Full-Flow Elbow Gasket for MerCruiser Dry-Joint V-6 & V-8 — Replaces 864547A02, 864547A1
Full-Flow Elbow Gasket for MerCruiser Dry-Joint V-6 & V-8 — Replaces 864547A02, 864547A1 is backordered and will ship as soon as it is back in stock.
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Full-Flow Elbow Gasket for MerCruiser Dry-Joint V-6 & V-8 — Rep...
Full-Flow Elbow Gasket for MerCruiser Dry-Joint V-6 & V-8 — Replaces 864547A02, 864547A1 is backordered and will ship as soon as it is back in stock.
Product Details
This full-flow elbow gasket is an aftermarket replacement for MerCruiser dry-joint exhaust systems used with V-6 and V-8 gasoline engines. It is installed at the exhaust manifold-to-riser connection to help seal the joint and maintain the intended cooling and exhaust flow configuration.
The gasket is listed as a replacement for MerCruiser references 27-864547A02 and 27-864547A1, including the corresponding references without the prefix: 864547A02 and 864547A1.
- Full-flow exhaust elbow gasket configuration.
- Designed for MerCruiser dry-joint manifold and riser connections.
- For applicable V-6 and V-8 gasoline engine applications.
- Aftermarket replacement component; not manufactured by MerCruiser.
Part Number Matrix
Use the references below when comparing the gasket with the part removed from your engine. Part-number matching alone does not replace verification of the exhaust-manifold and riser design.
| Brand or Source | Part Number | Reference Type |
|---|---|---|
| MerCruiser | 27-864547A02 | OEM reference |
| MerCruiser | 864547A02 | OEM reference without prefix |
| MerCruiser | 27-864547A1 | OEM reference; superseded reference may apply |
| MerCruiser | 864547A1 | OEM reference without prefix |
| Sierra | 18-0721 | Aftermarket interchange reference |
Engine & Model Compatibility
This gasket is intended for specific MerCruiser dry-joint exhaust applications. The engine family, exhaust-manifold design, riser design, model year, and serial-number range must all be checked before installation.
| Brand | Engine Family or Displacement | Configuration | Exhaust System | Reference | Fitment Note |
|---|---|---|---|---|---|
| MerCruiser | V-6, including 4.3L applications | Gasoline, 4-stroke | Dry-joint manifold and riser | 27-864547A02 / 27-864547A1 | Verify exact model year, serial range, and gasket shape. |
| MerCruiser | V-8, including 5.0L, 5.7L, and 6.2L applications | Gasoline, 4-stroke | Dry-joint manifold and riser | 27-864547A02 / 27-864547A1 | Verify exact model year, serial range, and gasket shape. |
Important: Do not use this gasket on a wet-joint exhaust system or on an application requiring a restricted or blocked cooling passage. Compare the old gasket, manifold, riser, and applicable engine service information before ordering.
Technical Specifications
- Product Type
- Full-flow exhaust elbow gasket
- Application
- MerCruiser dry-joint exhaust manifold and riser connection
- Engine Configuration
- Applicable gasoline V-6 and V-8, 4-stroke marine engines
- Cooling Configuration
- Full-flow configuration where specified by the engine application
- Installation Location
- Between the exhaust manifold and riser or elbow
- Reference Numbers
- 27-864547A02, 864547A02, 27-864547A1, and 864547A1
- Product Status
- Aftermarket replacement; not an OEM component
What’s in the Box
- 1 × Full-flow dry-joint elbow gasket
Bolts, risers, manifolds, sealant, and other installation hardware are not included unless specifically shown or stated in the product options.
Installation Notes
- Allow the engine to cool completely and disconnect the battery before beginning work.
- Follow the engine manufacturer’s service procedure for draining or isolating the cooling system.
- Remove the riser or elbow from the exhaust manifold using the correct tools and procedure.
- Clean both mating surfaces thoroughly. Remove old gasket material, corrosion, and debris without damaging the sealing surfaces.
- Compare the new gasket with the removed gasket and confirm that the openings and bolt pattern match.
- Position the gasket correctly on the dry-joint connection. Do not force or modify the gasket.
- Reinstall the riser or elbow and tighten the fasteners in the manufacturer-specified sequence and to the manufacturer-specified torque.
- Do not apply sealant unless the applicable MerCruiser service instructions specifically require it.
- Restore the cooling system, reconnect the battery, and run the engine according to the service procedure.
- Inspect the joint for exhaust or water leaks after installation and again after the engine reaches operating temperature.
Troubleshooting & FAQ
How do I confirm that this gasket fits my engine?
Confirm the MerCruiser engine family, model year, serial-number range, exhaust-manifold and riser design, and the reference number on the gasket being replaced. This product is intended for applicable dry-joint V-6 and V-8 gasoline engines. Compare the gasket shape and openings before installation.
What is a dry-joint exhaust system?
A dry-joint system uses a specific manifold-to-riser sealing design. Its gasket openings and cooling passages differ from wet-joint designs. This gasket should only be used where the engine’s service information specifies the matching dry-joint, full-flow configuration.
Is this a full-flow or restricted gasket?
This is a full-flow elbow gasket. Do not substitute it for a restricted or blocked gasket, or use it where the engine application calls for a different cooling-passage arrangement.
Can this gasket be used on an older wet-joint system?
No. A wet-joint exhaust system may require a different gasket design. Confirm the exhaust system type and compare the original gasket before ordering.
Should gasket sealant be used?
Install the gasket according to the applicable MerCruiser service instructions. Do not use sealant or gasket cement unless the service procedure specifically calls for it, because excess sealant can affect the sealing surface or cooling passages.
What are common signs of a failed elbow gasket?
Possible signs include water or exhaust leakage at the manifold-to-riser joint, corrosion or staining around the connection, overheating, or other cooling-system symptoms. Inspect the complete exhaust and cooling system to identify the actual cause.
Is this an OEM gasket?
No. This is an aftermarket replacement gasket listed for the MerCruiser references shown above. It is not manufactured or branded by MerCruiser.
Safety & Important Information
- Verify the engine model, year, serial range, exhaust-system type, reference number, gasket openings, and bolt pattern before purchase.
- Do not use this product on a wet-joint system or in place of a restricted gasket unless the applicable service information confirms the match.
- Use the manufacturer’s torque values and installation procedure for the specific engine.
- Professional installation is recommended when exhaust-manifold or riser service is required.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for common marine repair applications.
- Application-Focused Information — Reference numbers and installation guidance are provided to help you compare the replacement with the original part.
- Fitment Verification — Always confirm the complete engine and exhaust-system details before installation.
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