GT2560S Turbocharger for Isuzu Truck Elf N Series 4HK1 Engine
97310502, 700716-5018, 700716-0008, 700716-0012, 8973105020, 8973105021, 8973105022, 8973105023
Isuzu Turbocharger
New IHI Replacement Turbochargers for Isuzu NPR, NQR and NRR N-Series Commercial Trucks
Isuzu N-Series cabover trucks — the NPR, NQR and NRR — are the backbone of urban delivery, landscaping, box truck and small fleet operations across North America. They are also sold as GMC W-Series trucks with the same Isuzu diesel engine and the same turbocharger. The turbo on these trucks is manufactured by IHI, and it comes in several configurations depending on the engine variant, emissions tier and model year. We stock brand new replacement turbochargers for both Isuzu 4HK1 5.2L engines (GT2560S and RHF55V models) and the smaller 4JJ1 3.0L (RHF5V). Every unit is new-built to OEM-spec dimensions with the electronic wastegate actuator included where applicable, and matched by the Isuzu or IHI part number before shipping. Shops, fleets and distributors order from US stock.
- 100% Brand New
- OEM-Spec Quality
- US Stock, Fast Dispatch
- Direct-Fit Replacement
- Exact Part-Number Match
- 1-Year Warranty
- No Core Charge
NPR, NQR and NRR Turbos Matched by IHI Part Number
Isuzu cabover trucks are simple machines built for daily commercial use — and turbo failure shuts down the route. The challenge on this platform is part number confusion: the 4HK1 engine ran multiple turbo configurations across emissions tiers, and the IHI turbo part number system (VDA, VCA, VBA, VAA prefixes) is unfamiliar to shops that usually work on Garrett or Holset units. We sort that out before the part ships.
GT2560S and RHF55V for Every 4HK1 Variant
Every Isuzu turbo we ship is 100% new — not remanufactured. The electronic wastegate actuator is included and pre-installed where the application requires one. No core deposit, no old unit to return. Dealer-list pricing on these turbos runs high; a new quality replacement at a fraction of that cost gets the truck back on route the same day.
RHF5V for the Smaller 4JJ1 Platform
We stock the GT2560S for early 4HK1 Elf and N-Series models, two generations of the RHF55V for the 4HK1 5.2L (covering NPR-HD, NPR-XD, NQR and NRR from 2005 through 2019+), and the smaller RHF5V for the 4JJ1 3.0L engine in the NLR, NMR and lighter NPR models.
12V and 24V Actuator Voltage Verified
The RHF55V comes in 12-volt and 24-volt actuator variants. The wrong voltage will not operate the wastegate correctly. We identify the correct variant by the last digits of the Isuzu part number and the engine sub-code (4HK1-TCN vs 4HK1-TCS) before dispatch.
GMC W-Series Cross-Referenced
The GMC W3500, W4500 and W5500 are rebadged Isuzu N-Series trucks with the same 4HK1 engine and the same IHI turbo. We cross-reference both Isuzu and GMC part numbers — same turbo regardless of badge.
Ships New With Actuator Included
IHI uses a prefix-based numbering system (VDA40026, VCA40026, VBA40026, VAA40026) that corresponds to different build revisions. We match by the full IHI number or the Isuzu 10-digit part number stamped on the old turbo to ensure the correct revision ships.
Supply for Cabover Fleet Operations
One-year warranty on every unit, handled by our US team. Before install, check the oil feed line for carbon restriction — the 4HK1 is prone to feed line coking at high hours, and a restricted line kills the new turbo's bearings in months. See the warranty page.
GT2560S and RHF55V for Every 4HK1 Variant
Every Isuzu turbo we ship is 100% new — not remanufactured. The electronic wastegate actuator is included and pre-installed where the application requires one. No core deposit, no old unit to return. Dealer-list pricing on these turbos runs high; a new quality replacement at a fraction of that cost gets the truck back on route the same day.
RHF5V for the Smaller 4JJ1 Platform
We stock the GT2560S for early 4HK1 Elf and N-Series models, two generations of the RHF55V for the 4HK1 5.2L (covering NPR-HD, NPR-XD, NQR and NRR from 2005 through 2019+), and the smaller RHF5V for the 4JJ1 3.0L engine in the NLR, NMR and lighter NPR models.
12V and 24V Actuator Voltage Verified
The RHF55V comes in 12-volt and 24-volt actuator variants. The wrong voltage will not operate the wastegate correctly. We identify the correct variant by the last digits of the Isuzu part number and the engine sub-code (4HK1-TCN vs 4HK1-TCS) before dispatch.
GMC W-Series Cross-Referenced
The GMC W3500, W4500 and W5500 are rebadged Isuzu N-Series trucks with the same 4HK1 engine and the same IHI turbo. We cross-reference both Isuzu and GMC part numbers — same turbo regardless of badge.
Ships New With Actuator Included
IHI uses a prefix-based numbering system (VDA40026, VCA40026, VBA40026, VAA40026) that corresponds to different build revisions. We match by the full IHI number or the Isuzu 10-digit part number stamped on the old turbo to ensure the correct revision ships.
Supply for Cabover Fleet Operations
One-year warranty on every unit, handled by our US team. Before install, check the oil feed line for carbon restriction — the 4HK1 is prone to feed line coking at high hours, and a restricted line kills the new turbo's bearings in months. See the warranty page.
WHY CHOOSE US
The right Isuzu turbo, matched and shipped fast
We verify the IHI part number and actuator voltage before dispatch, hold the common NPR/NQR/NRR turbos on a US shelf, and answer fitment questions after the sale. One truck or a fleet of cabovers — same process. More about our company and quality process.
FAQ
It depends on the engine variant and model year. Early 4HK1 models use the GT2560S. The 2005-2009 NPR with the 5.2L 4HK1 uses the first-generation RHF55V (Isuzu 8980277725). The 2011-2019+ NPR-HD, NPR-XD, NQR and NRR use updated RHF55V revisions (8981479061, 8982490470 and later numbers). The smaller 3.0L 4JJ1 NPR uses the RHF5V. Match by the IHI or Isuzu part number on the old turbo's dataplate — model year alone is not reliable because mid-year changes exist.
Yes. Every RHF55V we sell includes the electronic wastegate actuator pre-installed, matched to the correct voltage (12V or 24V) for your application. The GT2560S and RHF5V configurations include their respective actuators as well.
Yes. The GMC W3500, W4500 and W5500 are the same trucks as the Isuzu NPR, NQR and NRR, built on the same assembly line with the same 4HK1 engine and the same IHI turbo. We cross-reference both GM and Isuzu part numbers.
Check the engine sub-code on the engine dataplate. The 4HK1-TCN typically uses 12V; the 4HK1-TCS uses 24V. You can also check the voltage on the actuator connector with a multimeter, or give us the full Isuzu part number and we will confirm.
All units are 100% brand new — not remanufactured, not rebuilt. New CHRA, new wheels, new actuator. No core charge, nothing to return. One-year warranty.
Yes. Fleets running Isuzu cabovers — delivery services, landscape companies, municipal operations — order on a regular replacement cycle. Consistent wholesale pricing from US stock. See the wholesale page.
Isuzu N-Series Turbocharger Guide
The Isuzu NPR, NQR and NRR form the largest fleet of medium-duty cabover trucks in North America, and they all run turbocharged Isuzu diesel engines. Understanding which turbo configuration your truck runs — and navigating the IHI part number system — is the key to ordering the right replacement.
Isuzu Diesel Engines and Their Turbochargers
| Engine | Displacement | Turbo | Applications |
|---|---|---|---|
| 4HK1 (early) | 5.2L | GT2560S | Elf, early N-Series |
| 4HK1 (2005-2009) | 5.2L | RHF55V (8980277725) | NPR, NQR, NRR |
| 4HK1-TCN/TCS (2011+) | 5.2L | RHF55V (8981479061+) | NPR-HD, NPR-XD, NQR, NRR |
| 4JJ1 | 3.0L | RHF5V | NLR, NMR, light NPR |
Understanding IHI Part Numbers
IHI uses a prefix system that confuses shops familiar with Garrett or BorgWarner numbering. The turbo model (RHF55V) stays the same, but the full part number changes with each revision. A typical IHI number like VDA40026 breaks down as: V = variable geometry family, D = revision level (A through D, with D being newer), A = sub-variant, 40026 = base application number. The Isuzu 10-digit number (like 8981479061) is a separate cross-reference. Either number works for ordering — we match both.
The 12V vs 24V Actuator Split
The RHF55V uses an electronic wastegate actuator, and it comes in 12-volt and 24-volt versions. The 4HK1-TCN engine code typically pairs with the 12V actuator; the 4HK1-TCS pairs with 24V. Installing the wrong voltage actuator will not blow a fuse or cause immediate damage, but the wastegate will not respond correctly — boost control will be erratic, fuel economy drops, and fault codes will set. Check the engine sub-code on the dataplate before ordering.
Common Failure Patterns on the 4HK1
The 4HK1 turbo typically fails from bearing wear at high hours — these trucks run hard in stop-and-go city routes with frequent idle time. Oil feed line coking is the leading accelerator: carbon from degraded oil gradually restricts the line, starving the turbo bearings of lubrication. Wastegate actuator failure is the second most common issue, usually from heat damage or electrical connector corrosion. When replacing the turbo, flush or replace the oil feed line and inspect the actuator connector for corrosion before installing the new unit.
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