# 23430700 Expansion Tank | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta expansion tank rated at 100 kPa for use with cap 23321023, weighing 39.92 kg and listed for ten applications across TWD and TWG series engines. The pressure rating must match the cap. It supersedes 22302318, and at nearly 40 kg the lift needs planning.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TWD1643GE
-   Volvo Penta TWD1652GE
-   Volvo Penta TWD1653GE
-   Volvo Penta TWG1663GE
-   Volvo Penta TWD1644-45GE
-   Volvo Penta TWD1663GE
-   Volvo Penta TWD1682-83GE
-   Volvo Penta TWD1683GE-B
-   Volvo Penta TWD1672-1673GE
-   Volvo Penta TWD1744GE

-   **Engine Family:** TWD, TWG

## ⚙️ Key Features

-   Rated at 100 kPa, for use with cap 23321023
-   39.916 kg
-   Supersedes 22302318
-   Listed for ten applications across TWD and TWG series engines
-   The tank pressure rating and the cap rating must match

## 🔌 Function

Holds the coolant reserve and gives the system somewhere to expand into as it heats, keeping the circuit full and pressurised so the coolant can run above its atmospheric boiling point.

## ⚠️ Common Signs of Failure

-   Coolant level dropping with no obvious leak elsewhere
-   Coolant loss from the cap or overflow when the engine is shut down hot
-   Steam or a sweet smell around the tank after a hard run
-   Staining, crusting or a weeping seam on the tank body
-   Corrosion pinholes or a split neck found once the tank is cleaned

## 🛠️ Service Notes

-   Fit the 100 kPa cap 23321023 - a cap of the wrong rating will either vent early or over-pressurise the circuit
-   Pressure test the cap as well as the tank before deciding which is at fault
-   At close to 40 kg this needs planned lifting and two people

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   23430700 → Supersedes 22302318

### OEM / Related Numbers

-   22302318 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 5640.03 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 5640.03 AUD | In stock |

## Images

- 23430700 Expansion Tank | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/23430700-expansion-tank-genuine-volvo-penta)
> Updated: 2026-10-10