ISUZU GIGA C-SERIES E-SERIES CXZ CYZ CYH CYJ EXZ EXR 6WA1 6WF1 6WG1 12.0L 14.2L 15.7L ENGINE COOLING WATER PUMP ASSY WITH DRIVE GEAR & O-RING SEALS (OE: 1-13650-057-0 / 1-13650-057-2 / 1136500570 / 1-87310-998-0 / 8-98146-073-0)

Overview

The Isuzu Giga 6WA1 6WF1 6WG1 Heavy-Duty Engine Water Pump Assembly (OE: 1-13650-057-0 / 1-13650-057-2 / 1136500570 / 1-87310-998-0 / 8-98146-073-0) is a commercial-grade engine cooling system component engineered specifically for Isuzu Giga C-Series and E-Series heavy transport trucks powered by Isuzu 6WA1 (12.0L), 6WF1 (14.2L), and 6WG1 (15.7L) 24-valve 6-cylinder diesel engines (CXZ, CYZ, CYH, CYJ, EXZ, and EXR series heavy tippers, prime movers, concrete mixers, and heavy haulers, as well as Hitachi ZAXIS ZX450-3 / ZX470-3 heavy excavators).

Built with a high-strength cast alloy housing, integrated helical drive gear, precision-balanced internal multi-vane impeller, and heavy-duty mechanical seal, this pump delivers continuous, high-pressure coolant circulation across massive 12.0L–15.7L engine blocks to prevent cylinder liner cavitation, head gasket blowout, and thermal overheating under extreme payloads. Supplied complete as a direct bolt-on assembly with gear and O-ring seals, eliminating the need to press-fit old gears.

Key Specifications & Technical Features

• Drive Configuration: Direct timing gear driven (Complete assembly with pre-installed heavy-duty helical drive gear; no pressing required).

• Mounting Type: Direct timing gear casing flange mount with precision circular spigot pilot and sealing O-ring groove.

• Impeller Design: Precision-cast multi-vane high-volume internal impeller engineered for high displacement under heavy loads.

• Cooling Ports: High-flow discharge port with factory mounting flange, integrated block cooling passages, and drain/service port.

• Sealing Protection: Industrial-grade ceramic/carbon mechanical water seal resisting high operating temperatures and commercial coolant corrosion.

• Fitment Verification: Please compare your existing water pump casting profile, mounting bolt pattern, and drive gear teeth against our product photos before ordering.

Compatible Truck Models & Engine Applications

• ISUZU GIGA COMMERCIAL TRUCKS (C-Series & E-Series):

  • Prime Movers / Tractor Heads (EXZ51, EXZ52, EXR)

  • Heavy Tippers & Dump Trucks (CXZ, CYZ51, CYZ52)

  • Multi-Axle Cargo Lorries & Mixers (CYH, CYJ, CXM)

• HEAVY EXCAVATORS & INDUSTRIAL EQUIPMENT:

  • Hitachi Heavy Excavators (ZAXIS ZX450-3, ZX470-3, ZX470-5G, ZX650-3, ZX850 running Isuzu 6WG1 / 6WA1 engines)

  • John Deere Heavy Excavators (450D, 650D, 850D running Isuzu 6WG1 engine)

• Engine Models:

  • Isuzu 6WA1 / 6WA1-TC (12.0L Inline-6 Turbo Diesel)

  • Isuzu 6WF1 / 6WF1-TC (14.2L Inline-6 Common Rail Turbo Diesel)

  • Isuzu 6WG1 / 6WG1-TC (15.7L Inline-6 Turbo Diesel / Euro 3 / Tier 3)

• OEM & Cross-Reference Part Numbers:

  • 1-13650-057-0 / 1-13650057-0 / 1136500570

  • 1-13650-057-2 / 1-13650057-2 / 1136500572

  • 1-87310-998-0 / 1-87310998-0 / 1873109980

  • 8-98146-073-0 / 8-98146073-0 / 8981460730

  • 1-87310-957-0 / 1-87310-780-0 / 1-87610-865-0

Why Choose Our Commercial Truck Parts?

• Pre-Assembled Drive Gear: Comes fully assembled with the timing drive gear, saving workshop labor time and avoiding gear alignment or press damage.

• Anti-Cavitation Flow Design: High-efficiency impeller maintains consistent cooling pressure across low and high RPM ranges, preventing engine hot spots on steep mountain climbs.

• Heavy-Duty Bearing Support: Reinforced bearing housing withstands continuous gear thrust loads and high-torque engine vibrations.

• Complete Sealing Package: Supplied complete with mounting gasket and O-ring seals for a 100% leak-proof installation.

• Fast Dispatch: Ready stock available for immediate dispatch across Peninsular Malaysia, Sabah, and Sarawak.

Fitment Confirmation Support

Need help verifying compatibility with your lorry or excavator?

• Send your Chassis Number (VIN), Engine Nameplate Photo (6WA1 / 6WF1 / 6WG1), or Old Sample Water Pump Photo to our team via Chat/WhatsApp for instant technical confirmation!