20412357 Screw | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta screw used in the D5A-B TA flywheel assembly to retain flange 21091547 beside flywheel 20798469. The screw is a flywheel-system fastener rather than a general engine screw.

🚤 Compatibility

Typically suits:

• Volvo Penta D5A-B TA
• Volvo Penta D5A-T
• Volvo Penta D5A-TA
• Volvo Penta D7A-B TA
• Volvo Penta D7A-T
• Volvo Penta D7A-TA
• Volvo Penta D7C-B TA
• Volvo Penta MD2010
• Volvo Penta MD2010B

• Engine Family: D, MD

⚙️ Key Features

• Confirmed in the D5A-B TA flywheel assembly
• Used with flywheel flange 21091547
• Located beside starter gear ring 21033328
• Requires the specified high-strength fastening procedure
• Replace if threads or drive feature are damaged
• Engine type: Volvo Penta 5-litre industrial diesel
• 6 used per assembly

🔌 Function

Secures the flywheel flange component at the required clamp load.

⚠️ Common Signs of Failure

• Loose flywheel flange
• Rounded screw head
• Abnormal flywheel vibration
• Unable to achieve specified torque

🛠️ Service Notes

• Clean the threads in the casting and check them for damage before fitting; a screw run into a dirty or pulled thread gives a false torque reading and will not hold its load
• Tighten to the torque given in the workshop manual for your engine rather than by feel, and follow the specified sequence where the joint has one
• Use the thread locking or sealing compound the manual calls for at that joint — some screws pass into oil, coolant or fuel space and have to seal as well as clamp
• Renew any screw that is stretched, corroded in the shank, or has damaged threads or a rounded head, and never reuse one that was tightened by a stretch or angle-tighten procedure
• A little marine-grade anti-seize helps later removal where the manual permits it, but keep it off threads that are meant to take a locking compound

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20412357 → Supersedes 20441860 → Supersedes 20498595

OEM / Related Numbers

• 20441860 earlier number superseded by this part
• 20498595 earlier number superseded by this part
• 20798469 - flywheel for SAE 1 housing, 14-inch disc
• 21033328 - starter gear ring
• 21091547 - flywheel flange
• 20459926 - related flywheel hexagon screw

📦 Condition

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