# 22720416 Thermostat Kit | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine Volvo Penta engine-coolant thermostat package for D8A marine diesel engines. The thermostat regulates coolant circulation through the engine and heat-exchanger circuit so the engine reaches and maintains its designed operating temperature.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D8A1-A MP
-   Volvo Penta D8A2-A MP
-   Volvo Penta D8A3-A MP
-   Volvo Penta D8A4-A MP

-   **Engine Family:** D
-   **HP Range:** Approximately 510-600 HP

## ⚙️ Key Features

-   Genuine Volvo Penta D8 thermostat kit
-   Correct Volvo Penta part number 22720416
-   Includes the calibrated thermostat and matching seal
-   Designed for D8A marine cooling systems
-   Full cooling-system diagnostics apply
-   Engine type: Volvo Penta D8A 7.7L inline six-cylinder common-rail diesel

## 📋 Kit Contents

-   1 × calibrated engine-coolant thermostat - serviced under 22720416
-   1 × thermostat sealing ring / gasket - serviced under 22720416
-   Individual internal thermostat components are not separately serviceable

## 🔌 Function

The thermostat remains closed during warm-up, then opens at its calibrated temperature to regulate coolant flow through the heat exchanger and maintain stable engine temperature.

## ⚠️ Common Signs of Failure

-   Engine overheats because the thermostat remains closed
-   Engine runs too cool because the thermostat remains open
-   Temperature fluctuates under load
-   Cabin-heater or coolant-circuit performance changes
-   Thermostat is corroded, stuck or damaged during cooling-system service

## 🛠️ Service Notes

-   Note how the old thermostat sits before removing it and fit the new one the same way round, with any small vent hole or jiggle pin uppermost so trapped air can escape
-   Clean the housing and its seat carefully, using nothing that leaves grit or scoring in the sealing face, and check that face is flat and free of corrosion
-   Use all the parts the kit provides, including the new seal or gasket, and discard the old ones
-   Tighten the housing fixings evenly to the figure in the manual for your engine — an alloy housing distorts or cracks easily
-   Refill and bleed the cooling system properly, then run the engine up and confirm it reaches and holds temperature while you watch the joint for weeps; never leave the thermostat out to mask an overheat, as engine flow depends on it

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   22720416 → Supersedes 23238134

### OEM / Related Numbers

-   23238134 earlier number superseded by this part

### Other-Brand OEM Numbers

-   VOE22720416

## 📦 Condition

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

## Details

- **Price:** 294.55 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 294.55 AUD | In stock |

## Images

- 22720416 Thermostat Kit | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/22720416-thermostat-kit-genuine-volvo-penta)
> Updated: 2026-08-22