Mercury – Exhaust Elbow Gasket | Dry Joint Full Flow | Marine Composite | 864547A02

Overview

Every boater knows that a smooth-running engine is more than just horsepower and throttle response—it’s about trust. Trust that when you fire up your MerCruiser, everything inside is sealed, aligned, and ready to take you wherever the day leads. The Mercury Marine 864547A02 Exhaust Elbow Gasket is one of those small, quiet heroes that keeps your exhaust system breathing cleanly and your outings free from surprises. It’s built for the dry joint exhaust manifolds found on newer V6 and V8 MerCruiser engines, and it gives you the kind of peace of mind you only get from a part designed to fit perfectly the first time.

Key Features

• Full flow style exhaust elbow gasket for efficient exhaust movement
• Compatible with select 2002 and newer V6 and V8 MerCruiser sterndrive and inboard engines
• Designed specifically for dry joint exhaust manifold systems
• Manufactured to Mercury Marine’s original equipment specifications
• Engineered for long-term heat resistance and dependable sealing
• Straightforward installation using standard tools
• Helps maintain proper exhaust temperature, flow, and system integrity

Engine & Boat Compatibility

• Fits select MerCruiser V6 and V8 engines equipped with dry joint exhaust manifolds
• Compatible with sterndrive and inboard configurations
• Common on bowriders, cruisers, runabouts, tow-sport boats, and offshore fishing vessels
• Suitable for engines used in both recreational and light commercial marine environments

Performance & Practical Benefits

On the water, exhaust components take a beating—heat cycles, vibration, pressure, moisture, and constant motion. This full flow gasket is built to hold its seal through all of it. Once installed, it creates a tight and reliable interface between your elbow and manifold, helping maintain smooth exhaust flow and stable temperatures throughout your system.

That tight, confident seal translates directly into how your engine feels. The idle is steadier. The tone is cleaner. You’ll notice fewer harsh smells and no unexpected weeping around the elbow flange. Installation is uncomplicated, and once torqued down, the gasket sits flat and secure, resisting blowouts and leaks that cheaper aftermarket versions often struggle with.

It’s the kind of part you install once and don’t think about again—exactly what most of us want from a gasket buried in the heart of our exhaust system.

Why Buy OEM

There’s a reason seasoned boaters stick with OEM for exhaust components: the fit.

• Mercury Marine parts match the engine’s exact dimensions and bolt patterns
• Composite materials are chosen for marine heat and moisture, not repurposed from automotive stock
• Longer service life, fewer re-torques, and fewer failure points
• Helps maintain factory exhaust performance and protects against overheating
• Gives you confidence on long runs, heavy tow days, and hot summer idling

OEM simply gives you the longevity and reliability that keeps small problems from turning into big ones.

FAQ

Q1: Which engines does the 864547A02 gasket fit?

It fits select 2002 and newer MerCruiser V6 and V8 engines with dry joint exhaust manifolds.

Q2: What makes this gasket different from aftermarket versions?

It’s engineered specifically for Mercury’s dry joint design, ensuring a precise seal, exact flow path, and long-term reliability.

Q3: How do I confirm this is the right gasket for my setup?

Check your engine’s serial number and verify that you have a dry joint exhaust manifold system. If so, this is likely your correct replacement.

Q4: Can it be used in both saltwater and freshwater?

Absolutely. It’s built to handle heat, moisture, and corrosion concerns in both environments.

Q5: Is installation straightforward?

Yes. With common hand tools and basic mechanical comfort, most boaters can replace this gasket themselves.