Exhaust Elbow Gasket for Mercury MerCruiser 4.3L–8.2L Engines — Replaces 27-863726 and 27-860232
Exhaust Elbow Gasket for Mercury MerCruiser 4.3L–8.2L Engines — Replaces 27-863726 and 27-860232 is backordered and will ship as soon as it is back in stock.
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Exhaust Elbow Gasket for Mercury MerCruiser 4.3L–8.2L Engines — Rep...
Exhaust Elbow Gasket for Mercury MerCruiser 4.3L–8.2L Engines — Replaces 27-863726 and 27-860232 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Exhaust Elbow Gasket is intended for selected Mercury MerCruiser 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, and 8.2L V6 and V8 applications that use a compatible center-rise exhaust manifold and 4-inch riser connection. It seals the joint between the exhaust manifold and riser to help prevent water and exhaust leaks.
Application depends on the engine configuration, exhaust-manifold design, cooling system, and production year. Confirm the engine model, year, manifold style, gasket opening, and existing part number before ordering.
This gasket is listed as a replacement for Mercury/Quicksilver references 27-863726 and 27-860232. Additional aftermarket references are provided below as cross-reference leads and should be verified against the original gasket before installation.
- For compatible standard full-flow cooling applications.
- Graphite-composite gasket construction for exhaust-manifold service.
- Designed for compatible 4-inch exhaust riser connections.
- Aftermarket replacement part; not manufactured by Mercury or Quicksilver.
Part Number Matrix
Use these references to compare the original gasket and confirm the correct application. A number match alone does not replace checking the manifold and cooling-system configuration.
| Brand | Part Number |
|---|---|
| Mercury / Quicksilver | 27-863726 |
| Mercury / Quicksilver | 27-860232 |
| Mercury | 27-818832 |
| Mercury | 27-871051 |
| Mercury | 27-87105 |
| Sierra | 18-2849-1 |
| Barr | 8503-GO |
| Mallory | 961414 |
| GLM | 32080 |
Engine & Model Compatibility
The applications below represent the intended MerCruiser V6 and V8 engine families for this style of gasket. Exact fitment must be confirmed by engine model, year, exhaust-manifold design, cooling arrangement, and original gasket comparison.
| Brand | Engine Family | Stroke | Example Year Range | Reference | Required Condition |
|---|---|---|---|---|---|
| MerCruiser | 4.3L 262 CID V6 GM | 4-Stroke | Selected 1998–2001 applications | 27-863726 | Compatible center-rise manifold and 4-inch riser connection |
| MerCruiser | 5.0L 305 CID V8 GM | 4-Stroke | Selected 1998–2001 applications | 27-863726 | Compatible center-rise manifold and standard cooling arrangement |
| MerCruiser | 5.7L 350 CID V8 GM | 4-Stroke | Selected 1998–2001 applications | 27-863726 | Compatible center-rise manifold and standard cooling arrangement |
| MerCruiser | 6.2L 377 CID V8 GM | 4-Stroke | Selected applications | 27-863726 | Verify manifold design and gasket opening |
| MerCruiser | 7.4L 454 CID V8 GM | 4-Stroke | Selected applications | 27-863726 | Verify engine generation, manifold design, and cooling system |
| MerCruiser | 8.2L 502 CID V8 GM | 4-Stroke | Selected applications | 27-863726 | Verify engine generation, manifold design, and cooling system |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Installation Type
- Full-flow/open style, where specified by the engine application
- Material
- Graphite composite
- Application
- Compatible MerCruiser exhaust-manifold and riser assemblies
- Connection Size
- For compatible 4-inch exhaust riser connections
- Quantity
- 1 gasket
What’s in the Box
- 1 x Exhaust Elbow Gasket
Installation Notes
- Allow the engine to cool completely before beginning work.
- Disconnect the battery and close the water seacock, where applicable.
- Drain water from the exhaust-manifold and riser area as required by the service procedure.
- Remove the fasteners connecting the exhaust riser or elbow to the manifold.
- Separate the riser from the manifold and remove the old gasket.
- Clean both mating surfaces thoroughly. Remove old gasket material, rust, scale, and debris.
- Position the replacement gasket correctly. Install it dry unless the engine service manual specifies an approved sealant or installation compound.
- Reinstall the riser or elbow and tighten the fasteners in the recommended sequence and to the manufacturer's specified torque.
- Reconnect the battery, reopen the seacock, and run the engine according to the service procedure.
- Inspect the joint for water or exhaust leaks after the engine reaches operating temperature.
Troubleshooting & FAQ
What is the difference between an open full-flow gasket and a restricted gasket?
An open or full-flow gasket has a larger water passage and is used only where specified for the cooling-system design. Restricted gaskets use smaller passages and may be required for certain closed-loop or freshwater-cooled configurations. Installing the wrong style can contribute to overheating, over-cooling, or improper water flow.
How can I confirm whether this gasket fits my engine?
Compare the engine model and year, exhaust-manifold and riser design, cooling-system type, gasket opening, bolt pattern, and original part number. The references in this listing are useful for comparison, but the physical gasket and engine service information should also agree.
What are the signs of a failing exhaust elbow gasket?
Possible symptoms include water leaking at the manifold-to-riser joint, water in the bilge, exhaust odor, steam, overheating, corrosion, or visible damage around the gasket. Shut down the engine and inspect the assembly if a leak is suspected.
How many gaskets are included?
This listing includes one exhaust elbow gasket. A V-block engine normally uses one gasket at each manifold-to-riser joint, so order the quantity required for your specific engine or boat.
Is sealant required for installation?
Do not apply sealant unless the engine or gasket manufacturer's instructions specifically require it. Many exhaust elbow gaskets are installed dry, but the applicable service manual takes priority.
Is this an OEM part?
No. This is an aftermarket replacement gasket intended to correspond to the listed manufacturer and aftermarket reference numbers.
Safety & Important Info
- Verify the engine model, year, exhaust-manifold design, cooling system, dimensions, and original gasket before purchase.
- Do not rely on horsepower or engine displacement alone to establish fitment.
- Use the manufacturer's torque specifications and installation procedure.
- Professional installation is recommended if you are unfamiliar with marine exhaust and cooling systems.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for common marine service applications.
- Application-Focused Listings — Reference numbers and compatibility details are provided to help you compare the original part.
- Fitment Responsibility — Always verify the complete engine and exhaust configuration before installation.
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