QUICKSILVER 90747A28 Thunderbolt Distributor Nos 4.3 V6 805185A37

( Brand: Quicksilver ), ( Manufacturer Part Number: 90747A28 ), ( Part Type: Distributor )

Review QUICKSILVER Mercury Thunderbolt 4.3 Liter V6 Distributor Nos fits MERCRUISER

The **Quicksilver 90747A28 Mercury Mercruiser Thunderbolt 4.3L V6 Distributor (OEM Part #805185A37, New Old Stock)** is a meticulously preserved, high-performance ignition component designed exclusively for Mercury s legendary Thunderbolt outboard engines, specifically the 4.3-liter V6 series. This distributor represents the pinnacle of marine ignition technology, engineered to deliver precise spark timing, optimal fuel efficiency, and reliable performance under the demanding conditions of saltwater and high-load operation. Crafted from durable, corrosion-resistant materials, the distributor features a robust internal mechanism, including a high-quality coil and a precision-ground camshaft, ensuring consistent ignition pulses even after prolonged use. The unit is fully compatible with the Thunderbolt s advanced fuel injection system, providing seamless integration with the engine s electronic control module (ECM) for accurate spark advance and idle stability. Whether installed in a high-performance cruiser, a fishing vessel, or a recreational powerboat, this NOS (New Old Stock) distributor guarantees the same dependable performance as when it was originally manufactured, with the added advantage of being sourced from a trusted inventory of pre-owned, high-quality components. Its inclusion in your engine s ignition system will not only restore or maintain peak engine performance but also extend the lifespan of critical components by minimizing misfires and ensuring smooth combustion. Ideal for restorers, mechanics, and enthusiasts seeking genuine OEM parts, this distributor is a testament to Mercury s engineering excellence and a crucial element for preserving the integrity of your Thunderbolt s power delivery.

### **Pros and Cons of Buying a Used Mercury Mercruiser Thunderbolt 4.3L V6 (Distributor Ignition, NOS)**

The 4.3L V6 Thunderbolt engine is known for its strong torque and reliable performance, making it suitable for medium to large boats. It delivers adequate power for cruising, fishing, and light planing, especially when properly maintained.

Mercury s 4.3L V6 engines are built with a reputation for durability, particularly when they have been well-maintained. Many units with low hours can still have significant life left if the engine has been properly serviced.

The 4.3L Thunderbolt is a well-documented engine with a wide range of aftermarket parts available, including performance upgrades, fuel systems, and ignition components. This makes repairs and modifications easier compared to less common engines.

Compared to larger V8 engines, the 4.3L V6 is more fuel-efficient, which can be beneficial for long cruising trips or frequent use.

While modern coil-on-plug (COP) ignition systems are more reliable, distributor-based systems can still function well if maintained. Some buyers prefer the simplicity of distributor ignition for basic setups.

If the engine is in rough shape, it can often be restored to good condition with proper mechanical work. Many NOS (New Old Stock) engines are stripped-down but structurally sound, allowing for a fresh rebuild.

Compared to newer Mercury engines or outboard motors, a used NOS 4.3L V6 can be significantly cheaper, making it an attractive option for budget-conscious buyers.

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The engine is from an older generation (likely late 1990s to early 2000s), meaning it may have accumulated wear over time. Key components like timing belts, water pumps, and seals may need replacement soon, even if the engine is NOS.

Distributor-based ignition systems are more prone to failure compared to modern COP systems. They require regular maintenance (e.g., distributor cap and rotor replacement) and can be less reliable in harsh marine environments.

Older engines may not meet current emissions standards if used in certain regions or for specific applications. Some states or countries require updated emissions systems, which could require modifications.

The carbureted or early fuel-injected versions of this engine may struggle with modern fuel formulations. Ethanol blends can cause corrosion and performance issues, requiring additional maintenance or upgrades (e.g., ethanol-resistant parts).

Since this is a used NOS engine, it will not come with a warranty from Mercury. Buyers will need to rely on their own mechanical skills or a trusted mechanic for repairs.

While aftermarket parts exist, some original Mercury components may be harder to find over time. Pricing for rare parts can also be higher than for newer engines.

NOS engines are often sold stripped down, meaning buyers must inspect critical components (block, crankshaft, rods, pistons, etc.) thoroughly. A poorly maintained engine could require expensive repairs.

The 4.3L Thunderbolt is not a high-demand engine in the used market, so resale value will likely be low compared to newer or more popular Mercury engines.

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Buying a used Mercury Mercruiser Thunderbolt 4.3L V6 (distributor ignition, NOS) can be a cost-effective choice if you are looking for a reliable, mid-sized engine for a boat that doesn t require extreme performance. The engine s strength and aftermarket support make it a viable option for cruising, fishing, or light planing, provided it is thoroughly inspected and maintained. However, the age of the engine, distributor ignition limitations, and potential for hidden issues mean that buyers must be prepared for maintenance costs and possible upgrades.

If you are mechanically inclined or have access to a trusted mechanic, this engine could be a good project. For those seeking a hassle-free, modern solution, a newer Mercury outboard or inboard engine with COP ignition and emissions compliance would be a safer bet.

- **Buy if:** You have experience with marine engines, are willing to invest in maintenance, and need a reliable mid-sized engine for a boat where top-tier performance isn t critical.

- **Avoid if:** You want a low-maintenance, warranty-backed engine or plan to use the boat frequently without mechanical support.

- **Consider alternatives:** If budget allows, look for a newer Mercury 4.6L V8 or a well-maintained 4.3L V6 with COP ignition. If cost is a priority, ensure the NOS engine is professionally inspected before purchase.

Always run a **pre-purchase inspection** and verify the engine s service history to avoid costly surprises.

Details:

This part was originally #90747A28, it is now 805185A37 Brand New Old Stock. Has been on shelf for years.

part #: 90747a28 prices

• $149.99-$400.00

specifications ouboaen:

• for models: Mercruiser
• for makes: Mercury
• brand: Quicksilver
• mpn: 90747a28
• part type: Distributor

seller ouboaen:

• rating: 100.0%
• city: Babylon, New York
• # reviews: 20

general ouboaen:

• condition: New other see details
• Boat Parts > Outboard Engines Components > Other

shipping ouboaen:

• service: UPS Ground
• type: Calculated
• cost: $17.62
• carrier: UPS
• transit: 4-9 Days
• class: Standard

payments ouboaen:

• other
• credit card: Visa
• wallet: Apple-pay

returns ouboaen:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer ouboaen:

• sold: 0
• availability: In Stock
• quantity: 1
• started: February 26, 2026
• options: Ship-to-home

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