Volvo Penta 82C Thermostat 20450736

Volvo Penta 82C Engine Cooling Thermostat 20450736

Volvo Penta 20450736 is a genuine OEM thermostat used in the closed-loop cooling circuits of D5A, D7A, D7C, and selected TAD and TD diesel engines. Installed in the thermostat housing and heat-exchanger circuit, it regulates coolant flow as the engine reaches operating temperature.

Part Details

• Part number: 20450736
• Brand: Volvo Penta
• Product type: Engine cooling thermostat
• Opening temperature: Approximately 8283C, or 180181F
• System: Closed-loop engine cooling and thermostat housing
• Quantity: One per confirmed assembly
• Related sealing ring: 20459961
• Earlier or related Volvo reference: 888848
• Condition: New genuine OEM part

Compatible Applications

• D5A-A TA, D5A-B TA, D5A-T, and D5A-TA
• D7A-B TA, D7A-T, and D7A-TA
• D7C-A TA, D7C-B TA, and D7C-TA
• TD420VE and TAD420VE
• TAD620VE, TAD650VE, and TAD660VE
• TAD750VE and TAD760VE

Cooling-system arrangements can vary by engine version, installation type, and production range. Confirm part number 20450736 against the engine model, serial number, and current thermostat-housing diagram before ordering.

When to Replace It

• The engine consistently runs hotter than normal
• The engine takes unusually long to reach operating temperature
• Engine temperature fluctuates during normal operation
• The thermostat is stuck open or closed
• Corrosion, deposits, or mechanical damage are visible
• Cooling-system service requires thermostat removal and inspection shows deterioration

A thermostat stuck closed can restrict coolant circulation and contribute to overheating. One stuck open can prevent the engine from reaching its intended operating temperature.

Installation Notes

Volvo Penta diagrams show 20450736 installed with sealing ring 20459961 inside the thermostat housing. Inspect the sealing ring and housing whenever the thermostat is removed.

• 888844: Thermostat housing
• 888845: Thermostat housing gasket
• 20459961: Thermostat sealing ring
• 888849 and 888817: Water outlet or discharge pipes
• 888818: Water inlet pipe

Use the applicable Volvo Penta workshop procedure for coolant draining, thermostat orientation, housing installation, refilling, and cooling-system bleeding.

Technical FAQ

Can I choose this thermostat by temperature rating alone?
No. Physically similar thermostats can have different fitment or calibration. Match part number 20450736 to the engine serial number and housing diagram.

Should the sealing ring be inspected during replacement?
Yes. Inspect related sealing ring 20459961 and the thermostat housing whenever the assembly is opened.

Is there a fixed replacement interval?
No manufacturer-supported interval is confirmed here. Inspect the thermostat during cooling-system service and replace it when testing, symptoms, or visible condition indicate failure.

What cross-references are associated with this thermostat?
References include Volvo number 888848, aftermarket number REC20450736, and SLP cross-reference T-736. Confirm the current OEM number before substitution.

Parts Desk Insights

Best use case: Restoring correct warm-up and coolant-flow control in a confirmed 20450736 thermostat-housing application.

Most common mistake: Ordering by the 82C rating alone. Confirm the engine model, serial number, and housing diagram because related engines can use different thermostat arrangements.

Sizing and fitment: Verify related sealing ring 20459961 while the housing is open to reduce the chance of reopening the cooling system for a small seal.