20405649 Flywheel | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta SAE 3 flywheel with a listed rotational inertia of 1.2 kgm². It carries starter ring gear 21033328 and is retained to the crankshaft with ten screws 20405654.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• SAE 3 flywheel configuration
• Listed rotational inertia 1.2 kgm²
• Uses starter ring gear 21033328
• Retained with ten hexagon screws 20405654
• Requires run-out, ring-gear and mounting-face inspection before installation
• Engine type: Volvo Penta four- and six-cylinder industrial diesel

🔌 Function

Stores rotational energy, smooths crankshaft speed variation and transfers engine torque to the driven equipment.

⚠️ Common Signs of Failure

• Cracked flywheel or damaged mounting face
• Starter ring-gear tooth damage
• Excessive flywheel run-out
• Loose or fretted crankshaft mounting

🛠️ 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 / Related Numbers

• 21033328 - starter ring gear
• 20405654 - flywheel screws
• 20405643 - expansion plugs

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D5A-B TA, D5A-T, D5A-TA
• Volvo Penta D7A-B TA, D7A-T, D7A-TA
• Volvo Penta MD2010, MD2010B
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TAD520GE
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD720GE
• Volvo Penta TAD721GE
• Volvo Penta TAD722GE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TD520GE
• Volvo Penta TD720GE