21665788 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

A genuine elastomer O-ring used at the catalogued TAD761VE engine-system joint. Its material, diameter and cross-section are selected for the fluid, temperature and pressure at that position.

🚤 Compatibility

• HP Range: Approximately 250-300 HP
• Year Range: Approximately 2008 - 2015

⚙️ Key Features

• Genuine Volvo Penta sealing O-ring
• Factory diameter and cross-section
• Compatible with the assigned engine fluid
• Maintains pressure and contamination sealing
• Single-use service seal
• Engine type: 7.15L inline six-cylinder turbocharged industrial diesel

🔌 Function

Forms a compressed seal between the mating components to prevent fluid loss, air entry or pressure leakage.

⚠️ Common Signs of Failure

• Flattening or hardening
• Cuts or twisting during installation
• Swelling from incompatible fluid
• Recurring leakage from a damaged groove

🛠️ Service Notes

• Always fit a new O-ring — never refit one that has been removed, as it has already taken a set in its groove
• Clean the groove and both sealing faces and check them for nicks, scoring and corrosion pitting; a damaged groove will leak however good the new seal is
• Smear the ring with a little clean lubricant compatible with the fluid it seals, then roll it into place by hand so it sits untwisted and fully in its groove
• Never lever an O-ring over a sharp edge or thread with a screwdriver; use a blunt plastic tool and protect any edge the ring has to pass
• Assemble the joint squarely and tighten to the figure and sequence given in the workshop manual for your engine — over-tightening extrudes the ring and causes the very leak you were curing

📦 Condition

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