858639 Insert | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta cooling system insert weighing 2.948 kg and listed for 4 applications across AQAD, MD, TAMD and TMD series engines. It supersedes 838909. Two other inserts appear in this run - 858134 at 2.404 kg and 858833 at 9.752 kg - and all three carry published weights, so this one sits in the middle; they are separate parts rather than a graded range, so match the fitment.

🚤 Compatibility

Typically suits:

• Volvo Penta AQAD30A
• Volvo Penta MD30A
• Volvo Penta TAMD30A
• Volvo Penta TMD30A

• Engine Family: AQAD, MD, TAMD, TMD

⚙️ Key Features

• Supersedes 838909
• 2.948 kg
• 4 applications across four engine series
• Distinct from inserts 858134 and 858833

🔌 Function

Forms the removable internal element inside its cooling system housing, and is renewed on its own rather than replacing the whole assembly.

⚠️ Common Signs of Failure

• Coolant temperature climbing while the circuit stays full
• Coolant and oil or raw water mixing
• Scale, silt or debris packed into the passages
• Corrosion pinholes or split tubes found on strip-down
• Sealing ends distorted so the insert will not seat

🛠️ Service Notes

• Renew the end seals and gaskets whenever the insert is disturbed
• Flush the housing and check the anode before fitting a new insert

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 858639 → Supersedes 838909 → Supersedes 846056

OEM / Related Numbers

• 838909 earlier number superseded by this part
• 846056 earlier number superseded by this part

📦 Condition

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