# 833072004 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver 143°F Thermostat - Part Number: 833072004

  

A genuine Quicksilver 143°F thermostat used on selected Mercury 1.5L 3-cylinder DFI / OptiMax outboards. This thermostat controls cooling water flow through the engine to help maintain correct operating temperature.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM thermostat

• Correct Mercury part number 833072004

• 143°F / 62°C thermostat

• Used on selected Mercury 1.5L 3-cylinder DFI / OptiMax engines

• Direct replacement cooling system service thermostat

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 833072004 current OEM thermostat reference

• 833072003 related thermostat reference

• 833072002 related thermostat reference

  

OEM / Related Numbers:

  

• 833072004

• 833072003

• 833072002

• 833072

• 18-3537 related aftermarket reference

• 18-3536 related aftermarket reference

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-3537

• Sierra: 18-3536

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury 1.5L 3-cylinder DFI / OptiMax cooling system thermostat applications

  

Typically suits:

  

• Engine models:

• Mercury 75 DFI 1.5L 3-cylinder - 2006 and newer, serial 0T980000 and up

• Mercury 75 DFI 1.5L 3-cylinder - serial 0T980000 to 2B112577

• Mercury 90 DFI 1.5L 3-cylinder - 2004 and newer, serial 0T801000 and up

• Mercury 90 DFI 1.5L 3-cylinder - serial 0T801000 to 2B112577

• Mercury 115 DFI 1.5L 3-cylinder - 2004 and newer, serial 0T801000 and up

• Mercury 115 DFI 1.5L 3-cylinder - serial 0T801000 to 2B112577

• Mercury 80 Jet DFI 1.5L 3-cylinder - serial 1B586067 to 2B111840

• Mercury 115 Pro XS 1.5L 3-cylinder applications where 833072004 is specified

• Mercury 125 DFI 1.5L 3-cylinder applications where 833072004 is specified

  

• HP Range: 75HP - 125HP DFI / OptiMax applications where specified

• Engine Type: Mercury 1.5L 3-cylinder DFI / OptiMax outboard

• Temperature Rating: 143°F / 62°C

• System Type: Cooling system thermostat

  

🔌 Function

  

The thermostat controls cooling water flow to maintain proper operating temperature and cooling-system stability.

  

Common signs of failure:

  

• Overheat warning

• Engine runs too cold

• Poor idle or running quality from incorrect temperature

• Thermostat stuck open or closed

• Corrosion or debris in the thermostat housing

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 56.6 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 56.60 AUD | In stock |

## Images

- 833072004 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/833072004-mercury-mercruiser-thermostat-genuine-quicksilver-oem-part)
> Updated: 2026-05-17