | 4-Stroke | 1994–Newer | 3863191 | Ford-based V8 engines |
| Volvo Penta | V6 Series | Various | 4-Stroke | 1994–Newer | 3863191 | Center-style 4-inch exhaust risers |
| OMC | Cobra V6 | Various | 4-Stroke | 1994–Newer | Center-style exhaust systems | |
| OMC | Cobra V8 | Various | 4-Stroke | 1994–Newer | Center-style exhaust systems |
Technical Specs
- Product Type
- Exhaust Riser Gasket
- Installation
- Center-style 4-inch exhaust risers
- Fuel Type
- Gasoline
- Housing Material
- Composite
- Dimensions
- Fits 4-inch exhaust openings
- Product Dimensions
- 16" L x 12" W x 1" H
- Other Technical Attributes
- Sold as a package of 2 gaskets
What’s in the Box
- 2 x Exhaust Riser Gaskets (Replaces 3863191)
Installation Notes
- Disconnect the boat's battery before beginning work.
- Drain the engine cooling system to lower the coolant level below the exhaust manifolds.
- Carefully label and disconnect any hoses, wires, or sensors attached to the exhaust riser.
- Remove the mounting bolts securing the exhaust riser to the manifold.
- Gently break the seal and remove the old riser. Set it aside.
- Remove the old gasket and thoroughly clean both the manifold and riser mating surfaces. Ensure they are free of old gasket material, rust, and debris.
- Position the new gasket onto the exhaust manifold, aligning it with the bolt holes.
- Carefully place the exhaust riser back onto the manifold, ensuring proper alignment with the new gasket.
- Apply thread locker to the bolts if recommended by your service manual, and tighten them in a crisscross pattern to the manufacturer's specified torque. Do not overtighten.
- Reconnect all hoses, wires, and sensors.
- Refill the cooling system, reconnect the battery, and start the engine.
- Check for any exhaust or water leaks around the gasket seal.
Troubleshooting & FAQ
How can I confirm this gasket fits my specific engine model?
The surest way is to check your engine's service manual or existing part for the OEM part number. If it matches any of the numbers in our Part Number Matrix (like Volvo Penta 3863191), it will fit. You can also use the Engine & Model Compatibility table to verify your engine series and year range.
What are the signs of a failing exhaust riser gasket?
Common symptoms include water or steam in the engine bay, visible water dripping from the joint between the manifold and riser, engine overheating, and, in severe cases, water entering the cylinders, which can cause hydrostatic lock and catastrophic engine damage.
Should I use a sealant or adhesive with this gasket?
These gaskets are typically designed to be installed dry. Using sealant can sometimes interfere with a proper seal or cause premature failure. Always consult your engine's official service manual for the recommended procedure for your specific model.
How often should exhaust riser gaskets be replaced?
It depends on usage, particularly whether the boat is used in saltwater or freshwater. In saltwater environments, it's recommended to inspect exhaust components, including gaskets and risers, every 3-5 years. In freshwater, they can last longer, but should still be inspected regularly as part of routine maintenance.
What is the difference between an OEM and an aftermarket part?
This listing is for an aftermarket replacement part, not an original equipment manufacturer (OEM) component. Our parts are engineered to meet or exceed OEM-level specifications using comparable high-quality materials. They are produced in an ISO 9002 certified facility and are batch-inspected to ensure consistent quality and fitment.
How fast is shipping and what does it cost?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free for all orders. If available for your location, expedited shipping options and their costs will be displayed at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal operating conditions. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original packaging. Please see our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model appears on the compatibility list—do not purchase.
- This is an aftermarket replacement part, not an original OEM component.
- Professional installation is strongly recommended for safety, proper performance, 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 reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions with a typical transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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