21665014 Return Line | Genuine Volvo Penta Part

🔧 Product Description

A dedicated return line fitted in the open crankcase-ventilation system of Volvo Penta TAD560VE engines. It returns oil separated from the crankcase vapour stream to the engine.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD560VE
• Volvo Penta TAD561VE

• Engine Family: TAD

⚙️ Key Features

• TAD560VE open crankcase-ventilation application
• Oil- and heat-resistant return-line construction
• Correct factory routing from the oil separator
• Designed for the specified hollow screw, gaskets and clamps

🔌 Function

The line drains separated lubricating oil from the crankcase oil separator back into the engine while the cleaned vapour continues through the breather system.

⚠️ Common Signs of Failure

• Oil leakage around the return fittings
• Restricted or carboned return passage
• Excessive oil collecting in the separator
• Increased crankcase pressure
• Cracked, hardened or chafed line

🛠️ 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 / Related Numbers

• 20930510 - Oil separator
• 21665008 - Ventilation tube
• 993605 - Gasket
• 20460936 - Hollow screw
• 20799142 - Clamp
• 21088555 - Rubber sleeves
• 21088955 - Rubber sleeves
• 21500616 - Drain valve
• 993680 - Gasket
• 20999236 - Adapter
• 21458840 - Bracket

📦 Condition

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