Exhaust Elbow Gasket – Fits MerCruiser V6/V8 Engines (Replaces 27-863724)
Exhaust Elbow Gasket – Fits MerCruiser V6/V8 Engines (Replaces 27-863724) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Exhaust Elbow Gasket – Fits MerCruiser V6/V8 Engines (Replaces 27-8...
Exhaust Elbow Gasket – Fits MerCruiser V6/V8 Engines (Replaces 27-863724) is backordered and will ship as soon as it is back in stock.
Product Details
This standard cooling Exhaust Elbow Gasket – Fits MerCruiser V6/V8 Engines 1981-1997 (Replaces 27-863724) provides an optimal seal for MerCruiser V6 and V8 stern drive and inboard engines (1981–1997) with center rise outlet exhaust manifolds. It ensures proper exhaust flow while maintaining a reliable cooling system seal.
This part offers a direct interchange for Mercury/MerCruiser 27-41813, 27-860233, and 27-863724; Sierra 18-0897; Barr MC-20-99208 and MC-47-27-41813; GLM 30240; Osco 8503-GR; Mallory 9-61413; and UanofCn 863724.
- Installs between the exhaust manifold and the riser or elbow.
- Designed for raw water (standard) cooling systems.
- Made from durable metal/composite with graphite for a reliable long-term seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 27-41813 |
| Mercury/MerCruiser | 27-860233 |
| Mercury/MerCruiser | 27-863724 |
| Sierra | 18-0897 |
| Barr | MC-20-99208 |
| Barr | MC-47-27-41813 |
| GLM | 30240 |
| Osco | 8503-GR |
| Mallory | 9-61413 |
| UanofCn | 863724 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser Engines: This gasket fits a wide range of V6 and V8 models produced between 1981 and 1997 that utilize a center rise outlet exhaust manifold.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | V6 4.3L | 175-205 | 4-Stroke | 1983–1997 | 27-863724 | Center rise outlet exhaust manifold |
| MerCruiser | 262 MAG | 175-205 | 4-Stroke | 1983–1997 | 27-863724 | Center rise outlet exhaust manifold |
| MerCruiser | 5.0L | 195+ | 4-Stroke | 1981–1997 | 27-863724 | Center rise outlet exhaust manifold |
| MerCruiser | 5.7L | 220-260 | 4-Stroke | 1981–1997 | 27-863724 | Center rise outlet exhaust manifold |
| MerCruiser | 7.4L | 310-330 | 4-Stroke | 1981–1997 | 27-863724 | Center rise outlet exhaust manifold |
| MerCruiser | 8.2L | 380+ | 4-Stroke | 1981–1997 | 27-863724 | Center rise outlet exhaust manifold |
Technical Specs
- Product Type
- Exhaust Elbow Gasket (Standard Cooling Restrictor)
- Installation
- Between manifold and riser/elbow
- Fuel Type
- Gasoline
- Connection
- Center rise outlet exhaust manifold
- Housing Material
- Metal/Composite with Graphite
- Dimensions
- 102.66 × 112.05 mm (4.04" × 4.4")
- Gasket Style
- Restrictor (Standard Cooling)
- Cooling System
- Raw Water (Standard)
What’s in the Box
- 1-2 × Exhaust Elbow Gasket (equivalent to 27-863724). Package quantity varies by supplier batch.
Installation Notes
- Disconnect the battery and allow the engine to cool completely before beginning work.
- Drain the cooling system as specified by your engine's service manual.
- Carefully disconnect any hoses or sensors attached to the exhaust elbow/riser.
- Remove the mounting bolts securing the elbow to the manifold and lift the elbow away.
- Thoroughly clean both mating surfaces, removing all old gasket material and corrosion. Ensure surfaces are smooth and flat.
- Place the new gasket onto the manifold, ensuring correct alignment with all bolt holes and passages.
- Reinstall the elbow/riser and tighten the bolts to the manufacturer's recommended torque specification and sequence.
- Reconnect all hoses and sensors, then refill the cooling system.
- Start the engine and carefully check for any exhaust or water leaks around the gasket.
Troubleshooting & FAQ
How do I know if I need a restrictor gasket?
This restrictor-style gasket is specified for standard (raw water) cooling systems to regulate water flow and maintain proper engine operating temperature. Using a non-restrictor gasket in a standard cooling system can lead to overcooling. Always refer to your service manual to confirm the correct gasket type for your specific setup.
What are the signs of a failing exhaust elbow gasket?
Common symptoms include water leaking externally from the joint between the manifold and elbow, water entering the engine cylinders (which can cause catastrophic failure), engine overheating, or a noticeable loss of performance. Any signs of rust or water trails around the gasket area warrant an immediate inspection.
How often should this gasket be replaced?
It's recommended to replace exhaust elbow gaskets whenever the manifold or riser is serviced or removed. In saltwater environments, it's good practice to inspect them every 3-5 years as part of preventative maintenance, even if no leaks are apparent.
Will this fit a dry-joint exhaust system?
No, this gasket is designed for traditional wet-joint MerCruiser engines (pre-2002 approximately). Dry-joint systems use a different gasket design and are not compatible.
Is this gasket used on both sides of the engine?
Yes, if your V6 or V8 engine has two exhaust manifolds (one for each cylinder bank), you will need one gasket for each side. It is highly recommended to replace them in pairs.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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