Exhaust Elbow Gasket – Fits MerCruiser V6 & V8 Stern Drive (Replaces 27-863724, 27-41813, 27-860233)

Exhaust Elbow Gasket – Fits MerCruiser V6 & V8 Stern Drive (Replaces 27-863724, 27-41813, 27-860233)

This restrictor-style exhaust elbow gasket is designed for MerCruiser V6 and V8 engines with center rise outlet exhaust manifolds, manufactured from 1981 to 1997. It ensures a proper seal for standard cooling systems where water is intended to flow through the gasket openings.

It serves as a direct replacement for Mercury/MerCruiser part numbers 27-863724, 27-41813, and 27-860233.

• Gasket Type: Restrictor style for standard cooling systems.
• Application: Fits MerCruiser V6 & V8's with center rise exhaust manifolds (1981-1997).
• Package Includes: Four exhaust elbow gaskets.

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

4 x Exhaust Elbow Gasket (Replaces 27-863724, 27-41813, 27-860233)

Installation Guide

For a successful installation, please follow these steps:

1. Safety First: Ensure the engine is completely cool and disconnect the boat's battery before starting.
2. Drain Coolant: Drain the engine block and exhaust manifold to prevent spills.
3. Remove Elbow: Loosen and remove the bolts securing the exhaust elbow (riser) to the manifold. You may need to gently tap it to break the seal.
4. Clean Surfaces: Thoroughly clean both mating surfaces. Use a gasket scraper to remove all traces of the old gasket and any corrosion or sealant. The surfaces must be clean, flat, and dry.
5. Position New Gasket: Place the new gasket onto the manifold, ensuring it aligns correctly with the bolt holes and water passages. Do not use any sealant unless specified by the engine manufacturer.
6. Reinstall Elbow: Carefully place the exhaust elbow back onto the manifold. Hand-tighten the bolts first to ensure proper alignment.
7. Torque Bolts: Tighten the bolts in a crossing pattern to the manufacturer's recommended torque specifications to ensure even pressure. Do not overtighten.
8. Final Checks: Reconnect the battery, refill the cooling system, and start the engine. Carefully check for any water or exhaust leaks around the gasket.

Troubleshooting & FAQ

Q: How do I know if this is the correct gasket for my engine?

A: This gasket fits MerCruiser V6 and V8 engines made between 1981-1997 with center-rise exhaust manifolds and a standard cooling system. It is a "restrictor" style gasket. Please cross-reference the part numbers (27-863724, 27-41813, 27-860233) and check the compatible models table. If you have a different cooling system (e.g., closed or dry joint), you will need a different gasket.

Q: What are the signs of a failing exhaust elbow gasket?

A: Common symptoms include visible water leaks around the joint between the manifold and elbow, rust stains originating from the joint, engine overheating, or an excessive amount of steam in the engine compartment. Ignoring these can lead to catastrophic engine damage if water enters the cylinders.

Q: What is the difference between this restrictor gasket and a full-flow or blocking gasket?

A: This restrictor gasket has partially open water passages designed for standard (raw water) cooling systems to regulate water flow. A full-flow gasket has wide-open passages, while a blocking gasket has no water passages and is used in specific closed-cooling system applications. Using the wrong type can cause overheating or improper cooling.

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.