21569385 Flange Nut | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta 21569385 - Part Number: Drive-Gear Flange Nut A genuine high-strength flange nut used in a selected Volvo Penta marine-drive gear and flange assembly. It retains the gear or flange on its shaft and applies the specified clamping load without requiring a separate washer.

🚤 Compatibility

• Engine Family: TAD, D, TADH

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta high-strength flange nut
• Integrated flange distributes the clamping load
• Used in the specified marine-drive gear assembly
• Designed for high torque and rotating driveline loads
• Must be tightened and secured to the workshop specification
• Engine type: Volvo Penta IPS or sterndrive gear assembly

🔌 Function

Clamps the gear or flange securely to its shaft so drive torque is transferred without axial movement or loss of alignment.

⚠️ Common Signs of Failure

• Flange or gear movement
• Abnormal gear noise or vibration
• Fretting around the shaft or flange
• Damaged threads or loss of tightening torque
• Metal contamination after component movement

🛠️ Service Notes

• Check the flange seats flat on a clean, undamaged face; a flange nut is designed to spread its load without a separate washer, so do not add one unless the workshop manual for your engine shows it
• Clean the thread and inspect it for damage, corrosion and stretch before reuse of the stud or bolt, and renew the nut if it is a prevailing-torque or all-metal locking type that has already been run down once
• Tighten to the figure and sequence given in the manual for your engine, in stages where several nuts share a joint, so the component is pulled down evenly
• Use the correct size ring spanner or socket rather than an open-ended spanner — the flange leaves little room and a slipping spanner rounds the hexagon
• Recheck the joint after the first period of running, especially on exhaust, manifold and mounting joints that heat cycle

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21569385 → Supersedes 994112

OEM / Related Numbers

• 994112 earlier number superseded by this part
• 21623729 - flange
• 21735437 - gear
• 948888 - O-ring
• 914544 - snap ring
• 996056 - flange screw

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D8A2-A MP, D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG, D8A1-A MP, D8A3-A MP, D8A4-A MP
• Volvo Penta TAD570-72VE, TAD570-71VE-B
• Volvo Penta TAD840GE, TAD840-43VE
• Volvo Penta TAD880-82GE, TAD880-84VE
• Volvo Penta TADH880-82GE, TADH880-84VE
• Volvo Penta TAD540-42VE
• Volvo Penta TAD550-51VE
• Volvo Penta TAD552VE
• Volvo Penta TAD580-83VE
• Volvo Penta TAD850-52VE
• Volvo Penta TAD853VE
• Volvo Penta TAD870-73VE