21146146 Return Line | Genuine Volvo Penta Part

🔧 Product Description

Brand-new genuine Volvo Penta lower/companion turbocharger oil-return line used in the TAD720VE inlet and exhaust system. It forms part of the two-piece drain arrangement beneath turbochargers 20460372/3802179 and 20571676/3802190, allowing hot oil to return to the crankcase by gravity.

🚤 Compatibility

Typically suits:

• Volvo Penta TD720VE PP
• Volvo Penta TAD720VE
• Volvo Penta TAD721VE
• Volvo Penta TAD722VE

• Engine Family: TD, TAD
• Serial Range: SN01099469-

⚙️ Key Features

• Lower/companion section of the two-piece turbo oil drain
• Factory-formed route and flange orientation
• Works with retainer 20405789, O-ring 20405822 and gasket 20405790
• Correct downward fall prevents oil pooling in the turbocharger
• Line only; seals, retainer and fasteners are separate
• Engine type: Volvo Penta 7-litre industrial diesel

🔌 Function

Drains lubricating oil from the turbocharger bearing housing back to the engine sump without restriction.

⚠️ Common Signs of Failure

• Oil leakage at the return-line joints
• Blue smoke from oil backing up in the turbocharger
• Coked or blocked drain passage
• Cracks caused by vibration
• Turbocharger seal leakage

🛠️ Service Notes

• Renew the sealing washers, O-rings or gaskets at each end rather than reusing them, and check the union faces are clean and unmarked
• Fit the line without pulling it into place; a return line that has to be strained to line up will crack or chafe through in service
• Keep the original routing, clips and protective sleeving so the line stays clear of hot and moving parts and cannot rub
• Do not kink a line, and do not straighten and re-bend a formed metal one — cap the open ends while the system is apart so no dirt gets in
• Tighten the unions to the figures given in the workshop manual for your engine, then run up and check both ends for weeps before closing the access

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21146146 → Supersedes 20450977

OEM / Related Numbers

• 20450977 earlier number superseded by this part
• Companion return line 21146075
• Turbocharger 20460372 / 3802179
• Turbocharger 20571676 / 3802190

Other-Brand OEM Numbers

• VOE21146146

📦 Condition

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