Mercury – Exhaust Elbow Gasket (Full Flow) | Cooling & Exhaust System | Marine Composite | 863726

Overview

There are parts you install and forget about, and then there are parts you trust because you know exactly what they do for your engine. A full flow exhaust elbow gasket is one of those unsung heroes. When you are heading out at first light or easing back toward the marina after a long, windy run, you want the exhaust and cooling system working together smoothly. This Mercury Marine part brings back that steady confidence—the kind that makes the boat feel solid under your feet and the engine breathe the way it should.

Key Features

• Full flow, four-slot exhaust elbow gasket for standard cooling systems
• Designed for V6 and V8 General Motors–based MerCruiser engines
• Marine-grade composite material built to resist heat, moisture, and vibration
• Matches the original Mercury factory gasket for reliable fitment
• Supports proper exhaust flow and stable cooling water passage
• Manufactured to Mercury Marine OEM standards for durability and consistency

Engine & Boat Compatibility

• Fits MerCruiser V6 and V8 sterndrive and inboard engines (1998–2001)
• Works with center rise outlet exhaust manifolds
• Commonly found on cruisers, bowriders, fishing boats, sport boats, and family runabouts
• Designed for standard, raw-water cooling systems

Performance & Practical Benefits

A full flow gasket does more than seal two metal surfaces—it controls how water and exhaust move together through a hot, high-demand part of the engine. With the right gasket in place, you get a steady flow path that helps prevent hotspots, moisture intrusion, and exhaust turbulence. That translates into smoother idling, predictable temperatures, and longer life for manifolds and elbows.

When you tighten down this gasket, you will appreciate how cleanly it seats. There is no fighting with misalignment or wondering if it will hold. Once torqued, it creates a secure, uniform seal that stands up to long weekends, frequent engine cycles, and the constant shaking that happens every minute on the water. It is one of those parts that immediately restores trust in the system—quiet, steady, dependable. And when you know the gasket is right, you stop thinking about it entirely and just enjoy the ride.

Why Buy OEM

Experienced boaters often learn the hard way that a gasket is not “just a gasket.” An aftermarket option can fail early, leak, or distort from heat. With an OEM Mercury Marine part, you know exactly what you are getting:

• A precise fit developed specifically for your MerCruiser manifolds and elbows
• Materials chosen and tested for real marine temperatures and vibration
• Easy installation with no trimming or improvising
• Longer service life, making it a more cost-effective choice
• Peace of mind every time you turn the key

When it comes to cooling and exhaust components, OEM quality is not a luxury—it is the practical choice that saves time, protects the engine, and keeps you on the water.

FAQ

Q1: Which engines does the Exhaust Elbow Gasket 863726 fit?

It fits select V6 and V8 MerCruiser sterndrive and inboard engines built between 1998 and 2001 with center rise manifolds.

Q2: What makes this gasket different from aftermarket versions?

This is the genuine full flow, four-slot design with OEM-matched sealing material engineered for the heat and vibration of marine use.

Q3: How do I know it is the right replacement for my setup?

Check your model year, cooling system type (standard cooling), and manifold style. Your owner’s manual will confirm the part number.

Q4: Can this gasket be used in both saltwater and freshwater environments?

Yes. The marine composite material is built for both, as long as the engine is maintained properly.

Q5: Is installation simple for most boat owners?

If you are comfortable removing the elbow and cleaning the surfaces, installation is straightforward. Just follow proper torque steps.