Mercury – Quicksilver Distributor Cap | Ignition System Component | Reinforced Polymer with Brass Terminals | 33765T

Overview

A dependable spark makes all the difference on the water. The Mercury Marine 33765T Quicksilver Distributor Cap keeps your ignition system firing clean and even. Built for Marinized GM 6-cylinder inline MerCruiser engines that use Delco conventional ignition, this cap is tough enough for life in a hot, vibrating, salt-filled engine bay. It’s molded from durable reinforced polymer that won’t warp or crack, and its solid brass terminals stay clean and conductive. That means a consistent spark, smoother running, and easier starts every time you turn the key.

Key Features

• Purpose: Routes voltage from the ignition coil to each cylinder in precise firing order.
• Material: Made from a reinforced PBT/PET polymer that resists heat, vibration, and distortion.
• Contacts: Solid brass inserts provide long-lasting conductivity and corrosion resistance.
• Performance: Designed to limit RFI interference that can affect radios or onboard electronics.
• Durability: Rigid yet lightweight construction holds up under marine heat and engine vibration.
• Compatibility: Fits MerCruiser 6-cylinder inline GM-based engines with Delco conventional (non-HEI) ignition systems.

Engine & Boat Compatibility

• Inline 6-cylinder MerCruiser engines built by General Motors.
• Delco conventional ignition systems only.
• Common on classic runabouts, older cruisers, and inboard boats using MerCruiser power.
• Performs reliably in both freshwater and saltwater conditions.

Performance & Practical Benefits

The 33765T cap delivers steady, reliable spark distribution — no crossfire, no hesitation, no misfire. The heat-resistant polymer body holds its shape even after years of heat cycles, keeping the rotor and terminals properly aligned. Inside, brass contacts maintain clean electrical paths and resist corrosion, giving you a strong spark for better fuel burn and smoother running.

You’ll feel the difference right away: faster starts, steady idle, and responsive throttle. The design also minimizes radio interference, so your electronics stay clear and quiet while the motor hums along.

Why Choose OEM

Marine engines live in a harsher world than automotive ones — salt, heat, and vibration test every component. The Quicksilver 33765T is a genuine Mercury OEM part, designed specifically for those conditions. It’s built to the same specs as the original distributor cap used in production, ensuring the perfect fit and dependable performance.

Generic parts often use cheap plastic that warps or aluminum contacts that corrode quickly. Mercury’s materials are marine-rated, tested, and proven to last. It’s the kind of detail that keeps your MerCruiser running strong for years, not just months.

FAQ

Q1: What engines use this cap?
It fits MerCruiser 6-cylinder inline GM-based engines with Delco conventional ignition.

Q2: What’s it made of?
A high-strength polymer body with solid brass terminals that stay clean and conductive.

Q3: Does it help prevent interference?
Yes, it’s designed to reduce radio frequency interference (RFI) for smooth electronic operation.

Q4: Can it handle heat and vibration?
Absolutely — it’s made for the marine environment and resists cracking or warping.

Q5: Why use Mercury OEM instead of aftermarket?
OEM ensures a precise fit, marine-tested materials, and reliable performance you can count on.