Mercury – Exhaust Elbow Gasket | Standard Cooling Series | Composite Marine Seal | 997772

Overview

There’s a kind of quiet trust you develop with the parts that keep your engine breathing. You hear it every time the motor settles into a smooth idle after a long run, or when the exhaust note stays steady as you throttle up toward open water. Out there, you don’t want surprises—you want reliability you can feel. That’s why boaters who know their engines lean on genuine Mercury Marine parts like the 997772 Exhaust Elbow Gasket. It’s a small piece with a big responsibility, sealing in performance so you can focus on the horizon instead of what’s happening under the hatch.

Key Features

• Creates a secure, leak-free seal between the exhaust elbow and manifold
• Built from durable, marine-grade gasket material designed for heat and pressure
• Matches the factory profile for consistent, tight fitment
• Supports standard cooling systems on compatible MerCruiser engines
• Designed to meet Mercury Marine’s original engineering and performance standards

Engine & Boat Compatibility

• Fits MerCruiser 120 engines (1983 and newer)
• Compatible with 140 and 3.0-liter inline engines
• Fits select older V8 small-block MerCruiser engines (1982 and earlier)
• Also compatible with specific V8 engines built by Ford Motor Company
• Ideal for runabouts, cruisers, sterndrive fishing boats, and classic MerCruiser-powered vessels using standard cooling systems

Performance & Practical Benefits

When an exhaust gasket is doing its job, you barely notice it—and that’s exactly how it should be. With the 997772 installed, the seal between the manifold and elbow stays tight and stable, keeping hot exhaust gases where they belong and preventing leaks that can rob power or introduce moisture into vulnerable areas. The engine feels more predictable, with a smoother tone and stronger response when you bring it out of idle.

Under real use—long cruising days, choppy afternoons, or repeated cold starts—the gasket maintains its structure. It cushions against vibration, resists breakdown from heat cycles, and helps your exhaust path stay clean and consistent. That stable, secure connection also protects surrounding components from heat damage and corrosion, extending the life of your engine’s exhaust system. It’s one of those quiet upgrades that gives you confidence every time you drop into gear.

Why Buy OEM

When it comes to exhaust sealing, “close enough” isn’t good enough. A genuine Mercury Marine part like the 997772 is engineered for the exact thickness, pressure, and temperature range your MerCruiser engine demands. Aftermarket versions often vary in material quality, which can lead to early leaks or uneven sealing. With OEM, you’re getting a gasket that fits perfectly the first time and holds up to real marine use—saltwater spray, vibration, heat, and all. It’s a simple, cost-effective way to protect your engine and avoid the headaches that come from inferior parts.

FAQ

Q1: Which engines does the Exhaust Elbow Gasket part number 997772 fit?

It fits select MerCruiser 120, 140, and 3.0-liter engines, as well as certain older V8 models from General Motors and Ford Motor Company.

Q2: What makes this gasket better than aftermarket options?

It uses marine-grade materials matched to Mercury’s exact specifications, ensuring consistent sealing and long-term durability.

Q3: How can I confirm it’s the correct gasket for my engine?

Check your owner’s or service manual, or match your engine’s serial range to the compatibility listed for the 997772.

Q4: Is it suitable for both freshwater and saltwater use?

Yes, it’s designed to hold up in any marine environment when installed on a standard cooling system.

Q5: Is installation straightforward for most boat owners?

Yes. With the proper torque specs and basic tools, installation is simple. Always follow your service manual for best results.