1677893 Hexagon Screw | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta hexagon screw is a high-load crank/flywheel fastener used in the crank mechanism/flywheel fastening position. It is manufactured to the original Volvo dimensional, material and interface requirements so the serviced assembly retains its designed alignment, sealing, load capacity and operating reliability. In service, it secures the designated crank-mechanism or flywheel component at the specified high-load joint. Selection must be confirmed by OEM part number 1677893, the exact engine/product model, serial number and the installed assembly configuration.

🚤 Compatibility

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

Full model list at the end of this description.

⚙️ Key Features

• OEM Volvo Penta part number 1677893
• Specified for use with flywheel 889617
• Net weight: 0.116 kg
• System group: Engine
• Fits D12 marine engines and TD, TWD, TAMD and TAD industrial engines
• 14 used per assembly

🔌 Function

The screw clamps the flywheel to the crankshaft flange and holds that clamping load against the high cyclic torque and vibration the flywheel transmits. Correct specification and torque are critical because a loose flywheel fastener can damage the crankshaft flange.

⚠️ Common Signs of Failure

• Loosening of the flywheel fasteners or detectable flywheel movement
• Stretched, necked or thread-damaged screws found on removal
• Rounded or damaged hexagon head preventing correct torquing
• Fretting or scoring on the flywheel or crankshaft mating faces
• Abnormal vibration or knocking from the flywheel housing

🛠️ Service Notes

• Check the length, thread and strength grade of the replacement against the screw you removed — engine fasteners are chosen for a specific clamp load, and a longer or softer screw is not a substitute
• Clean the threads in the component and make sure the mating faces are clean and flat before assembly; dirt, paint or old sealant in a joint feels like tightness and leaves the joint loose
• Tighten to the torque figure and the tightening sequence given in the workshop manual for your engine, working up progressively rather than pulling each screw down in one go
• Use thread locking or sealing compound only where the manual calls for it, and renew the locking washer, tab washer or nut that works with the screw
• Renew rather than reuse screws that are corroded, thread-damaged or visibly stretched, and any screw the manual tightens by torque-plus-angle

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• 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 TAD1241GE, TAD1241VE, TAD1241-42VE
• Volvo Penta TAD1630G, TAD1630GE, TAD1630P
• Volvo Penta TAMD165A, TAMD165C, TAMD165P
• Volvo Penta TAD1242GE, TAD1242VE
• Volvo Penta TAD1250VE, TAD1250-52VE
• Volvo Penta TAD1631GE, TAD1631G
• Volvo Penta TAMD163A-A, TAMD163P-A
• Volvo Penta TAD1240GE
• Volvo Penta TAD1251VE
• Volvo Penta TAD1252VE
• Volvo Penta TAMD162C-C
• Volvo Penta TD164KAE
• Volvo Penta TWD1240VE
• Volvo Penta TWD1620G
• Volvo Penta TWD1630G