978381 Reduction Nipple | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta reduction nipple weighing 0.113 kg and listed for 55 applications across TAD, TD, TWD and TID engines. It supersedes 6779497, which was catalogued earlier as a reducing nipple M26-M22 — worth knowing if you are working from an older parts list that quotes that description.

🚤 Compatibility

• Engine Family: TAD, TD, TWD, TID

Full model list at the end of this description.

⚙️ Key Features

• Reduction form — steps one thread size down to another
• Fits 55 applications across TAD, TD, TWD and TID engines
• 0.113 kg
• Supersedes 6779497, catalogued earlier as a reducing nipple M26-M22

🔌 Function

Steps a line down from a larger port thread to a smaller one, sealing at both sizes in a single fitting.

⚠️ Common Signs of Failure

• Weeping at either end of the reducer under pressure
• Either thread damaged, cross-started or stripped
• Hexagon flats rounded
• Corrosion or pitting on a sealing face
• Union will not seal however hard it is pulled up

🛠️ Service Notes

• Check both threads against the port and the line before fitting — a reducer that is right at one end and wrong at the other is still the wrong part
• Straight nipple 978281 covers a very similar engine list; confirm the position needs a reducer rather than a plain union

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 978381 → Supersedes 6779497

OEM / Related Numbers

• 6779497 earlier number superseded by this part

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TD61A, TD61ACE, TD61AG, TD61AGP, TD61AP, TD61APB, TD61AW
• Volvo Penta TD71A, TD71ACE, TD71AG, TD71AGP, TD71AP, TD71APB, TD71AW
• Volvo Penta TID71A, TID71AG, TID71AGP, TID71AP, TID71APB
• Volvo Penta TAD1030P, TAD1030V, TAD1030VE
• Volvo Penta TWD1210G, TWD1210P, TWD1210V
• Volvo Penta TWD1211V, TWD1211P, TWD1211G
• Volvo Penta TWD710P, TWD710PB, TWD710V
• Volvo Penta TAD730P, TAD730V
• Volvo Penta TD121G-87, TD121GP
• Volvo Penta TD730ME, TD730VE
• Volvo Penta TID61AG, TID61AGP
• Volvo Penta TWD1230ME, TWD1230VE
• Volvo Penta TAD1230V
• Volvo Penta TD100G
• Volvo Penta TD1030VE
• Volvo Penta TD1210G
• Volvo Penta TD164KAE
• Volvo Penta TD630VE
• Volvo Penta TD640VE
• Volvo Penta TWD1030ME
• Volvo Penta TWD1031VE
• Volvo Penta TWD1231VE
• Volvo Penta TWD630VE
• Volvo Penta TWD730ME
• Volvo Penta TWD731VE
• Volvo Penta TWD740VE