# 859787 Cap | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta cap for 859784, from the Cooling System group, weighing 0.095 kg and listed for 2 applications across the MD series. It is one of five parts in this run listed for 859784, alongside insert 859789, rim 859790, cover 859792 and sleeve 859794.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta MD22A
-   Volvo Penta MD22L

-   **Engine Family:** MD

## ⚙️ Key Features

-   For 859784
-   0.095 kg
-   2 applications across the MD series
-   One of five items in this run for 859784 — 859787, 859789, 859790, 859792 and 859794

## 🔌 Function

Closes and seals its opening on the assembly, so the circuit behind it stays sealed and holds its working pressure.

## ⚠️ Common Signs of Failure

-   Coolant weeping or a crusty trace around the cap
-   Sealing face or seal perished, hardened or split
-   Cap loose, or unable to hold pressure
-   Corrosion around the cap seat
-   Coolant level dropping with no obvious leak elsewhere

## 🛠️ Service Notes

-   Order against 859784 as well as the part number — the five items listed for it are not interchangeable with each other
-   Renew the sealing items whenever the assembly is opened

## 📦 Condition

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

## Details

- **Price:** 149.37 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 149.37 AUD | In stock |

## Images

- 859787 Cap | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/859787-cap-genuine-volvo-penta)
> Updated: 2026-10-10