1543654 Cap Nut | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta cap nut (part number 1543654) from the Engine system group, used as a threaded closing fastener on the 16-litre TAMD, TAD, TWD, TID and TD engine families. It secures and seals a stud or threaded fitting while covering the exposed thread end. Supplied as a single nut with a net weight of approximately 0.023 kg.

🚤 Compatibility

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

Full model list at the end of this description.

⚙️ Key Features

• OEM Volvo Penta part number 1543654
• System group: Engine
• Net weight approximately 0.023 kg (22.7 g)
• Fits TAMD162, TAMD163, TAMD165, TAD1630/1631, TWD1620/1630, TID162 and TD164 series engines
• Sold as an individual cap nut
• Engine type: Volvo Penta heavy-duty inline-six diesel engine
• 6 used per assembly

🔌 Function

A cap nut threads onto a stud or fitting to clamp the joint while its closed end covers and protects the exposed thread. It maintains fastener torque and helps keep dirt and moisture away from the thread.

⚠️ Common Signs of Failure

• Nut works loose, allowing the joint or fitting to leak or vibrate
• Rounded, damaged or seized threads preventing correct torque
• Corrosion or pitting of the nut body and sealing face
• Cracked or split closed end after over-tightening
• Repeated need to re-tighten the fastener in service

🛠️ Service Notes

• Check the thread length before fitting — a cap nut is closed at the end, so a stud that is too long, or grit in the blind end, will bottom the nut and give a false torque before the joint is properly clamped
• Tighten to the figure in the workshop manual for your engine; the closed head is not a reason to keep pulling on it
• Where the cap nut retains a pipe, cone or sealing washer, renew the sealing element and make sure the pipe enters square and unstressed before tightening
• Renew any cap nut that is corroded, has damaged threads or rounded flats, and refit whatever washer or locking arrangement belonged with it
• Marine-grade anti-seize on stainless threads reduces galling and makes later removal possible, but keep it off threads that must take a locking compound

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 1543657 - Valve-cover washer
• 943819 - Disc spring; two used at each cover
• 1543582 - Valve-cover damping ring
• 1543581 - Valve-cover gasket
• 1543469 - Valve cover

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TAMD162C-C, TAMD162A, TAMD162B, TAMD162C, TAMD162C-B
• Volvo Penta TID162AG, TID162AGP, TID162AP, TID162APB
• Volvo Penta TAD1630G, TAD1630GE, TAD1630P
• Volvo Penta TWD1630G, TWD1630P, TWD1630V
• Volvo Penta TAD1631GE, TAD1631G
• Volvo Penta TAMD163A-A, TAMD163P-A
• Volvo Penta TAMD165A, TAMD165C
• Volvo Penta TD164KAE
• Volvo Penta TWD1620G