# 855676003 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver FourStroke Thermostat - Part Number: 855676003

  

A genuine Quicksilver thermostat for selected Mercury and Mariner FourStroke outboards. This thermostat is part of the 855676 / 825212 thermostat family and helps control operating temperature in small and mid-range FourStroke cooling systems.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM thermostat

• Correct Mercury part number 855676003

• Common 60°C / 140°F FourStroke thermostat application

• Related to 825212001, 825212T02 and 855676A1 references

• Used across selected Mercury / Mariner 13.5HP to 50HP FourStroke models, with additional FourStroke applications where specified

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 855676003 current thermostat service reference

• 855676A1 related thermostat kit reference

• 825212001 related OEM thermostat reference

• 825212T02 related service reference

• 855676 earlier OEM reference

  

OEM / Related Numbers:

  

• 855676003

• 855676

• 855676A1

• 825212001

• 825212

• 825212T02

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-3642

• Recmar: REC825212T02

• Yamaha equivalent family: 6G8-12411-00 / 6G8-12411-01

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner FourStroke cooling system thermostat applications

  

Typically suits:

  

• Engine models:

• Mercury / Mariner 13.5HP FourStroke International applications where 855676003 is specified

• Mercury / Mariner 15HP FourStroke applications where 855676003 is specified

• Mercury / Mariner 25HP FourStroke applications where 855676003 is specified

• Mercury / Mariner 30HP FourStroke - USA serial 0G760300 to 1B226999

• Mercury / Mariner 30HP FourStroke - Belgium serial 0P017000 to 0P400999

• Mercury / Mariner 40HP FourStroke - USA serial 0G231123 and up

• Mercury / Mariner 40HP FourStroke - Belgium serial 0P017000 and up

• Mercury / Mariner 40HP 3-cylinder FourStroke - serial 1C049739 and up where specified

• Mercury / Mariner 45HP FourStroke applications where 855676003 is specified

• Mercury / Mariner 50HP FourStroke - USA serial 0G231123 to 0T178499

• Mercury / Mariner 40HP, 50HP and 60HP EFI FourStroke applications where the 855676003 thermostat family is specified

  

• HP Range: 13.5HP - 60HP primary FourStroke range, with additional FourStroke applications where specified

• Engine Type: Mercury / Mariner FourStroke outboard

• Temperature Rating: commonly 60°C / 140°F thermostat family

  

🔌 Function

  

The thermostat opens and closes with engine temperature to regulate cooling water flow and maintain stable engine operating temperature.

  

Common signs of failure:

  

• Overheating

• Engine running too cold

• Poor warm-up or idle quality

• Temperature warning

• Thermostat stuck, corroded or blocked by debris

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 44.0 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 44.00 AUD | In stock |

## Images

- 855676003 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/855676003-mercury-mercruiser-thermostat-genuine-quicksilver-oem-part)
> Updated: 2026-05-17