High-Strength Aluminum Alloy Water Pump with Precision Impeller for HINO EF500 J08C-H Engine - Direct-Fit Replacement

The Engine Water Pump with OEM number 16100-E0333 (16100E0333) is a verified direct-fit replacement designed for HINO EF500 trucks equipped with the J08C-H 7.7L inline-6 diesel engine. This water pump serves as the heart of the engine cooling system, responsible for circulating coolant through the engine block, cylinder head, and radiator to maintain optimal operating temperature under all load conditions.

The water pump functions as a mechanical belt-driven centrifugal pump. As the engine rotates, the drive belt turns the pump pulley, which rotates the impeller inside the pump housing. The impeller draws coolant from the radiator, forces it through the engine water jackets to absorb combustion heat, and returns it to the radiator for cooling. This continuous circulation is critical — without adequate coolant flow, engine temperatures rise rapidly, leading to overheating, warped cylinder heads, and catastrophic engine failure.

• Material Construction: High-strength aluminum alloy housing with precision-machined impeller and long-life sealed bearings — verified by material certification and dimensional inspection.
• OEM-Equivalent Flow Rate: Engineered to match OEM coolant flow capacity for reliable thermal regulation under heavy-duty operating cycles.
• Direct Bolt-On Fitment: OEM-style mounting and pulley alignment — verified across fleet maintenance programs serving HINO 500 Series trucks.
• Service Life: Comparable OEM water pumps for J08C engines are rated for replacement every 150,000–200,000 km under normal operating conditions with proper coolant maintenance.
• OEM Cross-Reference Verified: Replaces HINO OEM number 16100-E0333 / 16100E0333. Related part numbers for the J08C engine family include 16100-E0521, 16100-3464, 16100-3465, 16100-3466, 16100-3467.

Water pump failure manifests through several recognizable symptoms. Replacing at the first sign prevents overheating-related engine damage and costly downtime:

1. Coolant leakage — visible drips or puddles beneath the front of the engine, often from the weep hole on the pump housing. This indicates seal failure and imminent pump breakdown.
2. Overheating at operating RPM — engine temperature rises abnormally during mid-range RPM operation (e.g., around 2,300 RPM), especially under load. This indicates insufficient coolant circulation.
3. Abnormal bearing noise — grinding, rumbling, or squealing sounds from the front of the engine, caused by worn internal bearings. This noise typically worsens as engine speed increases.
4. Coolant pooling and low coolant alarm — in severe cases, air can enter the cooling system, forcing coolant out of the overflow and triggering low coolant warnings.
5. Erratic temperature gauge readings — temperature fluctuates rapidly or rises during high-load conditions, indicating unstable coolant flow.

1. Drain the cooling system completely and dispose of old coolant according to local regulations.
2. Remove the drive belt(s) — note the routing for reinstallation. Inspect belts for wear and replace if necessary.
3. Remove the old water pump — disconnect hoses, remove mounting bolts evenly, and carefully separate the pump from the engine block. Clean the mating surface thoroughly.
4. Inspect the timing cover and block for corrosion, pitting, or gasket residue. Replace the gasket with a new OEM-specification gasket.
5. Install the new water pump — apply a thin layer of RTV sealant if specified. Align the pump with mounting holes and pulley grooves. Torque specification: Consult the HINO J08C workshop manual for the exact torque value. As a general reference for comparable HINO water pump applications, mounting bolts are typically tightened to 20–25 Nm. Do not over-tighten — excessive torque can crack the aluminum housing.
6. Reinstall the drive belt(s) and verify proper tension and alignment.
7. Refill with coolant — use HINO-approved coolant at the correct concentration. Bleed the cooling system completely to remove air pockets.
8. Run the engine and check for leaks. Verify proper temperature regulation and coolant circulation.

• Coolant replacement: Every 2 years or 40,000 km using HINO-approved coolant.
• Belt inspection: Check drive belt condition at every oil change. Replace if cracking, glazing, or excessive wear is visible.
• Water pump inspection: Check for leakage, bearing noise, and proper pulley rotation at every major service interval.
• Replacement interval: Every 150,000–200,000 km or if coolant leakage, bearing noise, or overheating is observed.

• Each water pump is protected with anti-rust coating and wrapped in foam padding, then packed in a heavy-duty cardboard box.
• Suitable for: Fleet maintenance departments, diesel engine repair shops, parts distributors, and wholesale buyers.
• MOQ: 5 pieces. Bulk pricing available.
• Supply capacity: 200 pieces/day.