1543499 Flange Nut | Genuine Volvo Penta Part

🔧 Product Description

This is a genuine Volvo Penta flange nut from the fuel system group, used as a threaded fastener securing fuel system components and their brackets or lines. It is the current replacement for the earlier flange lock nut 471622 and carries an integral flange face that spreads clamping load across the mating surface. Supplied as a single nut with a net weight of approximately 0.011 kg.

🚤 Compatibility

• Engine Family: D, TAD, TWD, TID, TD, TAMD

Full model list at the end of this description.

⚙️ Key Features

• OEM Volvo Penta part number 1543499
• System group: Fuel System
• Supersedes and replaces earlier part number 471622
• Integral flange design distributes clamp load over the joint face
• Net weight approximately 0.011 kg (single nut)
• Fits D9, D11, D12 and D13 marine diesel engines plus TAD, TWD, TID, TD and TAMD industrial and genset series
• Engine type: Volvo Penta heavy-duty inline-six diesel engine
• Quantity varies by assembly, most commonly four

🔌 Function

The flange nut threads onto a stud or bolt to clamp fuel system components securely in place, with its wide flange face spreading load and helping resist loosening from vibration. It maintains the correct joint tension so fuel-carrying connections and mountings stay leak-free and secure.

⚠️ Common Signs of Failure

• Nut backing off or loosening under engine vibration, allowing component movement
• Rounded, damaged or seized threads preventing correct torque from being achieved
• Corrosion or thread galling making removal difficult or reducing clamping force
• Fuel weeping or seepage at a joint due to loss of clamp load
• Deformed or scored flange face that no longer seats evenly against the mating surface

🛠️ 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

• 1543499 → Supersedes 471622

OEM / Related Numbers

• 471622 earlier number superseded by this part
• 203962 - Related Volvo reference
• 470560 - Injector yoke stud
• 1543497 - Injector hold-down yoke
• 977298 - Turbocharger mounting stud
• 470467 - Turbocharger spacer sleeve

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D13C4-B MH, D13C1-B MH, D13C1-A MP, D13C2-A MP, D13C3-A MP, D13C4-A MP, D13B-A MP, D13B-H MP, D13B-G MP, D13B-L MP, D13B-E MG, D13B-E MG (FE), D13B-E MH, D13B-E MH (FE), D13B-F MG, D13B-F MG (FE), D13B-K MP, D13B-N MH, D13B-N MH (FE), D13B-B MP, D13B-D MP, D13B-J MP, D13B-M MP, D13B-C MP, D13C6-A MP, D13C1-A MH, D13C2-A MH, D13C5-A MP, D13C2-A MG, D13C1-A MG
• Volvo Penta D12C-A MP, D12D-A MG, D12D-A MH, D12D-A MP, D12D-B MH, D12D-B MP, D12D-C MH, D12D-C MP, D12D-D MP, D12D-E MG, D12D-E MH, D12D-E MP, D12D-F MP, D12D-G MH, D12D-G MP, D12D-H MP
• Volvo Penta D9A2J, D9A2G, D9A2L MH, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2M MP, D9A2A, D9A2C, D9A2E
• Volvo Penta D11C1-A MP, D11C3-A MP, D11C2-A MP, D11C4-A MP, D11B3-A MP, D11B4-A MP, D11B2-A MP, D11B1-A MP
• Volvo Penta TAMD162C-C, TAMD162A, TAMD162B, TAMD162C, TAMD162C-B
• Volvo Penta TID162AG, TID162AGP, TID162AP, TID162APB
• Volvo Penta TAD1241GE, TAD1241VE, TAD1241-42VE
• Volvo Penta TAD1630G, TAD1630GE, TAD1630P
• Volvo Penta TAD1640-42GE-B, TAD1640GE, TAD1640VE-B
• Volvo Penta TAD1641VE-B, TAD1641GE, TAD1641VE
• Volvo Penta TAD1642VE-B, TAD1642GE, TAD1642VE
• Volvo Penta TAD1650VE-B/51VE, TAD1650GE, TAD1650VE
• Volvo Penta TAD840GE, TAD840-43VE, TAD840GE-B
• Volvo Penta TAMD165A, TAMD165C, TAMD165P
• Volvo Penta TWD1630G, TWD1630P, TWD1630V
• Volvo Penta TAD1242GE, TAD1242VE
• Volvo Penta TAD1250VE, TAD1250-52VE
• Volvo Penta TAD1631GE, TAD1631G
• Volvo Penta TAD570-72VE, TAD570-71VE-B
• Volvo Penta TAMD163A-A, TAMD163P-A
• Volvo Penta TAD1140-42VE
• Volvo Penta TAD1150-52VE
• Volvo Penta TAD1170-72VE
• Volvo Penta TAD1180-83VE
• Volvo Penta TAD1240GE
• Volvo Penta TAD1251VE
• Volvo Penta TAD1252VE
• Volvo Penta TAD1341-43GE-B
• Volvo Penta TAD1344-45GE-B
• Volvo Penta TAD1346GE
• Volvo Penta TAD1351-53VE
• Volvo Penta TAD1371-75VE
• Volvo Penta TAD1643VE
• Volvo Penta TAD1651GE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TAD1670-72VE
• Volvo Penta TAD540-42VE
• Volvo Penta TAD550-51VE
• Volvo Penta TAD552VE
• Volvo Penta TAD580-83VE
• Volvo Penta TAD841-43GE
• Volvo Penta TAD850-52VE
• Volvo Penta TAD851-53GE
• Volvo Penta TAD853VE
• Volvo Penta TAD870-73VE
• Volvo Penta TAD950VE
• Volvo Penta TAD951VE
• Volvo Penta TAD952VE
• Volvo Penta TD164KAE
• Volvo Penta TWD1240VE
• Volvo Penta TWD1620G