Exhaust Elbow Full Flow Gasket – Fits MerCruiser V6 and V8 Engines (Replaces 27-863726)

Exhaust Elbow Full Flow Gasket – Fits MerCruiser V6 and V8 Engines (Replaces 27-863726)

This is an aftermarket exhaust elbow gasket designed for MerCruiser stern drive and inboard engines equipped with center rise outlet exhaust manifolds. It is a standard cooling, full flow, 4-slot gasket that ensures a proper seal between the exhaust manifold and the riser or elbow.

This component directly replaces multiple OEM and aftermarket part numbers, including Mercury/MerCruiser 27-818832, 27-860232, 27-863726, 27-87105, and 27-871051.

• Material: Constructed from high-quality graphite for durability and a reliable seal.
• Application: Specifically designed for Full Flow (Standard Cooling) systems.
• Installation: Fits 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 Full Flow Riser Elbow Gasket (27-863726)

Installation Guide

1. Ensure the engine is completely cool and disconnect the battery terminals.
2. Drain the engine cooling system to prevent spills.
3. Carefully unbolt and remove the exhaust riser (or elbow) from the exhaust manifold.
4. Thoroughly clean both mating surfaces. Use a scraper to remove all traces of the old gasket and any corrosion.
5. Position the new gasket, making sure the 4 slots align correctly with the manifold passages. Do not use any sealant unless specified by the engine manufacturer.
6. Reinstall the exhaust riser, tightening the bolts in a crisscross pattern to the manufacturer's recommended torque specifications.
7. Reconnect all hoses, refill the cooling system, and reconnect the battery.
8. Start the engine and carefully inspect the manifold/riser joint for any water or exhaust leaks.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my engine?

A: Please verify your engine model and year in the compatibility table. This gasket fits MerCruiser V6 and V8 engines (1998–2001) with center rise manifolds. It is a direct replacement for OEM part 27-863726. Ensure your system requires a 4-slot, full-flow gasket, as using the incorrect type can lead to engine damage.

Q: What are the signs that my exhaust gasket is failing?

A: Common symptoms of a bad exhaust gasket include visible water leaks from the joint between the manifold and riser, steam from the engine compartment, engine overheating, or water intrusion into the cylinders (which can cause milky engine oil).

Q: What is the difference between a full-flow and a restricted-flow gasket?

A: This is a full-flow gasket, meaning it has completely open slots for maximum water flow, used in standard cooling systems. A restricted-flow gasket has smaller passages to limit water flow for certain closed-cooling or high-performance applications. Using the wrong one can cause cooling system issues.

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.