20711957 Ring Gear | Genuine Volvo Penta Part

🔧 Product Description

A genuine flywheel starter ring gear for Volvo Penta D12 engines. The gear has 153 teeth and fits the documented approximately 450 mm inside-diameter and 492 mm outside-diameter flywheel register.

🚤 Compatibility

• Engine Family: D, TAD, TWD, TID, TD, TAMD
• HP Range: 230 HP

Full model list at the end of this description.

⚙️ Key Features

• 153 precision-machined starter-ring teeth
• Approximately 450 mm inside diameter and 492 mm outside diameter
• Approximately 17 mm width
• Heat-treated tooth profile for repeated starter-pinion engagement
• Interference fit is matched to the specified D12 flywheel
• Ring must be installed squarely and with the specified tooth orientation
• Dimensions: Approx. 450 mm ID x 492 mm OD x 17 mm width

🔌 Function

Provides the toothed engagement surface used by the starter pinion to crank the engine.

⚠️ Common Signs of Failure

• Starter teeth are chipped, rounded or missing
• The starter spins or grinds without reliable engagement
• The ring gear is loose on the flywheel
• Heat damage or cracking is visible
• Repeated starter-pinion damage indicates incorrect ring-gear condition or alignment

🛠️ Service Notes

• This is the largest ring gear in the range at 153 teeth and approximately 492 mm outside diameter, sized for the D12/D13/D16 flywheel rather than the smaller-diameter rings used elsewhere in the catalogue — confirm the ID/OD and tooth count against the flywheel removed before ordering
• Fitment spans both marine (MH/MP/MG) and industrial TAD/TWD variants across the D12-D16 range, so match the exact engine designation rather than assuming a marine unit and an industrial generator unit share identical flywheel hardware

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20711957 → Supersedes 8193939 → Supersedes 471532

OEM / Related Numbers

• 8193939 earlier number superseded by this part
• 471532 earlier number superseded by this part
• ZG.30443-0008 - Related cross-reference
• 3841339 - Related flywheel references
• 866380 - Related flywheel references
• 970893 - Related flywheel screw

Aftermarket / Verified Equivalents

• DT Spare Parts: 2.10073
• C.E.I.: 123.209
• FEBI Bilstein: 45783
• BF: 200904D1201
• Auger: 58450
• PE Automotive: 140.233-00A
• Sampa: 033.200
• ATP: RG-39

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D13C3-B MH, D13C1-B MH, D13C4-B MH, D13C1-A MP, D13C2-A MP, D13C3-A MP, D13C4-A MP, D13B-A MP, D13B-H MP, D13B-G MP, D13B-L MP, D13B-E MG, D13B-E MG (FE), D13B-E MH, D13B-E MH (FE), D13B-F MG, D13B-F MG (FE), D13B-K MP, D13B-N MH, D13B-N MH (FE), D13B-B MP, D13B-D MP, D13B-J MP, D13B-M MP, D13B-C MP, D13C4-B MP, D13C5-B MP, D13C6-A MP, D13C1-A MH, D13C2-A MH, D13C3-B MG, D13C4-B MG, D13C5-A MP, D13C2-A MG, D13C1-A MG, D13C7-B MP, D13C8-B MP
• 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 D16C-A MG, D16C-A MH, D16C-B MH, D16C-C MH, D16C1-E MG, D16C1-F MG, D16C2-E MG, D16C2-F MG, D16C-D MH, D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
• Volvo Penta TAMD162C-C, TAMD162A, TAMD162B, TAMD162C, TAMD162C-B
• Volvo Penta TAD1640-42GE-B, TAD1640GE, TAD1640VE-B, TAD1640-42VE-C
• Volvo Penta D9A2L MH, D9A2M MP, D9A2A
• Volvo Penta TAD1241GE, TAD1241VE, TAD1241-42VE
• Volvo Penta TAD1341-43GE-B, TAD1341VE, TAD1341GE
• Volvo Penta TAD1344-45GE-B, TAD1344VE, TAD1344GE
• Volvo Penta TAD1630G, TAD1630GE, TAD1630P
• Volvo Penta TAD1641VE-B, TAD1641GE, TAD1641VE
• Volvo Penta TAD1642VE-B, TAD1642GE, TAD1642VE
• Volvo Penta TAD1650VE-B/51VE, TAD1650GE, TAD1650VE
• Volvo Penta TAMD165A, TAMD165C, TAMD165P
• Volvo Penta D8A6-A MH, D8A6-A MG
• Volvo Penta TAD1242GE, TAD1242VE
• Volvo Penta TAD1250VE, TAD1250-52VE
• Volvo Penta TAD1342VE, TAD1342GE
• Volvo Penta TAD1343VE, TAD1343GE
• Volvo Penta TAD1345GE, TAD1345VE
• Volvo Penta TAD1350GE, TAD1350VE
• Volvo Penta TAD1351GE, TAD1351-53VE
• Volvo Penta TAD1631GE, TAD1631G
• Volvo Penta TAD1643VE-B, TAD1643VE
• Volvo Penta TAD940GE, TAD940VE
• Volvo Penta TAD941VE, TAD941GE
• Volvo Penta TAMD163A-A, TAMD163P-A
• Volvo Penta TWD1630G, TWD1630V
• Volvo Penta TWD1683GE-B, TWD1683VE
• Volvo Penta TWD740GE, TWD740VE
• Volvo Penta D4-230I-G
• Volvo Penta TAD1140-42VE
• Volvo Penta TAD1150-52VE
• Volvo Penta TAD1170-72VE
• Volvo Penta TAD1180-83VE
• Volvo Penta TAD1240GE
• Volvo Penta TAD1251VE
• Volvo Penta TAD1252VE
• Volvo Penta TAD1340VE
• Volvo Penta TAD1352GE
• Volvo Penta TAD1353GE
• Volvo Penta TAD1354GE
• Volvo Penta TAD1355GE
• Volvo Penta TAD1360-62VE
• Volvo Penta TAD1363-65VE
• Volvo Penta TAD1371-75VE
• Volvo Penta TAD1380-82GE
• Volvo Penta TAD1381-85VE
• Volvo Penta TAD1384-85VE-IWP
• Volvo Penta TAD1651GE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TAD1670-72VE
• Volvo Penta TAD730V
• Volvo Penta TAD740GE
• Volvo Penta TAD741GE
• Volvo Penta TAD942VE
• Volvo Penta TAD943VE
• Volvo Penta TAD950VE
• Volvo Penta TAD951VE
• Volvo Penta TAD952VE
• Volvo Penta TD164KAE
• Volvo Penta TD71A
• Volvo Penta TD730VE
• Volvo Penta TID71A
• Volvo Penta TWD1240VE
• Volvo Penta TWD1620G
• Volvo Penta TWD1643GE
• Volvo Penta TWD1644-45GE
• Volvo Penta TWD1652GE
• Volvo Penta TWD1653GE
• Volvo Penta TWD1663GE
• Volvo Penta TWD1672-1673GE
• Volvo Penta TWD1682-83GE
• Volvo Penta TWD1744GE
• Volvo Penta TWD710V
• Volvo Penta TWD731VE