21979938 Retainer | Genuine Volvo Penta Part

🔧 Product Description

Retaining component used in the Volvo Penta spin-on fuel-filter and filter-head arrangement. It secures the assigned filter or sealing component against vibration and fuel-system pressure pulses.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD840GE
• Volvo Penta TAD552VE
• Volvo Penta TAD853VE
• Volvo Penta TAD880-82GE
• Volvo Penta TAD880-84VE
• Volvo Penta TAD580-83VE
• Volvo Penta TAD570-72VE
• Volvo Penta TAD570-71VE-B
• Volvo Penta TAD550-51VE
• Volvo Penta TAD540-42VE
• Volvo Penta TAD840-43VE
• Volvo Penta TAD850-52VE
• Volvo Penta TAD870-73VE
• Volvo Penta TADH880-82GE
• Volvo Penta TADH880-84VE

• Engine Family: TAD, TADH

⚙️ Key Features

• Original retaining geometry and engagement depth
• Maintains component location under vibration
• Designed for the specified groove, bore or fastener
• Correct material hardness and spring characteristic
• Exact assembly position must be confirmed

🔌 Function

Locks or locates the assigned component so it cannot move axially, rotate or disengage during operation.

⚠️ Common Signs of Failure

• Loss of spring tension or grip
• Cracking or permanent distortion
• Wear at the retaining edge or groove
• Component movement or separation

🛠️ Service Notes

• Fit the retainer clean and dry unless the manual calls for lubricant, and make sure it is fully home in its groove or against its seat before the assembly is loaded
• Renew rather than reuse a retainer that has been removed — once a spring clip or ring has been spread it loses tension and can release in service
• Use the correct pliers or fitting tool; opening a retainer further than it needs to go, or prising it with a screwdriver, distorts it permanently
• Check the groove or landing face for wear, burrs and scoring, and dress or renew the mating part if the retainer will no longer seat squarely
• Where the retainer holds a rotating or spring-loaded part, confirm by hand that the assembly is captive and has the free movement the manual specifies before closing up

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21979938 → Supersedes 996832

OEM / Related Numbers

• 996832 earlier number superseded by this part
• 991048 - hollow screw
• 20852764 - sealing ring
• 21777574 - associated retainer
• 981857 - associated retainer
• 21751694 - associated retainer
• 20885496 - associated retainer
• 21961468 → 22562539 - related fuel-filter reference
• 22296404 - related fuel filter

📦 Condition

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