Mercury – Distributor Cap | Prestolite Ignition System | Marine-Grade Polymer | 9766Q1

Overview

There’s a certain comfort that comes from turning the key on a V8 MerCruiser and hearing it fire up clean and strong. No coughing, no hesitation—just that familiar rumble that tells you your boat’s ready for another long run. The Quicksilver 9766Q1 Distributor Cap helps keep that confidence alive. It’s one of those quiet, behind-the-scenes parts that holds everything together, routing spark where it needs to go and keeping your engine’s heartbeat steady whether you’re cruising wide open or easing toward the dock at sunset.

Key Features

• Designed for Prestolite conventional ignition systems on V8 MerCruiser engines
• High-strength PBT/PET polymer blend for rigidity and resistance to warpage
• Solid brass inserts to fight corrosion and minimize electrical pitting
• Engineered to reduce RFI interference with onboard electronics
• Excellent strength-to-weight ratio for durability in hot, demanding engine bays
• Meets Mercury Marine OEM specifications for precise fit and long service life

Engine & Boat Compatibility

This Mercury Marine part is compatible with a range of marinized General Motors–based V8 MerCruiser engines, often found on:

• Runabouts and bowriders
• Classic sterndrive cruisers
• Tow-sport and waterski boats
• Small offshore and near-shore fishing boats

If your vessel runs a GM-built V8 MerCruiser with a Prestolite conventional ignition, this cap is designed for your system.

Performance & Practical Benefits

A distributor cap isn’t something most boaters think about—until the engine starts missing under load or stumbling during acceleration. When a cap ages, moisture, heat, and corrosion begin to take their toll. That’s when you feel those uneven pulses instead of the smooth, steady pull your V8 is capable of.

Installing the Quicksilver 9766Q1 restores that confidence by providing:

• Clean, consistent spark delivery, reducing misfires and sluggish throttle response
• A tight, dependable fit, keeping internal components protected from moisture and salt intrusion
• Smooth idle and powerful acceleration, even in demanding conditions
• Better longevity, thanks to corrosion-resistant brass and reinforced polymer

You can feel the difference on the water—no more second-guessing your ignition when you punch the throttle to clear a swell or steady the boat for a skier.

Why Buy OEM

When it comes to ignition components, small imperfections create big problems. That’s why seasoned boaters stick with OEM Mercury Marine parts:

• Built to the exact tolerances your MerCruiser V8 requires
• Less risk of premature corrosion, cracking, or electrical bleed-over
• Designed and tested specifically for the harsh marine environment
• Provides better long-term value by lasting longer and protecting the rest of the ignition system
• Ensures your engine performs the way the manufacturer intended

It’s the kind of part you install once, trust fully, and forget about—exactly how it should be.

FAQ Section

Q1: Which Mercury engines does this distributor cap fit?

It fits V8 MerCruiser engines built by General Motors using Prestolite conventional ignition systems.

Q2: What sets it apart from aftermarket versions?

OEM materials, tighter tolerances, and brass inserts designed for marine corrosion resistance.

Q3: How do I confirm it fits my engine?

Match your serial number and ignition system details with your owner’s or service manual.

Q4: Is it suitable for both saltwater and freshwater?

Yes—its materials are engineered for harsh marine environments.

Q5: Is installation straightforward?

Most boat owners can replace a distributor cap with basic tools and careful labeling of plug wires.