CPSF/103 | Nissan K21/K25 Water Pump 21010-FU425

Nissan K21/K25 Water Pump – 21010-FU425

Replacement engine water pump for compatible Nissan K21 and K25 forklift engines, used in industrial forklifts and material-handling equipment.

The water pump is an important component of the engine cooling system. It circulates coolant through the engine and associated cooling-system components, helping maintain the correct operating temperature and prevent engine overheating.

This aftermarket replacement is associated with Nissan OEM reference 21010-FU425, listed in Nissan engine parts documentation as a water pump assembly for compatible K21/K25 engine applications.

Product Specifications

• Sunbrite Part Number: CPSF/103

• Product Type: Engine Water Pump

• Engine Manufacturer: Nissan

• Engine Applications: K21 / K25 – verify exact fitment

• OEM Part Reference: 21010-FU425

• Application: Engine Cooling System

• Function: Engine Coolant Circulation

• Related Gasket Reference: 21014-07N00

• Related Pulley Reference: 21051-FU400

• Housing Material: Metal – exact alloy to be confirmed

• Impeller Material: Confirm with supplier

• Drive Type: Confirm against original pump

• Condition: New

• Manufacturer Type: Aftermarket

• Quantity Supplied: 1 Water Pump

• Gasket Included: Confirm before ordering

• Pulley Included: Confirm before ordering

Product Features

• Replacement water pump for compatible Nissan K21 and K25 forklift engines

• Designed to circulate coolant through the engine cooling system

• Helps support normal engine temperature regulation

• Suitable for correctly specified forklift engine repairs and maintenance

• Associated with Nissan part reference 21010-FU425

Engine Compatibility

Listed applications:

• Nissan K21

• Nissan K25

Compatibility depends on the exact engine configuration, original part number, water pump mounting arrangement and cooling-system components.

Important Ordering Information

Before purchasing, please confirm:

• Exact Nissan engine model and serial number

• Original water pump part number

• Mounting flange and bolt-hole arrangement

• Impeller configuration and dimensions

• Pulley mounting and drive arrangement

• Coolant inlet and outlet connections

• Whether a gasket or seal is included

• Whether the pulley or mounting hardware is included

Important: Similar-looking water pumps may have different impeller, mounting and pulley configurations. Always verify compatibility with the original component before ordering.

Installation should be performed by a qualified technician. After replacement, the cooling system should be filled, bled and inspected for leaks according to the relevant engine service instructions.

Contact Sunbrite Forklifts South Africa for assistance with Nissan K21/K25 water pumps, replacement cooling parts, compatibility, pricing and availability.