Mercury – Quicksilver Distributor Assembly | For V8 MerCruiser Engines with Thunderbolt IV & V Systems | 805185A36

Overview

A strong spark means a strong engine, and the Mercury Marine 805185A36 Quicksilver Distributor Assembly keeps your ignition system delivering just that. Designed for marinized V8 MerCruiser engines built by General Motors, this complete distributor kit supports Thunderbolt IV and V ignition systems — restoring crisp starts, smooth idle, and steady power. Built from durable, marine-grade materials, it’s engineered to resist heat, vibration, and corrosion, so your engine performs reliably in the harshest on-water environments.

Key Features

• Purpose: Provides accurate spark timing and strong ignition performance for V8 MerCruiser engines.
• Complete Kit: Includes distributor housing, cap, rotor, and lead wires — everything needed for replacement.
• Construction: Cap made from PBT and PET plastic blend for superior strength and resistance to warping.
• Performance: Delivers reliable spark distribution for cleaner combustion and smoother operation.
• Durability: Built to withstand marine heat and vibration without cracking or misfiring.

Engine & Boat Compatibility

• V8 MerCruiser sterndrive and inboard engines built by General Motors
• Designed for Thunderbolt IV and Thunderbolt V ignition systems

Performance & Real-World Benefits

The 805185A36 distributor assembly is a direct replacement designed to bring back the reliable ignition performance your V8 MerCruiser was built for. Over time, heat and corrosion can cause caps to warp and contacts to degrade, leading to misfires or hard starts. This OEM kit replaces the entire assembly with precision-engineered components, ensuring even spark distribution across all cylinders.

Its high-strength materials handle marine temperatures and vibration without cracking or losing conductivity. The result: easier starts, smoother running at idle, and dependable power when you need it most.

Why Choose Mercury OEM

The Quicksilver 805185A36 is a genuine Mercury Marine replacement, built to factory standards for exact timing and performance. Aftermarket distributors often use cheaper materials or looser tolerances, which can throw off ignition timing or fail prematurely.

Mercury’s OEM design is tested under real-world marine conditions — from high-humidity saltwater to long, hot runs — ensuring reliable spark and maximum efficiency. It’s the same distributor trusted by Mercury service technicians for factory-level ignition repair.

FAQ

Q1: What engines does this fit?
It fits marinized V8 MerCruiser sterndrive and inboard engines with Thunderbolt IV or V ignition systems.

Q2: What’s included in the kit?
You’ll get the distributor housing, cap, rotor, and lead wires — all ready to install.

Q3: What’s special about the cap construction?
It’s made from a blend of PBT and PET plastics that resist heat, warping, and cracking.

Q4: Is installation straightforward?
Yes — it’s a direct-fit OEM assembly that replaces your existing distributor with no modifications.

Q5: Why OEM instead of aftermarket?
Because Mercury OEM parts deliver factory-level fit, precise timing, and long-term reliability — everything your ignition system depends on.