# 855406 Cap | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta cooling system cap weighing 0.941 kg and listed for 14 applications on AQ series engines.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta AQ131A
-   Volvo Penta AQ131B
-   Volvo Penta AQ131C
-   Volvo Penta AQ131D
-   Volvo Penta AQ151A
-   Volvo Penta AQ151B
-   Volvo Penta AQ151C
-   Volvo Penta AQ171A
-   Volvo Penta AQ171C
-   Volvo Penta 230A
-   Volvo Penta 230B
-   Volvo Penta 250A
-   Volvo Penta 250B
-   Volvo Penta 251A

-   **Engine Family:** AQ

## ⚙️ Key Features

-   0.941 kg
-   For AQ series engines
-   14 listed applications
-   Cooling system cap

## 🔌 Function

Closes off its opening in the cooling system and holds the seal that keeps the system sealed in service.

## ⚠️ Common Signs of Failure

-   Coolant escaping or steaming from around the cap
-   Sealing face corroded, pitted or scaled
-   Cap difficult to fit or remove, or not seating squarely
-   Coolant loss with no leak anywhere else in the system

## 🛠️ Service Notes

-   A second cooling system cap, 855410, is listed for the same 14 applications at 0.088 kg, and they are not interchangeable - order by number against the position you are working on
-   Renew the gasket or sealing ring at the same time and check the sealing face for scale before refitting

## 📦 Condition

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

## Details

- **Price:** 360.6 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 360.60 AUD | In stock |

## Images

- 855406 Cap | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/855406-cap-genuine-volvo-penta)
> Updated: 2026-09-07