UD TRUCKS NISSAN DIESEL BIG THUMB CW520 CW540 CD520 CK520 RF8 RG8 RH8 17.0L 17.9L 21.2L V8 DIESEL V-BELT PULLEY ENGINE COOLING WATER PUMP ASSY (OE: 21010-97402 / 2101097402 / 21010-97228 / 21010-97325 / 21010-97403 / A-2150 / A2150)

Overview

The UD Trucks / Nissan Diesel Big Thumb CW520 RF8 / RG8 / RH8 V8 Engine Water Pump Assembly (Water Pump Assy 21010-97402 / 2101097402 / 21010-97325 / 21010-97228 / A-2150) is a commercial-grade engine cooling system component engineered specifically for UD Trucks and Nissan Diesel heavy commercial transport trucks, prime movers, and multi-axle tippers powered by Nissan Diesel RF8 (17.0L), RG8 (17.9L), and RH8 (21.2L) naturally aspirated and turbocharged V8 direct-injection diesel engines (UD Big Thumb CW520, CW540, CD520, CK520, CWB520, and C-Series heavy prime movers, logging trucks, cargo lorries, dump trucks, and concrete mixers). Built with an integrated V-belt / multi-groove belt pulley assembly, reinforced cast iron volute casing, precision-machined multi-bolt perimeter mounting base, and a high-flow internal cast iron impeller, this water pump delivers continuous, pressurized coolant circulation through both cylinder banks, cylinder heads, and engine oil coolers of the large-displacement V8 power plant. Replacing a worn, noisy, bearing-seized, or leaking water pump restores optimal cooling efficiency, preventing engine overheating, cylinder liner cavitation, and blown head gaskets under sustained heavy commercial payloads.

Key Dimensions & Specifications

• Drive & Pulley Configuration: Factory-fitted V-belt / multi-groove drive pulley engineered for precise belt tracking and balanced rotation under high engine RPM and torsional load.

• Housing & Port Structure: Heavy-duty cast iron volute casing featuring internal flow runners and external structural reinforcement ribs designed to absorb extreme engine vibration and high thermal stress.

• Mounting Base Configuration: Multi-bolt perimeter mounting flange base with a flat CNC-machined rear sealing surface for direct installation onto the engine timing case / front block cavity.

• Bearing & Mechanical Shaft Seal: Industrial-grade sealed roller/ball bearing cartridge paired with a wear-resistant silicon-carbide/carbon mechanical shaft seal to withstand high belt tension and prevent coolant weepage.

• Coolant Flow Impeller: Dynamically balanced high-capacity cast internal impeller designed for continuous, high-volume coolant displacement across both cylinder banks of the 17.0L–21.2L V8 block.

• Please verify your existing water pump pulley belt profile (V-belt / groove type), mounting hole pattern, and coolant port orientation against your old sample pump before ordering.

Compatible Truck Models & Engine Applications

• UD TRUCKS / NISSAN DIESEL COMMERCIAL TRUCKS & PRIME MOVERS:

  • Big Thumb Heavy Truck Series (CW520, CW540, CD520, CK520, CV520, CWB520, CG520 Heavy Prime Movers, Heavy Cargo Lorries, Multi-Axle Tippers, Dump Trucks & Concrete Mixers)

  • Resona & C-Series Heavy Commercial Vehicles running RF8 / RG8 / RH8 engines

• Engine Application:

  • Nissan Diesel / UD RF8 (17.0L / 16,991cc V8 Naturally Aspirated Direct Injection Diesel)

  • Nissan Diesel / UD RG8 (17.9L / 17,990cc V8 Naturally Aspirated Direct Injection Diesel)

  • Nissan Diesel / UD RH8 (21.2L / 21,166cc V8 Naturally Aspirated Direct Injection Diesel)

• OEM & Cross-Reference Part Numbers:

  • 21010-97402 / 2101097402 (Nissan Diesel / UD Genuine OEM)

  • 21010-97228 / 2101097228

  • 21010-97325 / 2101097325

  • 21010-97403 / 2101097403

  • PARAUT / ASAHI: A-2150 / A2150

• (Note: Nissan Diesel Big Thumb V8 engines utilize different water pump designs depending on the chassis series and drive belt setup [such as CW53 RE8/RD8 pumps 21010-97110A vs. CW520 RF8/RG8/RH8 pumps 21010-97402]. This 21010-97402 / A-2150 unit is specifically configured for CW520 series trucks running RF8, RG8, and RH8 V8 engines with the V-belt pulley drive. Always check your chassis code [CW520] and compare the pulley profile against your old sample pump prior to ordering.)

Why Choose Our Commercial Truck Parts?

• High-Volume Dual-Bank Coolant Flow: Precision-cast impeller delivers steady, pressurized circulation across both cylinder banks and dual oil coolers, eliminating localized hot spots under sustained heavy haulage.

• Integrated Balanced Belt Pulley: Factory-assembled pulley ensures concentric alignment with the engine belt drive, reducing belt slip, vibration, and premature belt wear.

• High-Capacity Bearing & Mechanical Seal: Sealed heavy-duty bearing cartridge paired with a premium silicon-carbide mechanical seal withstands continuous belt tension and high cooling system pressures without developing shaft play or weeping.

• Rigid Cast Iron Volute Body: Thick-walled iron casting resists thermal fatigue, engine vibration, and cracking during heavy commercial operation.

• Precision CNC-Machined Mounting Flange: Flat-machined sealing surface ensures direct bolt-on installation with dependable, leak-free gasket sealing against the engine block.

• Ready Stock & Fast Shipping: Readily stocked for quick dispatch.

Need Help Confirming Fitment?

Unsure whether this 21010-97402 water pump matches your UD CW520 truck's existing V8 engine setup?

• Check your old pump against the V-belt pulley grooves, mounting base pattern, and port layout.

• Or send your Chassis Number (VIN) / Engine Model (RF8 / RG8 / RH8) / sample photos to our team via WhatsApp for instant confirmation!