21849939 Flywheel | Genuine Volvo Penta Part

🔧 Product Description

Heavy-duty engine flywheel for D9A2L MH installations. It stores rotational energy, provides the starter ring-gear mounting interface and connects engine torque to the driven equipment; ring gear 3838729 is a related separate component.

🚤 Compatibility

Typically suits:

• Volvo Penta D11C1-A MP
• Volvo Penta D11C3-A MP
• Volvo Penta D11C2-A MP
• Volvo Penta D11C4-A MP
• Volvo Penta D11B3-A MP
• Volvo Penta D11B4-A MP
• Volvo Penta D11B2-A MP
• Volvo Penta D11B1-A MP
• Volvo Penta D9A2L MH
• Volvo Penta D9A2M MP

• Engine Family: D

⚙️ Key Features

• D9A2L MH engine application
• Heavy-duty rotational mass
• Starter ring-gear interface
• Machined crankshaft mounting face
• Related ring gear 3838729
• Engine type: 9-litre 6-cylinder turbocharged marine-commercial diesel

🔌 Function

Smooths crankshaft speed between combustion events, carries the starter ring gear and transfers torque to the coupling or transmission.

⚠️ Common Signs of Failure

• Cracked or heat-spotted friction/coupling face
• Damaged starter-ring teeth
• Loose flywheel fasteners or fretting
• Incorrect run-out or balance after damage

🛠️ Service Notes

• Inspect the ring gear teeth for chipping, burring and one-sided wear before refitting — a damaged tooth ring will chew up a new starter pinion
• Check the clutch or damper mating face for scoring, heat cracking and blueing, and check the crankshaft rear seal and any spigot bearing while access is good
• Clean the crankshaft flange and the flywheel face so both are dry and free of oil, old sealant and burrs; a trace of oil on that joint is enough to let the flywheel work loose
• Locate the flywheel the correct way round on its dowel or locating feature, and renew the bolts wherever the manual calls them single-use
• Tighten the bolts progressively in a criss-cross pattern to the figure and stages given in the workshop manual for your engine, and never lever against the ring gear teeth to hold it

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21849939 → Supersedes 21169328 → Supersedes 3849381 → Supersedes 3838895

OEM / Related Numbers

• 21169328 earlier number superseded by this part
• 3849381 earlier number superseded by this part
• 3838895 earlier number superseded by this part
• 3838729 (related gear ring)

📦 Condition

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