Place of Origin:
China
Brand Name:
Isuzu
Model Number:
4HK1
A single turbocharger assembly for the Isuzu 4HK1 5.193L inline-four engine, catalogued in two distinct frames: a variable nozzle RHF55V unit for machine duty and a fixed wastegate GT2560LS unit for light truck duty. Both share the same manifold face but are not interchangeable. This listing covers the RHF55V 8981479061 and RHF55 8973628390 references, with the electronic actuator supplied only when specified on the order.
| Product Name | Turbocharger Assembly |
|---|---|
| Engine | 4HK1 family at 5193 cc |
| Layout | Inline four, water cooled, four stroke, overhead valve |
| Bore And Stroke | 115 mm by 125 mm |
| Valves | 16, four per cylinder |
| Chargers Per Engine | One |
| Frames Listed | Variable nozzle RHF55V and fixed wastegate GT2560LS |
| Torque Reference | 402 N*m between 1500 and 2600 rpm on the TCN build |
| Actuator | Electronic module, supplied only when the order says so |
| Freight | Foam cradle, ports capped, actuator braced against the housing |
| Two Frames On One Block | The machine duty runs a variable nozzle frame while the light truck duty runs a fixed wastegate frame. Although both meet the same manifold face, they do not swap. |
|---|---|
| Nearest Lookalike | 4KH1 is a three-litre unit of a different family and takes a smaller frame, so any listing quoting 600P or NKR77 sits under that engine rather than this one. |
| Six Cylinder Neighbour | 6HK1 shares the bore and stroke but adds two cylinders and a larger charger; neither number transfers. |
| Five Number Groups | 8-98147, 8-97362, 8-98259, 1-87618258 and 1-87618326 form five separate groups — a quotation for one says nothing about the rest. |
| Actuator Modules | K6T51271 and K6T51275 are the electronic units; plenty of stock arrives bare without either. |
| Version Letters | TC, TCN, TCS and E2N differ by emissions hardware; the charger follows the version rather than the block. |
| Machine Coverage | ZX200-3, ZX240-3, ZX210W, ZX220W, ZX250LC-3, ZX270-3 and ZX280L-3 for Hitachi; SH240 for Sumitomo; JS200 through JS260 for JCB. |
| Caution — Two Fault Signs | A sticking nozzle shows as weak pull away from idle, while a split wastegate diaphragm shows as overboost at the top end. Treating one as the other buys a unit nobody needed. |
| Caution — Feed Screen | The oil feed union hides a fine screen that cakes with carbon; a fresh unit dies within hours when that screen is left alone. |
| Caution — Stretched Studs | Exhaust studs stretch after heat cycles, so reusing them produces a flange leak within a season and a false diagnosis of the new unit. |
| Related Components | Cartridge, nozzle ring, actuator, gasket kit, oil feed line, oil return pipe, air inlet hose, exhaust flange studs. |
One, because it is an inline four with a single exhaust manifold. Confusion arrives from listings that bundle it with the six-cylinder 6HK1, which carries a bigger unit and cannot share it.
Because the same block serves two very different lives. A machine needs boost the moment the operator moves a lever, so it gets a variable nozzle frame. A light truck cruises at steady speed, so a simpler wastegate frame is enough.
Someone chasing a charger for 600P or NKR77 lands on this page, although those trucks run the three-litre 4KH1 and a physically smaller frame.
1-87618258-0 for ZX200-3 and ZX240-3, and 8976513270 for ZX210W and ZX220W.
The electronic actuator module.
Only when the order says so.
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