Exhaust Elbow Gasket – Fits MerCruiser V6 and V8 Stern Drives (Replaces 27-863726)

Exhaust Elbow Gasket – Fits MerCruiser V6 and V8 Stern Drives (Replaces 27-863726)

This high-quality exhaust elbow gasket is designed for MerCruiser V6 and V8 stern drive engines from 1998–2001 equipped with center rise outlet exhaust manifolds. It provides a reliable seal between the exhaust manifold and the riser or elbow, which is critical for preventing water and exhaust leaks.

This part is a direct replacement for MerCruiser part numbers 27-863726, 27-860232, 27-818832, 27-87105, and 27-871051, as well as several other aftermarket equivalents.

• Material: Constructed from durable graphite to withstand the harsh marine environment.
• Design: Features a completely open, full-flow 4-slot design for standard cooling systems.
• Installation: Installs between the center rise exhaust manifold and the corresponding riser/elbow.

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 (equivalent to 27-863726)
• Note: This listing is for a single gasket. Some applications may require multiple gaskets.

Installation Guide

1. Ensure the engine is turned off and has completely cooled down. Disconnect the battery for safety.
2. If necessary, drain the engine block or manifold to lower the water level below the gasket joint.
3. Carefully unbolt and remove the exhaust riser or elbow from the exhaust manifold.
4. Thoroughly clean the mating surfaces of both the manifold and the riser. Remove all traces of the old gasket material, rust, and corrosion.
5. Inspect both surfaces for flatness, pitting, or warping, as this can prevent a proper seal.
6. Position the new gasket correctly on the manifold, ensuring all bolt holes and exhaust passages align perfectly.
7. Reinstall the exhaust riser/elbow. Hand-tighten the bolts first, then torque them to the manufacturer's recommended specifications in the correct sequence.
8. Reconnect any hoses that were removed and reconnect the battery.
9. Start the engine and carefully check for any signs of water or exhaust leaks around the newly installed gasket.

Troubleshooting & FAQ

Q: How do I know if this gasket will fit my MerCruiser engine?
A: This gasket fits specific MerCruiser V6 (4.3L) and V8 (5.0L, 5.7L, 6.2L, 7.4L, 8.2L) engines from 1998–2001 that use center rise outlet exhaust manifolds. To ensure a perfect match, please consult the "Compatible Engine Models" table on this page and verify your engine's model and serial number range.

Q: What is a "full-flow" gasket and why is it important?
A: This is a completely open, 4-slot gasket designed for "Full Flow" cooling systems, allowing maximum water flow. It is critical that you do not use this gasket on an engine that requires a restricted or blocked-style gasket, as doing so can lead to improper cooling, engine overheating, and severe damage.

Q: What are the common signs of a failing exhaust riser gasket?
A: The most common signs are visible water leaks dripping from the joint between the manifold and riser, rust stains originating from the joint, engine overheating, or a loss of performance. In severe cases, a failed gasket can allow water to enter the engine cylinders, causing catastrophic 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.