# 27430075 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Powerhead Base Gasket - Part Number: 27-430075

  

A genuine Quicksilver powerhead base gasket for selected Mercury and Mariner 3-cylinder and 4-cylinder outboards. This gasket seals the cylinder block / powerhead to the mounting plate and is used on 75HP, 80HP, 90HP, 100HP, 115HP, 125HP and 1.5L DFI applications where the serial-numbered diagram specifies 27-430075.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM powerhead base gasket

• Correct Mercury part number 27-430075

• Supersedes earlier 27-430073 and 27-43007 references

• Used on 3-cylinder and 4-cylinder Mercury / Mariner powerhead base applications

• Cross-referenced with Sierra 18-0670, GLM 32830 and Mallory 9-60043

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 27-430075 → Supersedes 27-430073

• 27-430073 → Supersedes / relates to 27-43007

• 27-43007 earlier OEM powerhead base gasket reference

  

OEM / Related Numbers:

  

• 27-430075

• 430075

• 27430075

• 27-430073

• 430073

• 27-43007

• 43007

• 27-43007-5 formatted aftermarket reference

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-0670

• GLM: 32830

• Mallory: 9-60043

• Recmar: REC27-430075

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner 3-cylinder and 4-cylinder powerhead base gasket applications

• Mercury 75HP / 90HP / 115HP 1.5L DFI gasket set components

  

Typically suits:

  

• Engine models:

• Mercury 70HP 3-cylinder - serial 0A996142 to 0B240450

• Mercury 70HP 3-cylinder - serial 0B240451 to 0C221999

• Mercury 75HP 3-cylinder - serial 0A996142 to 0B240450

• Mercury 75HP 3-cylinder - serial 0B240451 to 0C221999

• Mercury 75HP 3-cylinder - serial 0C222000 to 0D283221

• Mercury 75HP 3-cylinder - serial 0D283222 to 0G760299

• Mercury 75HP 3-cylinder - serial 0G760300 to 0T979999

• Mercury 80HP 3-cylinder - serial 0A996142 to 0B240450

• Mercury 80HP 3-cylinder - serial 0B240451 to 0C221999

• Mercury 90HP 3-cylinder - serial 0A996142 to 0B240450

• Mercury 90HP 3-cylinder - serial 0B240451 to 0C221999

• Mercury 90HP 3-cylinder - serial 0C222000 to 0D283221

• Mercury 90HP 3-cylinder - serial 0D283222 to 0G760299

• Mercury 90HP 3-cylinder - serial 0G760300 to 0T979999

• Mercury 100HP 4-cylinder 2-stroke powerhead base applications where 27-430075 is specified

• Mercury 115HP 4-cylinder - serial 0C100000 to 0D283221

• Mercury 115HP 4-cylinder - serial 0D283222 to 0G760299

• Mercury 115HP 4-cylinder - serial 0G760300 to 0T979999

• Mercury 125HP 4-cylinder 2-stroke powerhead base applications where 27-430075 is specified

• Mercury 75HP DFI 1.5L 3-cylinder gasket set components where 27-430075 is specified

• Mercury 90HP DFI 1.5L 3-cylinder gasket set components where 27-430075 is specified

• Mercury 115HP DFI 1.5L 3-cylinder gasket set components where 27-430075 is specified

  

• HP Range: commonly 70HP - 125HP, plus 75HP / 90HP / 115HP 1.5L DFI where specified

• Engine Type: Mercury / Mariner 3-cylinder, 4-cylinder and 1.5L DFI outboard

• System Type: Powerhead base / cylinder block to mounting plate gasket

  

🔌 Function

  

The gasket seals the powerhead to the mounting plate, helping prevent exhaust leakage, water leakage and crankcase / midsection contamination at the base joint.

  

Common signs of failure:

  

• Water or exhaust leakage at powerhead base

• Salt build-up around base gasket surface

• Exhaust noise from midsection area

• Gasket damaged during powerhead removal

• Replacement required whenever the powerhead is lifted

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 22.7 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 22.70 AUD | In stock |

## Images

- 27430075 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/27430075-mercury-mercruiser-gasket-genuine-quicksilver-oem-part)
> Updated: 2026-05-17