# 805759t1 Mercury MerCruiser Distributor cap | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Distributor Cap Kit - Part Number: 805759T1

  

Genuine Quicksilver/MerCruiser distributor cap kit for marinised GM V8 MerCruiser engines using Thunderbolt IV and Thunderbolt V HEI ignition systems. This OEM cap helps maintain correct spark distribution, reliable starting, smooth idle and strong ignition performance in marine petrol engine applications.

  

⚙️ Key Features

  

• Genuine Quicksilver/MerCruiser OEM distributor cap kit

• Designed for marinised GM V8 MerCruiser engines

• Suits Thunderbolt IV and Thunderbolt V HEI ignition systems

• Includes distributor cap and sealing support components where supplied in kit form

• Direct replacement for multiple earlier MerCruiser V8 distributor cap references

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 805759T1 → Supersedes 805759A5

• 805759A5 → Supersedes 805759A2

• 805759A2 → Supersedes 805759A1

• 805759A1 → Supersedes 90746A1

• 90746A1 → Supersedes 16457A4

• 16457A4 → Supersedes 43557A1

• 43557A1 → Supersedes 43557

• 43557 earlier OEM reference

  

OEM / Related Numbers:

  

• 805759T1

• 805759T2

• 805759Q3 related distributor cap and rotor kit reference

• 805759A5

• 805759A2

• 805759A1

• 90746A1

• 16457A4

• 43557A1

• 43557

• JM-71510 related replacement reference

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-5356

• Mallory: 9-29310

• REC: REC805759T1

• JM: JM-71510

• GLM: 71510

• CDI: E64-0010

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser marinised GM V8 petrol engines

• MerCruiser Thunderbolt IV HEI ignition systems

• MerCruiser Thunderbolt V HEI ignition systems

  

Typically suits:

  

• Engine models:

• MerCruiser 350 4BBL Gen Plus Crate Engine, all serials and up, Thunderbolt IV / V V8 distributor cap application

• MerCruiser 350 4BBL Crate Alpha, serial 1G800000 and up

• MerCruiser 350 4BBL Crate Bravo, serial 1G800000 and up

• MerCruiser 350 4BBL Crate Inboard, serial 1G800000 and up

• MerCruiser 350 Alpha 4BBL Crate Engine, all serials and up

• MerCruiser 350 MAG MPI Alpha / Bravo, serial 0L331599 - 0M299999

• MerCruiser 350 MAG MPI Horizon MIE, serial 0L302200 - 0M299999

• MerCruiser 350 MAG MPI MIE, serial 0L302200 - 0M299999

• MerCruiser 350 MAG MPI Ski Gen Plus GM 350 V8, 1998 and newer, serial 0L002600 - 0M310009

• MerCruiser 357 Alpha 4V, serial 1G400000 and up

• MerCruiser 357 MAG Bravo 4V, serial 1G400000 and up

• MerCruiser 357 Stroker Scorpion, serial 1G481121 and up

• MerCruiser 383 MAG Bravo 4V, serial 1G480748 and up

• MerCruiser 383 MAG Inboard 4V, serial 1G400000 and up

• MerCruiser 383 Stroker Scorpion, serial 1G300000 and up

• MerCruiser 383 Stroker Scorpion Bravo, all serials and up

• MerCruiser Black Scorpion 350 MAG MPI, serial 0M391600 - 0W689999

• MerCruiser Black Scorpion MX 6.2L MPI, serial 0M391750 - 0W689999

• MerCruiser Race Stern Drive 320EFI Alpha, model 4320100AH

• MerCruiser Race Stern Drive 320EFI Alpha, model 4501B106H

  

• HP Range: Application dependent across MerCruiser GM V8 petrol engine packages

• Engine Type: MerCruiser GM V8 petrol Thunderbolt IV / Thunderbolt V HEI ignition system

• Year Range: Application dependent by listed engine model, serial range, distributor type and ignition system

  

🔌 Function

  

The distributor cap routes high-voltage spark from the ignition coil to the correct spark plug wire terminal. A clean, dry and correctly fitted cap is essential for stable spark delivery, reliable starting, smooth idle and strong performance under load.

  

Common signs of failure:

  

• Hard starting

• Misfire under load

• Rough idle

• Engine hesitation or backfire

• Visible carbon tracking inside the cap

• Corroded or burnt terminals

• Moisture inside the distributor cap

• Cracked cap body or damaged sealing surface

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 139.5 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 139.50 AUD | In stock |

## Images

- 805759t1 Mercury MerCruiser Distributor cap | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/805759t1-mercury-mercruiser-distributor-cap-genuine-quicksilver-oem-part)
> Updated: 2026-05-17