3" Recmar Riser Kit for Marine Exhaust – Fits MerCruiser Inboard Engines (Replaces 864929A3)
3" Recmar Riser Kit for Marine Exhaust – Fits MerCruiser Inboard Engines (Replaces 864929A3) 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
3" Recmar Riser Kit for Marine Exhaust – Fits MerCruiser Inboa...
Product Details
This 3" Recmar Riser Kit for Marine Exhaust – Fits MerCruiser Inboard Engines (Replaces 864929A3) is a critical component designed for marine inboard engines. It elevates the exhaust gas outlet to prevent water from flowing back into the engine cylinders, which is essential for protecting the engine from catastrophic damage and extending its operational life.
This kit serves as a direct replacement for MerCruiser part 864929A3 and BARR part MC-20-864929A3.
- Engineered for direct bolt-on installation.
- Constructed from saltwater-resistant iron for enhanced durability.
- Includes the riser and essential mounting hardware.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 864929A3 |
| BARR | MC-20-864929A3 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | Inboard Engines | 864929A3 | Universal 3" marine exhaust systems |
Technical Specs
- Product Type
- Marine Exhaust Riser Kit
- Installation
- Direct replacement
- Fuel Type
- Compatible with gasoline marine engines
- Connection
- 3 inches (76 mm) diameter
- Housing Material
- Iron
- Dimensions
- Height: 14.0", Width: 18.0", Length: 22.0"
- Weight
- 10.5 kg (23.15 lbs)
- Fitting Type
- Direct bolt-on
- Other Technical Attributes
- Saltwater resistant material
What’s in the Box
- 1 x 3" Riser Kit (HGE4929)
- Mounting hardware and gaskets
Installation Notes
- Disconnect the vessel's battery and close the raw water seacock.
- Drain the coolant from the exhaust manifold system.
- Carefully disconnect the exhaust hoses connected to the riser.
- Remove the mounting bolts securing the old riser and lift it off the manifold.
- Thoroughly clean the mating surfaces on the manifold, removing any old gasket material or corrosion.
- Position the new gasket and riser onto the manifold.
- Apply thread sealant to the new bolts and tighten them in a crisscross pattern to the manufacturer's recommended torque specifications.
- Reconnect the exhaust hoses and secure them with clamps.
- Open the raw water seacock and refill the cooling system.
- Reconnect the battery.
- Start the engine and carefully inspect for any water or exhaust leaks around the new installation.
Troubleshooting & FAQ
How do I know if this riser kit fits my engine?
This kit is designed for MerCruiser inboard engines that specify a 3" riser and cross-reference with OEM part number 864929A3. The most reliable method is to compare the specifications, dimensions, and photos against your original part before ordering.
What are the signs of a failing exhaust riser?
Common symptoms of a bad riser include engine overheating, water intrusion into engine oil (appearing milky), starting difficulties, reduced engine performance, and visible rust stains or water leaks on the exterior of the riser or manifold.
What is the recommended replacement interval for exhaust risers?
In saltwater environments, it's best practice to inspect risers annually and plan for replacement every 3-5 years. In freshwater, the interval can be longer, typically 5-8 years, but regular inspection is still crucial to prevent engine damage.
Is a new gasket included with this kit?
Yes, the kit includes all necessary gaskets and mounting hardware required for a standard installation.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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