21951350 Impeller Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta twelve-blade raw water impeller kit weighing 0.12 kg and listed for 54 applications on the classic B21, B23 and B25-based AQ petrol engines and selected MD21 and AQD21 installations. The accessories catalogue prints it as the impeller kit for two engine groups: the AQ120B, AQ125, AQ131, AQ140, AQ145, AQ151, AQ171, 230, 250, 251, BB140 and BB145, and the AQ165, AQ170, BB165 and BB170. Both groups share oil filter 3517857, and the thermostat is what differs between them - 875580 for the first and 875791 for the second.

🚤 Compatibility

• Engine Family: AQ, BB, MD, B, MB, AQD
• Year Range: Approximately 1970s through the 1990s

Full model list at the end of this description.

⚙️ Key Features

• Twelve blades, approximately 57 mm diameter by 31.7 mm wide, with a 16 mm centre
• Listed for the AQ120B to BB145 group and for the AQ165, AQ170, BB165 and BB170
• Four-hole cover gasket included
• 0.12 kg
• Listed with oil filter 3517857, which is common to both groups
• Impeller kit
• Genuine Volvo Penta Part, designed and manufactured to ensure original fit, safety and performance
• Role: Impeller kit
• Fits: AQ120B, AQ125, AQ131, AQ140, AQ145, AQ151, AQ171, 230, 250, 251, BB140, BB145; AQ165, AQ170, BB165, BB170

📋 Kit Contents

• 1 x twelve-blade flexible impeller - Volvo Penta 831182, serviced by kit 21951350
• 1 x four-hole pump-cover gasket - Volvo Penta 855901

🔌 Function

The flexible impeller creates suction and pumps seawater through the engine cooling and wet exhaust system. Approximate dimensions are 57 x 31.7 mm, with twelve blades and a 16 mm centre.

⚠️ Common Signs of Failure

• Cooling water discharge weak or missing
• Impeller blades cracked, swollen or missing
• Overheating or a temperature alarm under load

🛠️ Service Notes

• The two engine groups this kit covers take different thermostats - 875580 for the AQ120B to BB145 group and 875791 for the AQ165 and AQ170 group
• A puller screw is listed for drawing the impeller out of the seawater pump without damaging the housing
• Never run the pump dry, and account for every vane before running the engine again
• Always refer to the operator's manual for the recommended maintenance and service intervals for your engine and drive
• Listed against more than one engine or drive family - check the qualifier that applies to your own engine or drive

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21951350 → Supersedes 875575 → Supersedes 831182

OEM / Related Numbers

• 875575 earlier number superseded by this part
• 831182 earlier number superseded by this part
• 855901 related reference

Other-Brand OEM Numbers

• SPX Johnson Pump: 09-801B

Aftermarket / Verified Equivalents

• Sierra: 18-3075
• GLM: 89530
• Jabsco: 2877-0001
• Jabsco: 4568-0001
• Mallory: 9-45701
• CEF: 500170CG
• Jabsco: 4568-0001-P

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 100S, 110S, 230A, 230B, 250A, 250B, 251A
• Volvo Penta B230, B230E, B230F, B230FB, B230FX
• Volvo Penta AQ130C, AQ130D, AQ130A, AQ130B
• Volvo Penta AQ131A, AQ131B, AQ131C, AQ131D
• Volvo Penta AQ151A, AQ151B, AQ151C
• Volvo Penta AQ170B, AQ170C, AQ170A
• Volvo Penta BB115A, BB115B, BB115C
• Volvo Penta BB170B, BB170C, BB170A
• Volvo Penta MB20A, MB20B, MB20C
• Volvo Penta AQ115A, AQ115B
• Volvo Penta AQ125B, AQ125A
• Volvo Penta AQ145B, AQ145A
• Volvo Penta AQ171A, AQ171C
• Volvo Penta AQD21A, AQD21B
• Volvo Penta MD21B, MD21A
• Volvo Penta AQ120B
• Volvo Penta AQ140A
• Volvo Penta AQ165A
• Volvo Penta B20
• Volvo Penta BB140A
• Volvo Penta BB145A
• Volvo Penta BB165A