11128689 Flywheel Housing | Genuine Volvo Penta Part

🔧 Product Description

This is a genuine Volvo Penta flywheel housing from the Engine group, forming the structural bell housing between the rear of the engine block and the transmission, marine gear or generator drive end. It encloses and protects the flywheel and ring gear while providing the machined mounting face and alignment for the starter motor and driven equipment. This casting supersedes the earlier flywheel housing and serves D12D marine engines along with TWD, TAD industrial and generator-set variants.

🚤 Compatibility

Typically suits:

• Volvo Penta D12D-A MG
• Volvo Penta D12D-A MH
• Volvo Penta D12D-B MH
• Volvo Penta D12D-C MH
• Volvo Penta D12D-E MG
• Volvo Penta D12D-E MH
• Volvo Penta D12D-G MH
• Volvo Penta TWD1240VE
• Volvo Penta TAD1241GE
• Volvo Penta TAD1242GE
• Volvo Penta TAD1250VE
• Volvo Penta TAD1251VE
• Volvo Penta TAD1252VE
• Volvo Penta TAD1250-52VE
• Volvo Penta TAD1240GE
• Volvo Penta TAD1241VE
• Volvo Penta TAD1242VE
• Volvo Penta TAD1241-42VE

• Engine Family: D, TWD, TAD
• HP Range: Approximately 400-500 HP
• Year Range: Approximately late 1990s - 2000s

⚙️ Key Features

• OEM Volvo Penta part number 11128689
• System group: Engine
• Net weight 91 kg
• Supersedes and replaces part number 11030277
• Fits D12D marine engines and TWD1240VE, TAD1240GE, TAD1241/1242 and TAD1250/1251/1252 series engines
• Engine type: Volvo Penta inline 6-cylinder 12-litre generator diesel

🔌 Function

The flywheel housing bolts to the rear face of the engine block to enclose the flywheel and ring gear and to carry the starter motor in correct mesh with the ring gear. It also provides the rigid, precisely aligned mounting interface for the marine gear, generator or driven unit at the rear of the engine.

⚠️ Common Signs of Failure

• Cracking of the casting around the mounting flange or starter motor boss
• Oil leakage at the rear main seal area or housing-to-block joint
• Elongated, stripped or damaged bolt holes causing loose fastening
• Excessive noise or vibration from misalignment between the engine and driven unit
• Starter motor engagement problems caused by a worn or distorted starter mounting face

🛠️ Service Notes

• Clean both faces back to bare metal and remove every trace of old gasket and sealant before offering the housing up; trapped debris on this joint causes both leaks and misalignment
• Locate the housing on its dowels and pull it down evenly, working outwards from the centre, in the sequence and to the figures in the workshop manual for your engine
• Seal the joints where the housing meets the block and the sump exactly as the manual specifies — those corners are a common source of oil weeps
• Renew the crankshaft rear seal while the access is open rather than refitting an old one, and check its running surface at the same time
• Confirm the housing bore and face run true to the crankshaft before hanging a gearbox or drive on it; a housing out of alignment will destroy couplings and bearings

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 11128689 → Supersedes 11030277

OEM / Related Numbers

• 11030277 earlier number superseded by this part
• 85108352 - Related rear crankshaft seal
• 1543896 - Related rear crankshaft seal
• 11127387 - Related threaded plug
• 11127388 - Related lock washer
• 467367 - Related housing plugs
• 11031785 - Related housing plugs
• 849135 - Related cover
• 421158 - Related sealing ring
• 949656 - Related O-ring

📦 Condition

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