# 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Lower Unit Gearcase Seal Kit - Part Number: 26-43035A4

  

Genuine Quicksilver gearcase seal kit used on Mercury and Mariner 40HP to 125HP lower units. This kit is used for complete lower-unit reseal service on selected 40-60HP BigFoot, 75-90HP 3-cylinder and 100-125HP 4-cylinder outboards where the gearcase matches the 26-43035A4 seal kit family.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM lower-unit seal kit

• Correct Mercury part number 26-43035A4

• Supersedes earlier 26-43035A3 / A2 / A1 seal kit references

• Used for gearcase reseal service

• Covers prop shaft, driveshaft and shift shaft sealing components in supported gearcases

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 26-43035A4 current OEM seal kit reference

• 26-43035A3 earlier related seal kit reference

• 26-43035A2 earlier related seal kit reference

• 26-43035A1 earlier seal kit reference

  

OEM / Related Numbers:

  

• 26-43035A4

• 43035A4

• 2643035A4

• 26-43035A3

• 43035A3

• 26-43035A2

• 26-43035A1

• Lower-unit seal kit

• Gearcase seal kit

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-2626

• Recmar lower-unit seal kit equivalents for 26-43035A4 applications

• WSM gearcase seal kit equivalents for Mercury / Mariner 40HP to 125HP applications

• Aftermarket 26-43035A4 seal kits for 40-60HP BigFoot, 75-90HP and 100-125HP gearcases

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner 40HP to 60HP BigFoot gearcases

• Mercury / Mariner 75HP to 90HP 3-cylinder gearcases

• Mercury / Mariner 100HP to 125HP 4-cylinder gearcases

• Lower-unit reseal work after water intrusion or pressure test failure

  

Typically suits:

  

• Engine models:

• Mercury / Mariner 40HP to 60HP 2-stroke BigFoot - 1988-2016 where gearcase uses kit 26-43035A4

• Mercury / Mariner 40HP to 60HP 4-stroke BigFoot - 1988-2016 where specified

• Mercury / Mariner 75HP 3-cylinder 2-stroke / 4-stroke - 1988-2016 where specified

• Mercury / Mariner 80HP 3-cylinder applications where specified

• Mercury / Mariner 90HP 3-cylinder 2-stroke / 4-stroke - 1988-2016 where specified

• Mercury / Mariner 100HP 4-cylinder applications where specified

• Mercury / Mariner 115HP 4-cylinder 2-stroke / 4-stroke - 1988-2016 where specified

• Mercury / Mariner 125HP 4-cylinder applications where specified

• Mercury / Mariner 100HP / 115HP / 125HP 2-cycle outboards - USA serial 0B209468 and newer where specified

• Belgium-built 100HP / 115HP / 125HP applications - serial 9523034 and matching gearcase families where specified

  

• HP Range: commonly 40HP - 125HP where specified

• Engine Type: Mercury / Mariner outboard gearcase

• System Type: Lower-unit / gearcase seal kit

  

🔌 Function

  

The seal kit restores the lower-unit sealing system, keeping gear oil in and water out around prop shaft, driveshaft and shift shaft seal areas.

  

Common signs of failure:

  

• Milky gear oil

• Gear oil leaking from prop shaft or driveshaft area

• Failed lower-unit pressure or vacuum test

• Fishing line damage behind propeller

• Lower unit opened for bearing or gear service

• Complete reseal required after water intrusion

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 155.76 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 155.76 AUD | In stock |

## Images

- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part
- 2643035A4 Mercury MerCruiser Seal Kit | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/2643035a4-mercury-mercruiser-seal-kit-genuine-quicksilver-oem-part)
> Updated: 2026-07-18