# 23890704 Expansion Tank | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta expansion tank from the Cooling System group, weighing 3.09 kg and listed for 13 TAD series engine applications. It supersedes 22821822. A cracked tank shows as repeated top-ups.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD1643VE-B
-   Volvo Penta TAD1640-42GE-B
-   Volvo Penta TAD1640VE-B
-   Volvo Penta TAD1641VE-B
-   Volvo Penta TAD1642VE-B
-   Volvo Penta TAD1641VE
-   Volvo Penta TAD1642VE
-   Volvo Penta TAD1643VE
-   Volvo Penta TAD1650VE
-   Volvo Penta TAD1660-62VE
-   Volvo Penta TAD1662VE EU5
-   Volvo Penta TAD1670-72VE
-   Volvo Penta TAD1640-42VE-C

-   **Engine Family:** TAD

## ⚙️ Key Features

-   Cooling system expansion tank
-   3.09 kg
-   Supersedes 22821822
-   Listed for 13 TAD series engine applications

## 🔌 Function

Takes up the coolant that expands as the engine warms, keeps the circuit full and pressurised, and gives a place to check and top up the level.

## ⚠️ Common Signs of Failure

-   Coolant needing repeated topping up
-   Staining, crusted coolant or a wet film down the outside of the tank
-   Hairline cracks around the seams or the filler neck
-   Coolant blowing out on shutdown
-   Discoloured, oily or rusty coolant visible in the tank

## 🛠️ Service Notes

-   Renew the pressure cap with the tank - a weak cap will make a new tank look faulty
-   Pressure test the system before condemning the tank; a combustion leak into the coolant gives the same symptoms

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   23890704 → Supersedes 22821822 → Supersedes 17221971

### OEM / Related Numbers

-   22821822 earlier number superseded by this part
-   17221971 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 842.52 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 842.52 AUD | In stock |

## Images

- 23890704 Expansion Tank | Genuine Volvo Penta Part
- 23890704 Expansion Tank | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/23890704-expansion-tank-genuine-volvo-penta)
> Updated: 2026-10-12