HINO DUTRO 300 WU300 WU302 WU340 WU342 WU410 TOYOTA DYNA 110 130HT W04D W04DT 4.0L OD 78MM 40MM 4-HOLE HUB 7-HOLE BASE ENGINE COOLING WATER PUMP ASSY (OE: 16100-78101 / 1610078101 / 16100-78100 / 16100-E0341 / 16100-E0342 / 16100-E0152)

Overview

The Hino Dutro 300 / Toyota Dyna W04D 7-Hole Engine Water Pump Assembly (Water Pump Assy 16100-78101 / 16100-78100 / 16100-E0341) is a commercial-grade engine cooling system component engineered specifically for Hino Dutro 300 Series and Toyota Dyna light-to-medium commercial transport trucks powered by Hino / Toyota W04D, W04D-T, W04D-TN, and W04D-D (4.0L / 4,009cc) 4-cylinder direct-injection diesel engines (Dutro WU300, WU302, WU340, WU342, WU410, WU420, 110HD, 130HT, and Dyna WU300, WU302, WU340, WU410, WU422 commercial cargo lorries, wooden body trucks, tippers, and box vans). Built in the 7-hole mounting base configuration, this cast iron water pump features a pre-installed 4-hole threaded pulley/fan mounting flange hub (78mm outer diameter with a 40mm conical pilot step), reinforced bearing neck with structural support ribs, and high-flow internal impeller designed to deliver continuous, high-volume coolant circulation through the engine block, cylinder head, and radiator. Replacing a worn, noisy, bearing-seized, or leaking water pump prevents engine overheating, head gasket failure, and downtime under continuous commercial haulage.

Key Dimensions (As Labeled in Product Photos)

• Top Pulley / Fan Hub Configuration: Pre-installed CNC-machined steel mounting flange featuring 4 threaded bolt holes, 78mm flange outer diameter, 40mm stepped/conical pilot register, and a precision center bearing cap.

• Mounting Base Configuration: 7-hole perimeter mounting flange base for direct installation onto the engine block / timing case water passage cavity.

• Housing Material: Heavy-duty black-coated cast iron body with external triangular reinforcing ribs around the bearing neck and a lower bearing weep pocket.

• Measurement Notice: Key specifications including the 78mm top hub outer diameter, 40mm pilot step, 4-hole threaded hub, and 7-hole mounting base layout are shown directly in our product photos.

• Please verify your existing water pump top flange diameter (78mm), pilot step (40mm), and mounting base hole count (7-hole vs. 6-hole) against our product photos before ordering.

Compatible Truck Models & Engine Applications

• HINO DUTRO 300 COMMERCIAL TRUCKS:

  • Dutro 300 Series (WU300, WU302, WU340, WU342, WU410, WU420, 110HD, 130HT Commercial Cargo Lorries, Wooden Body Trucks, Tippers & Box Vans)

• TOYOTA DYNA & TOYOACE COMMERCIAL TRUCKS:

  • Dyna 200 / 300 / 400 Series (WU300, WU302, WU340, WU410, WU420, WU422, Dyna 110, Dyna 125, Dyna 130HT, Dyna 140)

• Engine Application:

  • Hino / Toyota W04D (4.0L / 4,009cc Inline-4 Naturally Aspirated Direct Injection Diesel)

  • Hino / Toyota W04D-T / W04D-TN / W04D-D (4.0L Inline-4 Turbocharged Direct Injection Diesel)

• OEM & Cross-Reference Part Numbers:

  • 16100-78101 / 1610078101 (Hino / Toyota Genuine OEM)

  • 16100-78100 / 1610078100

  • 16100-E0341 / 16100E0341

  • 16100-E0342 / 16100E0342

  • 16100-E0152 / 16100E0152

  • S1610-078101 / S1610-0E0341

• (Note: Hino Dutro WU300 and Toyota Dyna W04D engines use two distinct water pump mounting bases: this 16100-78101 / 16100-78100 unit features a 7-hole base, whereas alternative W04D / N04C variants utilize a 6-hole base [16100-78110 / 16100-E0040] or an 8-hole base. Always count the bolt holes on your old sample pump base [7 holes] and verify the 78mm / 40mm top hub prior to ordering.)

Why Choose Our Commercial Truck Parts?

• Pre-Installed 78mm / 40mm 4-Hole Flange Hub: Factory-pressed, CNC-machined steel hub with 4 tapped mounting holes ensures concentric pulley/fan alignment and eliminates belt runout or vibration.

• Precision 7-Hole Mounting Base: CNC-machined flat sealing face ensures an exact, flush fit against the engine timing case without coolant leakage.

• Heavy-Duty Cast Iron Housing: Thick-walled iron casting with reinforcing ribs resists engine vibration, high thermal stress, and fatigue cracking during heavy commercial operation.

• High-Grade Bearing & Mechanical Shaft Seal: Engineered to withstand continuous fan belt radial tension and elevated cooling system pressures without developing shaft play or premature weepage.

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

Need Help Confirming Fitment?

Unsure whether this 16100-78101 7-hole water pump matches your Dutro or Dyna truck engine setup?

• Check your old pump against the 78mm / 40mm 4-hole top hub and 7-hole mounting base shown in our pictures.

• Or send your Chassis Number (VIN) / Engine Model (W04D) / Base Bolt Hole Count (7 holes) / sample photos to our team via WhatsApp for instant confirmation!