ISUZU FORWARD F-SERIES FTR32 FTR33 FVR32 FVR33 FSR32 FSR33 FRR32 6HH1 6HE1 6HE1-T 8.2L 7.1L DIESEL 4-BELT PULLEY ENGINE COOLING WATER PUMP ASSY (OE: 1-87602-781 / 1-87602-781-0 / 1876027810 / 8-97602-781-0 / 8976027810 / GWIS-42A)

Overview

The Isuzu Forward 6HH1 / 6HE1 4-Belt Pulley Engine Water Pump Assembly (Water Pump Assy 1-87602-781 / 1-87602-781-0 / 8-97602-781-0 / GWIS-42A) is a commercial-grade engine cooling system component engineered specifically for Isuzu Forward F-Series medium-to-heavy commercial transport trucks powered by Isuzu 6HH1 (8.2L / 8,226cc) and 6HE1 / 6HE1-T (7.1L / 7,127cc) 6-cylinder OHC direct-injection diesel engines (Isuzu FTR32, FTR33, FVR32, FVR33, FSR32, FSR33, FRR32 commercial cargo lorries, wooden body trucks, tippers, dump trucks, and box vans). Built with an integrated 4-belt (4-groove) drive pulley, high-strength volute housing, precision multi-bolt mounting base, and high-efficiency internal impeller configuration, this water pump delivers continuous, pressurized coolant circulation through the cylinder block, cylinder head, and radiator. Replacing a worn, noisy, bearing-seized, or leaking water pump restores optimal operating temperatures, preventing engine overheating, cylinder head warping, and blown head gaskets under sustained commercial payloads.

Key Dimensions & Specifications

• Drive Pulley Configuration: Factory-installed 4-belt (4-groove) drive pulley engineered for multi-belt V-belt / ribbed drive belt engagement and balanced rotation.

• Mounting Base Configuration: Precision multi-bolt perimeter mounting flange base with a flat CNC-machined rear sealing surface for direct installation onto the engine timing case / front block water passage cavity.

• Internal Seal & Bearing Assembly: High-capacity sealed roller/ball bearing assembly paired with a heat- and wear-resistant silicon-carbide/carbon mechanical shaft seal to withstand high multi-belt radial loads.

• Coolant Flow Design: High-efficiency cast internal impeller designed for continuous, high-volume coolant displacement across the 6-cylinder block and engine oil cooler.

• Please verify your existing water pump pulley groove count (4-belt), mounting bolt layout, and side coolant ports against your old sample pump before ordering.

Compatible Truck Models & Engine Applications

• ISUZU FORWARD F-SERIES COMMERCIAL TRUCKS:

  • FTR Series (FTR32, FTR33 Commercial Cargo Lorries, Wooden Body Trucks & Tippers)

  • FVR Series (FVR32, FVR33 Heavy Cargo Lorries & Tippers)

  • FSR Series (FSR32, FSR33 Medium Commercial Trucks & Box Vans)

  • FRR Series (FRR32, FRR33 Commercial Lorries)

• Engine Application:

  • Isuzu 6HH1 / 6HH1-S / 6HH1-N (8.2L / 8,226cc Inline-6 SOHC Naturally Aspirated Diesel)

  • Isuzu 6HE1 / 6HE1-T / 6HE1-TC (7.1L / 7,127cc Inline-6 SOHC Diesel / Turbo Diesel)

• OEM & Cross-Reference Part Numbers:

  • 1-87602-781 / 1-87602-781-0 / 1876027810 (Isuzu Genuine OEM)

  • 8-97602-781-0 / 8976027810

  • 1-87602-781-1 / 1876027811

  • 1-13610-819-0 / 1136108190

  • GMB: GWIS-42A / GWIS42A

• (Note: Isuzu 6H-series engines [6HE1, 6HH1, 6HK1] utilize several water pump configurations depending on chassis year and belt drive arrangement [such as bare flange hub versions, 2-belt pulleys, 3-belt pulleys, and 4-belt pulleys]. This 1-87602-781 unit is specifically configured with the 4-belt pulley assembly for 6HH1 / 6HE1 engines. Always verify your pulley groove count [4 belts] and compare against your old sample pump prior to ordering.)

Why Choose Our Commercial Truck Parts?

• Integrated 4-Belt Pulley: Factory-fitted 4-groove pulley ensures concentric alignment and smooth power transmission across all drive belts, preventing premature belt slip, vibration, and uneven belt wear.

• High-Flow 6-Cylinder Coolant Circulation: Dynamically balanced impeller provides continuous, pressurized coolant circulation through the engine block and oil cooler, eliminating hot spots under sustained hauling loads.

• Reinforced Bearing & Mechanical Seal: High-capacity sealed bearing cartridge and premium mechanical shaft seal withstand high multi-belt radial tension and cooling system pressures without developing shaft play or coolant weepage.

• Precision CNC-Machined Mounting Face: Flat-machined sealing surface ensures direct bolt-on installation with dependable, leak-free gasket sealing against the engine block.

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

Need Help Confirming Fitment?

Unsure whether this 4-belt water pump matches your Isuzu truck's existing 6HH1 or 6HE1 engine setup?

• Check your old pump against the 4-belt pulley grooves, mounting base pattern, and port layout.

• Or send your Chassis Number (VIN) / Engine Model (6HH1 / 6HE1) / Pulley Belt Count (4 belts) / sample photos to our team via WhatsApp for instant confirmation!