875791 Thermostat Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta thermostat kit with a 55 degree C opening temperature, weighing 0.12 kg and listed for 20 applications across AQ, BB and MB series engines. The accessories catalogue prints it as the thermostat for the AQ165, AQ170, BB165 and BB170, alongside oil filter 3517857 and impeller kit 21951350 - the same filter and impeller kit listed for the AQ120B to BB145 group, which takes the 82 degree C thermostat 875580 instead. The rating is the identifying detail, and fitting a higher-rated unit will hold the engine hotter than intended.

🚤 Compatibility

Typically suits:

• Volvo Penta AQ130C
• Volvo Penta AQ120B
• Volvo Penta AQ125A
• Volvo Penta BB115A
• Volvo Penta BB115B
• Volvo Penta AQ170B
• Volvo Penta AQ170C
• Volvo Penta AQ115A
• Volvo Penta BB170B
• Volvo Penta BB170C
• Volvo Penta AQ130D
• Volvo Penta BB115C
• Volvo Penta AQ115B
• Volvo Penta BB140A
• Volvo Penta AQ165A
• Volvo Penta AQ170A
• Volvo Penta MB20A
• Volvo Penta BB165A
• Volvo Penta BB170A
• Volvo Penta AQ140A

• Engine Family: AQ, BB, MB

⚙️ Key Features

• 55 degree C opening temperature
• Listed for the AQ165, AQ170, BB165 and BB170
• The AQ120B to BB145 group takes thermostat 875580 at 82 degrees C
• 0.12 kg
• Listed with oil filter 3517857 and impeller kit 21951350
• Genuine Volvo Penta Part, designed and manufactured to ensure original fit, safety and performance
• Role: Thermostat
• Fits: AQ165, AQ170, BB165, BB170

🔌 Function

Holds the coolant in the engine until it reaches 55 degrees C, then opens to admit flow through the cooling circuit and hold the running temperature.

⚠️ Common Signs of Failure

• Engine slow to warm or never reaching normal running temperature
• Overheating shortly after start-up with the thermostat stuck shut
• Temperature reading hunting in normal running
• Thermostat that will not open when tested in hot water
• Corrosion, scale or a broken frame on the old unit

🛠️ Service Notes

• Read the temperature stamped on the old thermostat before ordering - this run holds 82, 75, 74, 60 and 55 degree C kits that look alike in the hand
• Renew the sealing gasket or ring with it and fit the thermostat the right way up
• Always refer to the operator's manual for the recommended maintenance and service intervals for your engine and drive

🔄 Supersession & Cross Reference

Aftermarket / Verified Equivalents

• Crom: 115211
• Orbitrade: ORB15791
• Sierra: 18-3663
• Recmar: REC875791

📦 Condition

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