3978074 Flywheel Housing | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta flywheel housing from the engine group, weighing 40.50 kg and listed for 6 applications across TWD, TID, TD and TAD series engines. It supersedes part number 420890, which was catalogued earlier as a flywheel housing with pin. At 40.50 kg it is a heavy casting needing mechanical lifting.

🚤 Compatibility

Typically suits:

• Volvo Penta TWD710V
• Volvo Penta TWD731VE
• Volvo Penta TID71A
• Volvo Penta TD730VE
• Volvo Penta TD71A
• Volvo Penta TAD730V

• Engine Family: TWD, TID, TD, TAD

⚙️ Key Features

• 40.50 kg casting
• 6 applications across TWD, TID, TD and TAD series engines
• Supersedes 420890, catalogued earlier as a flywheel housing with pin

🔌 Function

Encloses the flywheel and provides the machined face and register that the gearbox or transmission bolts to.

⚠️ Common Signs of Failure

• Oil leak tracking from the housing joint or the rear main area
• Cracks around a mounting boss or a bolt hole
• Register or spigot face worn so the gearbox sits out of true
• Bolt threads pulled in the casting
• Vibration or knocking from misalignment at the drive coupling

🛠️ Service Notes

• The earlier number was catalogued as the housing with a pin, so check whether the locating pin comes with the part or has to be ordered separately
• At 40.50 kg this needs mechanical lifting and will normally travel as a freight item
• Renew the rear main seal and gaskets while the housing is off and check alignment carefully on assembly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3978074 → Supersedes 420890 → Supersedes 420674 → Supersedes 420528

OEM / Related Numbers

• 420890 earlier number superseded by this part
• 420674 earlier number superseded by this part
• 420528 earlier number superseded by this part

📦 Condition

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