Volvo Penta Coolant Pump 21931911

Volvo Penta 21931911 is a genuine OEM engine coolant pump used in the closed-loop cooling system on applicable Volvo Penta diesel engines. The pump circulates coolant through the engine and cooling circuit to help maintain proper operating temperature. Volvo Penta 21931911 has been superseded by 23033741, which is the current replacement coolant pump.

Key Features

• Genuine Volvo Penta OEM coolant pump
• Original part number 21931911
• Current replacement part number 23033741
• Used as the primary coolant circulation pump
• Confirmed in the D8A1-A MP cooling-system assembly
• Works with the factory coolant-pump housing, pulley, gasket, O-rings and hose connections

Engine Compatibility

Confirmed catalog application includes:

• Volvo Penta D8A1-A MP

The D8A1-A MP cooling-system breakdown lists 21931911 and replacement 23033741 in the same coolant-pump position, along with remanufactured pump references 3801728 and 3801749.

Serial Number Fitment Notice

Confirm 21931911 / 23033741 against the engine serial number before ordering. Volvo Penta cooling-system components and pump revisions can vary by production range and engine configuration, so serial-number verification remains the safest way to confirm exact fitment.

When This Part Needs Replacement

Replace the coolant pump if there is confirmed coolant leakage, bearing or shaft play, abnormal pump noise, physical damage, or inadequate coolant circulation. Persistent overheating should be diagnosed carefully because thermostats, coolant restrictions, belt-drive problems, or other cooling-system components can produce similar symptoms.

Installation Notes

The applicable cooling-system assembly shows the pump working with:

• 21680904 Pulley
• 22329334 / 23002903 Coolant pump housing
• 979099 Gasket
• 1676622 Quick coupling
• 981250 Hose nipple
• 22909943 O-ring
• 990821 O-ring

Inspect the pulley, housing, seals and adjoining coolant connections while the pump is accessible. Clean all mating surfaces, follow the applicable Volvo Penta tightening specifications, refill with the correct coolant, and verify leak-free operation after installation.

Alternate/Superseded Part Numbers

• 21931911 Original Volvo Penta coolant pump
• 23033741 Current Volvo Penta replacement / superseding coolant pump
• 3801728 Remanufactured coolant-pump reference in the same application
• 3801749 Remanufactured coolant-pump reference in the same application

Parts Desk Insight

The key update on this pump is the supersession: 21931911 now crosses to 23033741. When replacing it, inspect the pump housing, pulley and seals at the same time so worn surrounding components do not create another cooling-system repair shortly afterward.