Quicksilver – Dry Joint Exhaust Elbow | MerCruiser V6 & V8 Series | Hot-Dipped & Powder-Coated Cast Iron | 864591T02

Overview

There is a certain calm that washes over you when your engine settles into a steady rumble — no ticks, no hot spots, just that smooth rhythm that tells you everything beneath the hatch is working the way it should. A good exhaust elbow plays a big part in that confidence. When you’re running a MerCruiser V6 or V8, especially one that’s been with you through a lot of long days on the water, you want parts that feel solid, dependable, and ready for real marine life. This Mercury Marine part brings that kind of reassurance the moment you hold it. It’s the kind of component you trust automatically.

Key Features

• Replacement dry joint exhaust elbow for MerCruiser V6 and V8 engines.
• Four-inch outside diameter with a fourteen-degree down-angle outlet.
• Hot dipped and powder coated for corrosion resistance.
• Built from durable cast iron for long-term reliability.
• Designed to meet Mercury Marine OEM exhaust specifications.
• Mercury Marine part number 864591T02.

Engine & Boat Compatibility

• Fits V6 and V8 MerCruiser sterndrive engines made by General Motors (2004 and newer; serial number 0W310000 and up).
• Fits V8 MerCruiser inboard engines made by General Motors (2002 and newer; serial number 0M317000 and up).
• Ideal for cruisers, bowriders, performance boats, runabouts, and family weekenders.
• Suitable for both freshwater and coastal operation.

Performance & Practical Benefits

A well-sealed elbow changes the entire personality of a marine engine. With this dry joint design, you’ll notice quieter operation, tighter temperature control, and a smoother response when you throttle up. The water stays where it’s supposed to, the exhaust flows cleanly, and the engine breathes with a steadiness that’s hard to miss.

The cast iron feels substantial — the kind of weight that speaks to durability. The hot-dipped and powder-coated finish adds another layer of protection, guarding the elbow against rust, scaling, and the long-term wear that comes from salt spray or humid engine compartments. The installation process is predictable: the bolt holes line up cleanly, the joint seats the way it should, and you’re not fighting misalignment the way you often do with aftermarket parts.

Once installed, the difference is immediate. The elbow holds steady under heat, avoids the weeping and moisture intrusion that dry joint systems are designed to prevent, and keeps your motor running cooler for longer. For many boaters, this part brings back the confidence the engine had when it was new — and that’s a feeling worth preserving.

Why Buy OEM

Dry joint exhaust systems aren’t the place to gamble. Aftermarket elbows often miss the small details — internal passage size, coating thickness, bolt-hole accuracy — that keep water and exhaust separated properly. A misfit or poorly cast elbow can lead to leaks, corrosion, or even catastrophic water intrusion.

With this genuine Mercury Marine part, you’re buying exact fitment, predictable performance, and protection backed by the same engineering that built your MerCruiser engine. It’s simply the practical choice for boaters who want long-term reliability without the guesswork.

FAQ

Q1: Which engines does this exhaust elbow fit?

It fits select V6 and V8 MerCruiser sterndrive and inboard engines with dry joint exhaust systems.

Q2: What makes it better than aftermarket elbows?

OEM casting quality, corrosion protection, and precise fitment that prevents leaks and premature wear.

Q3: How do I know this is the correct replacement?

Check your serial number. If your engine uses a dry joint elbow and calls for part number 864591T02, this is the correct match.

Q4: Can it be used in saltwater and freshwater?

Yes — the hot-dipped and powder-coated finish protects it in both environments.

Q5: Is installation straightforward?

For most mechanically experienced boat owners or technicians, yes. The fitment is clean and predictable.