Exhaust Manifold Gasket – Fits MerCruiser, Volvo Penta, OMC 3.0L (Replaces 27-815528, 3853256)
Exhaust Manifold Gasket – Fits MerCruiser, Volvo Penta, OMC 3.0L (Replaces 27-815528, 3853256) 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 Manifold Gasket – Fits MerCruiser, Volvo Penta, OMC 3.0L (R...
Product Details
This high-quality Exhaust Manifold Gasket is engineered for a precise fit on a range of 3.0L 4-cylinder marine engines. It is compatible with MerCruiser models from 1990 to present, Volvo Penta models from 1993 to 2010, and OMC engines from 1990 and up, ensuring a reliable seal for your engine's exhaust system.
This gasket serves as a direct replacement for several OEM and aftermarket parts, including MerCruiser 27-815528, Volvo Penta 3853256 and 914578, OMC 3853256, Sierra 18-0680, GLM 33580, and FEL-PRO 17304.
- Engineered for direct-fit installation.
- Designed for use in gasoline marine engines.
- Manufactured in an ISO 9002 certified facility for consistent quality.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 27-815528 |
| Volvo Penta | 3853256 / 914578 |
| OMC | 3853256 |
| Sierra | 18-0680 |
| GLM | 33580 |
| FEL-PRO | 17304 |
| UanofCn | 815528 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits MerCruiser 3.0L and 3.0LX models (1990–Present).
Fits Volvo Penta 3.0L models including GLM, GLP, GSM, GSP, and GXi series (1993–2010).
Fits OMC 3.0L and 3.0L Cobra models (1990 & Up).
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | MCM 3.0L | 115-140 | 4-Stroke | 1998 & Newer | 27-815528 | |
| MerCruiser | MCM 3.0LX | 115-140 | 4-Stroke | 1990–1997 | 27-815528 | |
| MerCruiser | 3.0L | 115-140 | 4-Stroke | 1998-present | 27-815528 | Includes MPI EC, TKS PLUS variants |
| Volvo Penta | 3.0L/3.0GLM | 135 | 4-Stroke | 1993–2010 | 3853256 | Includes variants: 3.0GLM-A/B/C |
| Volvo Penta | 3.0GLP | 135 | 4-Stroke | 2002–2010 | 3853256 | Includes variants: 3.0GLP-A/B/C/D/E/J/N |
| Volvo Penta | 3.0GSM | 150 | 4-Stroke | 1994–2002 | 3853256 | Includes variants: 3.0GSM-A/B/C, GSMBYMCE, GSMHUB, GSMLKD, etc. |
| Volvo Penta | 3.0GSP | 150 | 4-Stroke | 1993–2002 | 3853256 | Includes variants: 3.0GSP-A/B/C, GSPLKD, GSPMDA, etc. |
| Volvo Penta | 3.0GXi | 150 | 4-Stroke | 2008–2009 | 3853256 | Includes 3.0GXiC-J variant |
| OMC | 3.0L | 140 | 4-Stroke | 1990 & Up | 3853256 | Various model codes including 502AMLPWS, 584APRPWS, etc. |
| OMC | 3.0L Cobra | 140 | 4-Stroke | 1990–1998 | 3853256 | Includes model codes 302CMBYC, 302CPLKD, etc. |
Technical Specs
- Product Type
- Exhaust Manifold Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Housing Material
- OEM specification material
- Warranty
- Limited lifetime (Sierra), 1 Year (UanofCn/YiheoZux)
- Other Technical Attributes
- ISO9002 certified production (JLM Marine)
What’s in the Box
- 1 x Exhaust Manifold Gasket (Replaces 27-815528 / 3853256)
Installation Notes
- Disconnect the vessel's battery and allow the engine to cool completely.
- Drain the engine block and exhaust manifold cooling system.
- Carefully disconnect any hoses, wires, or linkages attached to the exhaust manifold.
- Systematically loosen and remove the manifold mounting bolts.
- Remove the old manifold and gasket. Be careful not to drop any debris into the engine ports.
- Thoroughly clean the mating surfaces on both the cylinder head and the manifold, removing all old gasket material and corrosion.
- Position the new gasket correctly over the alignment dowels or bolt holes.
- Reinstall the exhaust manifold, starting all bolts by hand.
- Torque the bolts to the manufacturer's specified sequence and torque values.
- Reconnect all hoses, wires, and linkages.
- Refill the cooling system, reconnect the battery, and start the engine, checking carefully for any exhaust or coolant leaks.
Troubleshooting & FAQ
How do I confirm this gasket is correct for my engine?
Verify your engine's brand, model, and year against the compatibility chart provided. Most importantly, cross-reference your existing part number with those listed in our Part Number Matrix to ensure an exact match.
What are the signs of a failing exhaust manifold gasket?
Common symptoms include water or steam in the engine bay, visible coolant leaks around the manifold, milky engine oil (indicating water contamination), engine overheating, or a loss of performance. White steam from the exhaust after the engine is warm is another key indicator.
Should I use sealant with this gasket?
Most modern exhaust gaskets like this one are designed to be installed dry. Applying sealant can interfere with the seal. Always follow the specific instructions in your engine’s official service manual.
How often should this gasket be replaced?
There is no fixed replacement interval. This gasket should be replaced any time the exhaust manifold is removed for service or if an exhaust or coolant leak is detected.
Is this an OEM part or aftermarket?
This is a high-quality aftermarket replacement part, not an OEM component. It is engineered to meet or exceed OEM specifications using comparable materials and is produced in an ISO 9002 certified facility, with batch inspections to ensure quality and consistency.
How fast is shipping?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free, and expedited options will be shown at checkout if available for your location.
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 number. Returns are accepted within our standard return window for items in unused, 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 on the compatibility list—do not order.
- This is an aftermarket replacement part, not an OEM component. All mentions of brand names and part numbers are for reference purposes only.
- Professional installation is highly recommended for safety, proper function, and performance. Incorrect installation can lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical arrival in 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without ever compromising on materials or quality control.
Payment & Security
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