# 859360 Heat Exchanger | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta heat exchanger for engines from serial number 2300032620 onwards, from the Cooling System group, weighing 3.291 kg and listed for 10 applications on the D series. It supersedes part number 840741. The serial breakpoint is the whole point of this row — engines before that number take a different exchanger. Brackets 859095 and 859363 in this run cover the same 10 D-series applications. It is a shell-and-tube exchanger, closed coolant on one side and raw water on the other.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta 2003
-   Volvo Penta 2003R
-   Volvo Penta D2003AG
-   Volvo Penta 2003D
-   Volvo Penta 2002AG
-   Volvo Penta 2002B
-   Volvo Penta 2002BG
-   Volvo Penta 2002D
-   Volvo Penta 2003B
-   Volvo Penta 2002

-   **Engine Family:** D
-   **Serial Range:** SN2300032620-

## ⚙️ Key Features

-   For engines from serial number 2300032620 onwards
-   Supersedes 840741
-   3.291 kg
-   10 applications on the D series
-   Shell-and-tube, closed coolant to raw water

## 🔌 Function

Transfers heat from the engine coolant to the raw water passing through it, so the engine runs at temperature without the coolant circuit being open to sea water.

## ⚠️ Common Signs of Failure

-   Engine running hot, especially under sustained load
-   Coolant loss with no external leak, or oil traces in the coolant
-   Raw water discharge reduced or intermittent at the exhaust outlet
-   Tube stack blocked with impeller debris, scale or weed on removal
-   Corrosion, weeping or pinholing at the end caps or the tube stack

## 🛠️ Service Notes

-   Check the engine serial number before ordering — this exchanger is listed from 2300032620 onwards
-   Renew the end cap seals and check the anode when the exchanger is off
-   Find where the impeller debris went before refitting, and inspect the raw water pump at the same time

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   859360 → Supersedes 840741

### Aftermarket / Verified Equivalents

-   MR COOL: MRC840741

## 📦 Condition

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

## Details

- **Price:** 3555.52 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3555.52 AUD | In stock |

## Images

- 859360 Heat Exchanger | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/859360-heat-exchanger-genuine-volvo-penta)
> Updated: 2026-10-10