1556083 Shoulder Screw | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta shoulder screw is a structural fastening, locking or support component used in the oil sump and lubrication-system fastening. It is manufactured to the original Volvo Penta dimensions and interface requirements so the assembly retains its designed clamp load, support and alignment. In service, it locates and fastens the matched oil-sump/lubrication component with the specified shoulder length. Fitment is controlled by the exact engine or product configuration and serialised parts list; confirm OEM number 1556083 against the installed assembly before ordering.

🚤 Compatibility

• Engine Family: TAMD, TWD, TD

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta OEM part number 1556083
• Shoulder screw design combining a threaded section with an unthreaded locating shoulder
• Net weight 0.034 kg
• Supersedes earlier part number 847799
• Fits TD, TAMD and TWD series marine and industrial diesel engines
• Quantity varies by assembly, most commonly 34

🔌 Function

A shoulder screw fastens and simultaneously locates a component, with the unthreaded shoulder setting the seating position while the threads provide clamping force. Correct torque and an undamaged shoulder are essential to keep the mated parts aligned in service.

⚠️ Common Signs of Failure

• Stripped, galled or cross-threaded threads that prevent correct torque
• Corrosion or seizing making removal difficult or causing breakage
• Repeated loosening under vibration, indicating a worn or stretched screw
• Wear or scoring on the locating shoulder allowing the attached component to shift
• Damaged or rounded head from previous removal attempts

🛠️ Service Notes

• A shoulder screw locates as well as clamps, so check the shoulder diameter and length against the one removed and never substitute a plain screw of the same thread
• Inspect the shoulder and the bore or bush it locates in for wear, scoring and ovality; a worn shoulder lets the part it positions move
• Make sure the shoulder bottoms properly in its bore or against its face, and check that the part it locates still sits or moves as intended
• Tighten to the figure in the workshop manual for your engine — the clamp is taken on the shoulder, so extra torque only stretches or shears the screw
• Renew any locking washer, tab or nut that came with it, and use thread lock or sealant only where the manual calls for it

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 1556083 → Supersedes 847799

OEM / Related Numbers

• 847799 earlier number superseded by this part

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TAMD74P-A, TAMD74P-B, TAMD74C-A, TAMD74C-B, TAMD74L-A, TAMD74L-B
• Volvo Penta TAMD63L-A, TAMD63P-A
• Volvo Penta TD630ME, TD630VE
• Volvo Penta TWD610PB, TWD610V
• Volvo Penta TWD630ME, TWD630VE
• Volvo Penta TAMD75P-A
• Volvo Penta TD164KAE
• Volvo Penta TD610V
• Volvo Penta TD640VE
• Volvo Penta TWD730ME
• Volvo Penta TWD731VE
• Volvo Penta TWD740VE