Exhaust Manifold Gasket for MerCruiser, Volvo Penta and OMC 3.0L Engines – Replaces 27-815528 and 3853256
Exhaust Manifold Gasket for MerCruiser, Volvo Penta and OMC 3.0L Engines – Replaces 27-815528 and 3853256 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Exhaust Manifold Gasket for MerCruiser, Volvo Penta and OMC 3.0L En...
Exhaust Manifold Gasket for MerCruiser, Volvo Penta and OMC 3.0L Engines – Replaces 27-815528 and 3853256 is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality exhaust manifold gasket is designed as a replacement for selected 3.0L four-cylinder gasoline marine engines. It is listed for use with MerCruiser, Volvo Penta and OMC applications and helps seal the exhaust manifold to the cylinder head, reducing the risk of exhaust-gas, coolant or water leakage at the mating surfaces.
This aftermarket gasket replaces or cross-references several commonly listed part numbers, including MerCruiser 27-815528, Volvo Penta 3853256 and 914578, OMC 3853256, Sierra 18-0680, GLM 33580 and FEL-PRO 17304. Confirm the part number and gasket shape against the original component before ordering.
- Designed for direct-replacement installation on listed applications.
- For gasoline marine engines using the compatible 3.0L exhaust-manifold configuration.
- Manufactured for consistent sealing performance in marine service.
Part Number Matrix
Use the following references to help compare OEM and aftermarket numbers. Cross-reference numbers are provided for identification and do not replace verification of the engine model and gasket configuration.
| Brand | Part Number |
|---|---|
| MerCruiser | 27-815528 |
| Volvo Penta | 3853256 / 914578 |
| OMC | 3853256 |
| Sierra | 18-0680 |
| GLM | 33580 |
| FEL-PRO | 17304 |
| Aftermarket reference | 815528 |
Engine and Model Compatibility
The applications below reflect the listed 3.0L engine families. Always verify the exact model, year, serial range and existing part number before purchase, because exhaust-manifold configurations can vary.
Listed applications include MerCruiser 3.0L and 3.0LX models, Volvo Penta 3.0L models in the GLM, GLP, GSM, GSP and GXi families, and OMC 3.0L and 3.0L Cobra models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | MCM 3.0L | 115-140 | 4-Stroke | 1998 and 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 listed MPI EC and TKS PLUS variants. |
| Volvo Penta | 3.0L / 3.0GLM | 135 | 4-Stroke | 1993-2010 | 3853256 | Includes listed 3.0GLM-A/B/C variants. |
| Volvo Penta | 3.0GLP | 135 | 4-Stroke | 2002-2010 | 3853256 | Includes listed 3.0GLP-A/B/C/D/E/J/N variants. |
| Volvo Penta | 3.0GSM | 150 | 4-Stroke | 1994-2002 | 3853256 | Includes listed 3.0GSM-A/B/C and related variants. |
| Volvo Penta | 3.0GSP | 150 | 4-Stroke | 1993-2002 | 3853256 | Includes listed 3.0GSP-A/B/C and related variants. |
| Volvo Penta | 3.0GXi | 150 | 4-Stroke | 2008-2009 | 3853256 | Includes the listed 3.0GXiC-J variant. |
| OMC | 3.0L | 140 | 4-Stroke | 1990 and newer | 3853256 | Various listed model codes, including 502AMLPWS and 584APRPWS. |
| OMC | 3.0L Cobra | 140 | 4-Stroke | 1990-1998 | 3853256 | Includes listed 302CMBYC and 302CPLKD model codes. |
Technical Specifications
- Product Type
- Exhaust manifold gasket
- Application
- Selected 3.0L four-cylinder gasoline marine engines
- Installation
- Direct replacement; verify configuration before installation
- Fuel Type
- Gasoline
- Material
- Replacement gasket material intended for marine exhaust-manifold service
- Product Status
- Aftermarket replacement, not an OEM component
What's in the Box
- 1 x Exhaust manifold gasket
Installation Notes
- Disconnect the vessel's battery and allow the engine to cool completely.
- Drain the engine block and exhaust-manifold cooling system as required by the service procedure.
- Carefully disconnect hoses, wires and linkages attached to the exhaust manifold.
- Loosen and remove the manifold mounting bolts in a controlled sequence.
- Remove the old manifold and gasket, taking care not to allow debris to enter the engine ports.
- Clean the cylinder-head and manifold mating surfaces thoroughly, removing old gasket material and corrosion.
- Position the replacement gasket over the alignment dowels or bolt holes in the correct orientation.
- Reinstall the exhaust manifold and start all bolts by hand.
- Torque the bolts in the manufacturer's specified sequence and to the manufacturer's specified values.
- Reconnect all hoses, wires and linkages.
- Refill the cooling system, reconnect the battery and run the engine while checking for exhaust or coolant leaks.
Troubleshooting and FAQ
How do I confirm this gasket is correct for my engine?
Compare your engine brand, exact model, year and serial information with the application information above. Also compare the existing gasket shape and part number with the references in the part-number matrix. If the shape, bolt-hole pattern or port openings differ, do not install the gasket.
What are the signs of a failing exhaust manifold gasket?
Possible symptoms include exhaust or coolant leakage around the manifold, water or steam in the engine bay, overheating, unusual exhaust noise, loss of performance or water contamination in the engine oil. Continued operation with a leak can cause additional engine damage.
Should I use sealant with this gasket?
Many exhaust-manifold gaskets are intended for dry installation. Do not apply sealant unless the engine manufacturer's service instructions specifically require it. Always follow the official service manual for your engine.
How often should this gasket be replaced?
There is generally no fixed replacement interval. Replace the gasket whenever the exhaust manifold is removed for service or when inspection confirms an exhaust, coolant or water leak.
Is this an OEM part or aftermarket?
This is an aftermarket replacement gasket, not an OEM component. The listed brand names and part numbers are used to identify compatible applications and cross-reference numbers.
How fast is shipping?
Shipping availability and delivery estimates are shown at checkout based on the destination and selected service. Transit times may vary by region and carrier.
What is the warranty and return policy?
Warranty coverage and return eligibility are subject to the seller's current policy. Contact customer support with your order information before returning or installing a part if you believe it is defective or incorrect.
Safety and Important Information
- Verify the engine model, year, serial information, existing part number and gasket configuration before purchase.
- Do not rely on a model listing alone if the original gasket, bolt pattern or exhaust-port layout differs.
- This is an aftermarket replacement part. Brand names and part numbers are provided for identification and compatibility reference.
- Professional installation is recommended. Incorrect installation or torque can cause exhaust, coolant or water leaks and may result in engine damage.
- Allow the engine to cool fully and follow all applicable marine service and safety procedures before beginning work.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service and practical installation.
- Fast Global Fulfillment — Delivery options and estimated arrival dates are provided during checkout.
- Manufacturer-Direct Value — We work to provide practical replacement solutions at competitive prices.
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