Restrictor Exhaust Elbow Gasket for MerCruiser V6 & V8 Stern Drive – Replaces 27-863724, 27-41813, 27-860233
Restrictor Exhaust Elbow Gasket for MerCruiser V6 & V8 Stern Drive – Replaces 27-863724, 27-41813, 27-860233 is backordered and will ship as soon as it is back in stock.
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Restrictor Exhaust Elbow Gasket for MerCruiser V6 & V8 Stern Dr...
Restrictor Exhaust Elbow Gasket for MerCruiser V6 & V8 Stern Drive – Replaces 27-863724, 27-41813, 27-860233 is backordered and will ship as soon as it is back in stock.
Product Details
This restrictor-style exhaust elbow gasket is an aftermarket replacement for selected MerCruiser V6 and V8 stern-drive exhaust applications. It seals the joint between the exhaust manifold and riser or elbow and is intended for applications using the restrictor-style gasket pattern.
Catalog references identify this restrictor gasket as Sierra 18-0897 and list it as replacing Mercury Marine references 27-41813, 27-860233, and 27-863724. Always compare the gasket pattern and cooling-system requirements with your original part before installation.
- Restrictor-style exhaust elbow gasket.
- For selected MerCruiser V6 and V8 stern-drive applications.
- Designed for use with compatible riser and exhaust-elbow assemblies.
- Aftermarket replacement component; not an OEM Mercury Marine part.
Part Number Matrix
The following references are documented as replacement or equivalent catalog numbers for this gasket style.
| Brand or Reference Type | Part Number |
|---|---|
| Mercury Marine / MerCruiser OEM reference | 27-863724 |
| Mercury Marine / MerCruiser OEM reference | 27-41813 |
| Mercury Marine / MerCruiser OEM reference | 27-860233 |
| Sierra aftermarket reference | 18-0897 |
Engine & Model Compatibility
This gasket is associated with selected MerCruiser stern-drive exhaust systems using GM V6 and V8 engines. The available catalog relationship identifies compatible riser references rather than a complete engine model, year, horsepower, serial-number, or cooling-system list.
| Brand | Application | Engine Type | Gasket Style | Associated Riser References | Fitment Note |
|---|---|---|---|---|---|
| MerCruiser | Selected stern-drive exhaust systems | GM V6 and V8 | Restrictor | 18-1976-2, 18-1970-2 | Confirm the original gasket pattern and cooling-system configuration before ordering. |
Technical Specs
- Product Type
- Exhaust elbow gasket
- Gasket Style
- Restrictor-style
- Application
- Exhaust manifold to riser or elbow joint
- Engine Application
- Selected MerCruiser V6 and V8 stern-drive systems
- Installation
- Direct replacement when the original gasket pattern and application match
- Aftermarket Reference
- Sierra 18-0897
- OEM References
- 27-863724, 27-41813, 27-860233
What’s in the Box
- 1 x Restrictor exhaust elbow gasket
Risers, exhaust elbows, bolts, plugs, and other installation hardware are not included unless specifically shown in the order details.
Installation Notes
- Disconnect the battery and allow the engine and exhaust system to cool completely.
- Drain or contain the cooling water as required for your engine and remove the exhaust hose or connections that obstruct access.
- Unbolt the riser or exhaust elbow and note the orientation of the original gasket.
- Clean both mating surfaces thoroughly. Remove old gasket material, corrosion, oil, and debris without damaging the sealing surfaces.
- Confirm that the replacement gasket has the same restrictor pattern and orientation as the original application.
- Install the gasket, reinstall the riser or exhaust elbow, and tighten the fasteners according to the engine or component manufacturer's service procedure.
- Reconnect the exhaust hose and clamps, restore the cooling system, and inspect for water or exhaust leaks during the initial run.
Troubleshooting & FAQ
Is this an open-style or restrictor-style gasket?
This is a restrictor-style gasket. Do not substitute it for an open or full-flow gasket unless that gasket style is specified for your exact engine and cooling-system configuration.
Will this fit every MerCruiser V6 or V8?
No. It is intended for selected stern-drive exhaust applications. Engine family alone is not sufficient to confirm fitment; compare the original gasket pattern, riser or elbow arrangement, and cooling-system requirements.
Which part numbers does it replace?
Available catalog references list Mercury Marine or MerCruiser numbers 27-863724, 27-41813, and 27-860233, with Sierra aftermarket reference 18-0897. Verify the reference and gasket pattern before installation.
Can I use this gasket with a closed cooling system?
Do not assume compatibility. Restrictor and open-style gaskets can serve different cooling-system requirements. Follow the engine manufacturer's service information and confirm the specified gasket style for your system.
What are the signs of a failed exhaust elbow gasket?
Possible symptoms include water or exhaust leakage at the manifold-to-riser joint, overheating, steam, or visible corrosion around the sealing area. Stop operation and inspect the assembly if leakage is suspected.
Is this an OEM Mercury Marine part?
No. This is an aftermarket replacement gasket referenced against the listed Mercury Marine or MerCruiser OEM numbers.
Safety & Important Information
- Verify the gasket shape, openings, restrictor pattern, riser or elbow configuration, and cooling-system requirements before purchase.
- Do not rely on engine brand, displacement, or horsepower alone to confirm fitment.
- Use the manufacturer's torque specifications and service procedures during installation.
- Professional installation is recommended if the exhaust system, cooling system, or sealing surfaces require service.
About Sea Sierra
- We supply replacement marine components for maintenance and repair applications.
- Product listings are organized around documented part-number and application references.
- Always compare the original component and confirm application details before installation.
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