MerCruiser Exhaust Elbow Gasket 27-863724 – Fits MerCruiser V6/V8 Engines 1981-1997

MerCruiser Exhaust Elbow Gasket 27-863724 – Fits MerCruiser V6/V8 Engines 1981-1997

This standard cooling restrictor gasket fits MerCruiser V6 and V8 stern drive and inboard engines (1981-1997) with center rise outlet exhaust manifolds. It is designed to provide optimal exhaust flow while maintaining a proper cooling system seal.

This part is a direct replacement for Mercury/MerCruiser 27-41813, 27-860233, 27-863724; Sierra 18-0897; Barr MC 20 99208, MC47-27-41813; GLM 30240; Osco 8503-GR; and Mallory 9-61413.

• Installation Location: Mounts between the exhaust manifold and riser/elbow.
• Gasket Type: Restrictor style for standard cooling systems.
• Fuel Type Compatibility: Gasoline.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Exhaust Elbow Gasket (27-863724)

Installation Guide

1. Ensure the engine is completely cool and disconnect the battery terminals for safety.
2. Drain the engine cooling system as required to access the exhaust components without spillage.
3. Carefully unbolt and remove the exhaust riser or elbow from the exhaust manifold.
4. Remove the old gasket and meticulously clean both mating surfaces. Use a scraper or wire brush to remove all old gasket material, rust, and debris.
5. Position the new 27-863724 gasket on the manifold, ensuring it is correctly aligned with the bolt holes and passages.
6. Reinstall the exhaust riser/elbow and tighten the bolts in a crisscross pattern to the manufacturer's specified torque.
7. Reconnect all hoses and refill the cooling system with the appropriate coolant.
8. Reconnect the battery, start the engine, and carefully inspect the gasket area for any signs of water or exhaust leaks.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my engine?
A: This gasket fits MerCruiser V6 and V8 engines (1981-1997) that use a center rise outlet exhaust manifold. Please check the "Compatible Engine Models" table and cross-reference your OEM part number (e.g., 27-863724, 27-41813) to ensure a match.

Q: Is this a restrictor gasket or an open gasket?
A: This is a restrictor-style gasket for standard cooling systems. It is designed to regulate water flow for optimal engine temperature in specific applications.

Q: What are the signs that my old gasket has failed?
A: Common signs of a failing exhaust elbow gasket include visible water leaks from the joint between the manifold and elbow, engine overheating, or, in severe cases, water entering the engine cylinders, which can cause significant internal damage.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.