478289 Gear | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta gear for engines from serial number 155516 onwards, weighing 1.213 kg and listed for 69 applications across the TAD, TD, TWD and TID series. Volvo Penta lists this part for engines from engine serial number 48351 onward.

🚤 Compatibility

• Engine Family: TAD, TD, TWD, TID
• Serial Range: SNXXXXXXXXXX/155516-

Full model list at the end of this description.

⚙️ Key Features

• For engines from serial number 155516 onwards
• 1.213 kg
• 69 applications across the TAD, TD, TWD and TID series
• Gear 478777, marked Nitro, is the close sibling at 1.196 kg
• Fitted from engine serial number 48351 onward

🔌 Function

Transmits drive through the timing train, keeping the driven shafts in phase with the crankshaft.

⚠️ Common Signs of Failure

• Whine, growl or rattle from the timing end of the engine
• Noise that changes with load rather than just speed
• Bright metal debris in the oil or filter
• Teeth found pitted, chipped or with a distinct wear step
• Backlash measured outside specification when checked at the gear

🛠️ Service Notes

• Gear 478777 is marked Nitro at 1.196 kg, and only 17 grams separate the two, so weight is no guide and the note plus the serial decide which one you need
• Check the mating gears and the idler bearing for matching wear and set the backlash on assembly

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TID121KG, TID121KGP, TID121KP, TID121KPB, TID121L, TID121LG, TID121LGP, TID121LP, TID121LPB, TID121K, TID121K-87
• Volvo Penta TD100G-85, TD100G, TD100GG, TD100GGP, TD100HP, TD100HPB, TD100GG-85, TD100GP, TD100GP-85
• Volvo Penta TID100KG, TID100KGP, TID100K, TID100K-87, TID100KGP-87, TID100KP, TID100KP-87, TID100KPB-87
• Volvo Penta TD121G-87, TD121GGP-87, TD121G, TD121GG, TD121GGP, TD121GP, TD121GPB
• Volvo Penta TD61A, TD61ACE, TD61AG, TD61AGP, TD61AP, TD61APB, TD61AW
• Volvo Penta TD71ACE, TD71AG, TD71AGP, TD71AP, TD71APB, TD71AW
• Volvo Penta TID71AG, TID71AGP, TID71AP, TID71APB
• Volvo Penta TAD1030P, TAD1030V
• Volvo Penta TID61AG, TID61AGP
• Volvo Penta TWD1210G, TWD1210P
• Volvo Penta TWD1211P, TWD1211G
• Volvo Penta TWD710P, TWD710PB
• Volvo Penta TAD730P
• Volvo Penta TD120HP
• Volvo Penta TD1210G
• Volvo Penta TD610M
• Volvo Penta TWD1030ME
• Volvo Penta TWD1031VE
• Volvo Penta TWD1230ME