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