# 3839110 Thermostat | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta thermostat rated at 75°C, from the Cooling System group, weighing 0.234 kg and listed for 48 applications across TD, TWD, TID, TAMD and TAD series engines. It supersedes part number 1661993. The 75°C rating is what to match.

## 🚤 Compatibility

-   **Engine Family:** TD, TWD, TID, TAMD, TAD

Full model list at the end of this description.

## ⚙️ Key Features

-   Rated 75°C
-   Supersedes 1661993
-   0.234 kg
-   48 applications across five engine series
-   Quantity varies by assembly, most commonly one

## 🔌 Function

Holds the coolant in the engine until it reaches 75°C, then opens progressively to the cooler so the engine runs at a steady temperature instead of over- or under-cooling.

## ⚠️ Common Signs of Failure

-   Engine slow to warm up or never reaching temperature
-   Overheating with the cooler side of the circuit staying cold
-   Temperature gauge swinging up and down in normal running
-   Cabin or circuit heat output erratic
-   Thermostat found seized open or shut, or corroded around the flange

## 🛠️ Service Notes

-   Check the opening rating stamped on the old thermostat — this one is the 75°C unit and fitting the wrong rating will shift the running temperature
-   Renew the housing seal and refill and vent the system carefully after fitting
-   Confirm the fault is not a blocked cooler or a failed pump before condemning the thermostat

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3839110 → Supersedes 1661993

### OEM / Related Numbers

-   1661993 earlier number superseded by this part

### Aftermarket / Verified Equivalents

-   Recmar: REC3839110
-   Crom: 115418
-   SLP: T-993
-   Orbitrade: 15110

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta TAMD74P-A, TAMD74P-B, TAMD74A, TAMD74C-A, TAMD74C-B, TAMD74L-A, TAMD74L-B
-   Volvo Penta TAMD165A, TAMD165C, TAMD165P
-   Volvo Penta TAD730G, TAD730V
-   Volvo Penta TAMD163A-A, TAMD163P-A
-   Volvo Penta TD610G, TD610V
-   Volvo Penta TWD1210G, TWD1210V
-   Volvo Penta TWD1211V, TWD1211G
-   Volvo Penta TWD1630G, TWD1630V
-   Volvo Penta TWD610G, TWD610V
-   Volvo Penta TWD710G, TWD710V
-   Volvo Penta TWD740GE, TWD740VE
-   Volvo Penta TAD1030V
-   Volvo Penta TAD1230V
-   Volvo Penta TAD740GE
-   Volvo Penta TAD741GE
-   Volvo Penta TAMD162C-C
-   Volvo Penta TAMD75P-A
-   Volvo Penta TD121G-87
-   Volvo Penta TD1210G
-   Volvo Penta TD630VE
-   Volvo Penta TD71A
-   Volvo Penta TD710G
-   Volvo Penta TD730VE
-   Volvo Penta TID71A
-   Volvo Penta TWD1031VE
-   Volvo Penta TWD1230VE
-   Volvo Penta TWD1231VE
-   Volvo Penta TWD1240VE
-   Volvo Penta TWD1620G
-   Volvo Penta TWD630VE
-   Volvo Penta TWD731VE

## Details

- **Price:** 207.05 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 207.05 AUD | In stock |

## Images

- 3839110 Thermostat | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3839110-thermostat-genuine-volvo-penta)
> Updated: 2026-10-12