20450739 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta o-ring used in the thermostat housing and coolant-outlet assembly. It is supplied as an individual service component under part number 20450739 and is intended to restore the original fit, alignment, sealing, support or operating function of the specified assembly. This listing supplies the named part only; adjoining components shown in an parts list for your engine are serviced separately unless explicitly stated.

🚤 Compatibility

Typically suits:

• Volvo Penta D5A-B TA
• Volvo Penta D5A-T
• Volvo Penta D5A-TA
• Volvo Penta D7A-B TA
• Volvo Penta D7A-T
• Volvo Penta D7A-TA
• Volvo Penta D7C-TA
• Volvo Penta TAD720VE
• Volvo Penta TAD721GE
• Volvo Penta TAD721VE
• Volvo Penta TAD722GE
• Volvo Penta TAD722VE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD520VE
• Volvo Penta MD2010
• Volvo Penta MD2010B

• Engine Family: D, TAD, MD

⚙️ Key Features

• 0.011 kg
• For the thermostat housing and coolant-outlet joint
• Listed for 17 applications across D, TAD and MD series engines
• The smaller 20450737 at 0.002 kg serves the same housing at a different seat

🔌 Function

Seals the thermostat housing and coolant-outlet joint, keeping pressurised coolant inside the circuit where the two faces meet.

⚠️ Common Signs of Failure

• Coolant weeping from the thermostat housing joint
• Repeated coolant top-ups with no visible hose leak
• Crusted deposits building up along the housing face
• Temperature climbing as the system loses pressure
• Ring found swollen, flattened or torn on strip-down

🛠️ Service Notes

• This is the heavier of the two housing rings at 0.011 kg; 20450737 covers the 0.002 kg seat
• Renew both rings together if the housing has been off for a thermostat change

📦 Condition

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