# 8M0109441 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part

## 🔧 Product Description

**Genuine Quicksilver 160°F MerCruiser Thermostat - Part Number: 8M0109441**

Genuine Quicksilver 160°F thermostat for MerCruiser GM petrol engines with standard cooling systems. This thermostat replaces earlier Mercury 8M0091470, 807252T2, 8072522 and 8052732 references and is used on selected MerCruiser 3.0L, 4.3L, 5.0L, 5.7L, 6.2L and 7.4L engines where the cooling system specifies a 160°F thermostat.

## ⚙️ Key Features

-   Genuine Quicksilver OEM thermostat
-   Correct Mercury part number 8M0109441
-   160°F / 71°C opening temperature
-   Standard cooling MerCruiser thermostat application
-   Supersedes 8M0091470, 807252T2, 8072522 and 8052732
-   Used with matching thermostat gasket and housing sleeve where specified

## 🚤 Compatibility

### Commonly used on

-   MerCruiser GM petrol engines with standard cooling
-   MerCruiser inline 4, V6 and V8 thermostat housings
-   Standard-cooling applications requiring a 160°F thermostat

### Typically suits

-   Engine models:
-   MerCruiser 3.0L GM 181 inline 4-cylinder standard cooling applications where 8M0109441 is specified
-   MerCruiser 3.0LX GM 181 inline 4-cylinder applications where specified
-   MerCruiser 4.3L GM V6 carburetted applications requiring 160°F thermostat
-   MerCruiser 4.3LX GM V6 applications where specified
-   MerCruiser 4.3L EFI / MPI Alpha / Bravo applications requiring 160°F thermostat
-   MerCruiser 5.0L GM 305 V8 carburetted / EFI / MPI applications where specified
-   MerCruiser 5.7L GM 350 V8 carburetted / EFI / MPI applications where specified
-   MerCruiser 350 MAG standard cooling applications where 160°F thermostat is specified
-   MerCruiser 350 MAG MPI Alpha / Bravo standard cooling applications where specified
-   MerCruiser MX 6.2L MPI Bravo standard cooling applications where specified
-   MerCruiser 7.4L / 454 MAG / 454 EFI applications requiring 160°F thermostat
-   Common Serial Families:
-   MerCruiser 3.0L late Alpha applications: 0F603000 and up where 160°F thermostat is specified
-   MerCruiser 4.3L Gen+ / MPI applications: 0F803000 and up where specified
-   MerCruiser 5.0L / 5.7L Gen+ applications: 0F601000 and up where specified
-   MerCruiser 350 MAG / MPI applications: 0L010041 and up where specified
-   MerCruiser 6.2L MPI applications: 0M300000 and up where specified
-   Engine Type: MerCruiser GM petrol inline 4, V6 and V8
-   System Type: Engine cooling thermostat
-   Temperature Rating: 160°F / 71°C

## 🔌 Function

The thermostat regulates engine operating temperature by restricting cooling flow while cold and opening as the engine reaches operating temperature. Correct thermostat temperature is important for fuel efficiency, idle quality and engine protection.

## ⚠️ Common Signs of Failure

-   Engine running too cold
-   Engine overheating
-   Temperature gauge fluctuating
-   Thermostat stuck open or closed
-   Corrosion or salt deposits around thermostat
-   Thermostat housing service requiring replacement thermostat and gasket

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   8M0109441 current OEM 160°F thermostat reference
-   8M0091470 earlier OEM thermostat reference
-   807252T2 earlier OEM thermostat reference
-   8072522 earlier formatted reference
-   8052732 earlier thermostat reference

### OEM / Related Numbers

-   8M0109441
-   8M0091470
-   807252T2
-   8072522
-   8052732
-   Mercury 160°F thermostat
-   MerCruiser 160 degree thermostat
-   23-8M0214947 related thermostat housing sleeve
-   23-806922 related thermostat sleeve
-   18-2917 related aftermarket gasket reference
-   Thermostat kit family references: 18-3644, 18-3647, 18-3648

### Aftermarket / Verified Equivalents

-   Sierra: 18-3649
-   GLM: 13100
-   Mallory / aftermarket 160°F MerCruiser thermostat equivalents where matched to 807252T2 / 8M0109441
-   Recmar / aftermarket 160°F thermostat equivalents for MerCruiser GM standard-cooling engines
-   Use 160°F only where the service chart calls for it; do not substitute 140°F thermostats unless specified by the cooling-system diagram

## 📦 Condition

-   Genuine Quicksilver part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 52.68 AUD
- **Vendor:** Quicksilver
- **Type:** Cooling System
- **Tags:** Quicksilver Marine Parts | Oils, Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 52.68 AUD | In stock |

## Images

- 8M0109441 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/8m0109441-mercury-mercruiser-thermostat-genuine-quicksilver-oem-part)
> Updated: 2026-09-18