The Cooling Fan (OEM: 5136620121 / 5-13662012-1) is a direct-fit, OE-quality fan blade assembly designed for Isuzu NPR trucks equipped with the 4HE1 diesel engine, as well as various industrial applications. This engine cooling fan draws air through the radiator to dissipate heat from the coolant, preventing engine overheating and maintaining optimal operating temperature.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and reliable cooling
• Precision Balanced: Dynamically balanced to minimize vibration and noise, extending fan clutch and bearing life
• Heavy-Duty Material: Reinforced plastic or stamped steel resists cracking, warping, and fatigue under high temperatures
• Optimized Blade Design: Engineered for maximum airflow with minimal power draw
• Direct Replacement: Matches factory bolt pattern, pilot diameter, and rotation direction - simple bolt-on installation
• Restores Cooling Performance: Eliminates vibration, noise, and overheating caused by damaged fans
• Cost-Effective: Affordable alternative to genuine OEM fans without compromising quality

This cooling fan is specifically designed for Isuzu NPR trucks with 4HE1 engine, and also fits various industrial applications.

• ISUZU NPR (medium-duty truck, 4HE1 engine, model years 1995-2005 typical)
• ISUZU NKR (select models with 4HE1 - verify)

• 4HE1 engines used in generators, compressors, forklifts, and other stationary equipment

• 4-Cylinder, Inline Diesel
• Displacement: 4.8L (4770cc) or 5.2L (depending on variant)
• Application: NPR, NKR, industrial power units

Installation steps (typical for engine cooling fan):

1. Disconnect battery negative cable
2. Remove the fan shroud (if equipped) for access
3. If the fan is mounted to a fan clutch, use a holding tool to prevent rotation
4. Remove the mounting bolts (usually 4 or 6) securing the fan to the clutch or water pump hub
5. Remove the old fan. Inspect the fan clutch for leaks or play - replace if necessary
6. Compare new fan with old - verify diameter, bolt pattern, and orientation (some fans have a "front" marking)
7. Install the new fan onto the clutch/hub, ensuring the bolt holes align
8. Hand-start all bolts, then torque to specification (typically 10-15 Nm for M8 bolts, 20-25 Nm for M10). Use a star pattern
9. Reinstall the fan shroud
10. Reconnect battery, start engine, and check for vibration or unusual noise

• Material Verification: Plastic/steel composition and tensile strength tested
• Dimensional Inspection: Overall diameter, blade pitch, mounting hole pattern, and pilot bore verified against OE blueprints
• Dynamic Balance Test: Each fan spun at operating speed to ensure imbalance ≤ 5g*cm
• Heat Aging Test: Samples exposed to 100°C for 500 hours to check for warping or cracking
• Visual Inspection: 100% checked for molding defects, cracks, or surface imperfections
• Packaged Safely: Fan wrapped in protective film, boxed with foam or cardboard inserts to prevent blade damage

• 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

For pricing, availability, or bulk purchase of the Cooling Fan 5136620121 For Isuzu NPR 4HE1 Engine 5-13662012-1 Industrial Fan, please contact our sales team for a competitive quote and expert technical support.