Water Pump Assembly 8-97333361-0 8-97313904-0 For ISUZU NPR66 4HF1 Engine 8973333610 8973139040

The Water Pump Assembly (OEM Numbers: 8-97333361-0 / 8-97313904-0 / 8973333610 / 8973139040) is a premium-quality, direct replacement cooling system component designed specifically for ISUZU NPR66 series medium-duty trucks equipped with 4HF1 diesel engines. This complete water pump assembly ensures proper coolant circulation through the engine block, cylinder head, and radiator, maintaining optimal operating temperature for efficient combustion, reduced emissions, and extended engine life.

• OE Quality: Manufactured to strict ISUZU dimensional and material specifications for perfect fit and function
• High-Efficiency Impeller: Precision-cast, dynamically balanced impeller ensures optimal coolant flow at all engine speeds
• Durable Bearing Design: Sealed, heavy-duty ball bearings provide smooth, quiet operation and long service life
• Leak-Proof Mechanical Seal: Advanced ceramic/carbon face seal prevents coolant leakage and resists wear
• Corrosion-Resistant Housing: Cast housing with protective coating resists corrosion from coolant and engine environment
• Prevents Overheating: Maintains proper coolant circulation to prevent engine overheating and costly damage
• Restores Cooling Performance: Eliminates overheating, coolant loss, and bearing noise caused by worn pumps
• Direct Replacement: Simple bolt-on installation - no modification required
• Extended Engine Life: Proper cooling system function reduces thermal stress on engine components

This water pump assembly is specifically designed for ISUZU medium-duty trucks and commercial vehicles. Common applications include:

• ISUZU NPR66 (Medium-Duty Trucks)
• ISUZU N Series (NK, NP, VK - as applicable)
• ISUZU 4HF1 Engine Specifications:
  • 4-Cylinder, Inline Diesel
  • Displacement: 4.3L
  • Valvetrain: OHV
  • Application: Medium-duty trucks and commercial vehicles
• Also compatible with various ISUZU models using the 4HF1 engine with the same water pump configuration

1. Drain the cooling system - Drain coolant from the radiator and engine block
2. Remove the fan and belt - Remove the fan shroud (if equipped), fan assembly, and drive belt
3. Access the water pump - Remove any components blocking access to the water pump
4. Remove the old water pump - Unbolt and remove the old pump; clean the mounting surface thoroughly
5. Inspect the mounting surface - Check for corrosion, pitting, or warping on the engine block mounting surface
6. Clean and prepare surface - Remove all old gasket material and sealant residue; use appropriate cleaning tools
7. Install the new gasket - Position the new gasket on the mounting surface; ensure proper alignment
8. Install the new water pump - Mount the new pump onto the gasket; hand-tighten bolts
9. Torque bolts to specification - Tighten bolts in a criss-cross pattern to manufacturer torque specifications
10. Reinstall fan and belt - Reinstall the fan assembly and drive belt; adjust belt tension to spec
11. Reconnect hoses - Attach all coolant hoses and secure with hose clamps
12. Refill with coolant - Fill the system with the correct coolant mixture (50/50 antifreeze/water or as specified)
13. Bleed the cooling system - Start the engine and bleed air from the system per manufacturer procedure
14. Check for leaks - Inspect all connections and the pump seal area for coolant leakage
15. Check operating temperature - Allow engine to reach operating temperature and verify gauge reading

• Material Verification: Confirms housing and component materials meet ISUZU durability and corrosion resistance specifications
• Impeller Balance Testing: Dynamically balanced to ensure smooth operation and reduced bearing wear
• Leak Testing: Each pump pressure-tested to ensure seal integrity and leak-proof performance
• Bearing Performance Test: Bearing smoothness and preload verified to OE specifications
• Dimensional Inspection: Mounting holes, flange dimensions, and overall fit verified for exact replacement
• Surface Finish Inspection: All sealing surfaces and mating faces checked for proper finish and flatness
• Visual Inspection: 100% checked for casting defects, machining flaws, and seal damage
• Packaged Safely: Protected and boxed to prevent damage during transit

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea