Isuzu 4HK-1 Engine Service Manual
-Engine Mechanical Features-Engine Control System & Diagnosis
A – Multi fuel injection type high-pressure common rail
system and is made with Denso.
B – Single overhead camshaft (OHC) with 4 valves per a
cylinder.
C – Electrical control EGR valve, water-cooled EGR
cooler.
D – Turbocharger with intercooler.
The part numbers in this Part’s Catalog were correct at the time of publication. Therefore, when ordering parts, verify the part numbers with your dealer.
John Deere Model: 4HK1
Type: Parts Catalog
Serial Number: All
Language: English
Format: PDF
This document provides information about the 4HK1-TC engine, which replaced the 4HE1-TC engine in Isuzu NPR and NQR trucks starting in the 2005 model year. Some key changes to the 4HK1-TC include increasing the bore size, switching to a common rail fuel injection system, adding a water-cooled EGR system, and changing to a 4-valve-per-cylinder design. The 4HK1-TC has higher maximum output and torque compared to the previous 4HE1-TC engine. The document lists the major mechanical differences between the two engines and provides specifications and details about the components and systems of the 4HK1-TC.
The part numbers in these Parts Catalog (PC11128) were correct at the time of publication. Therefore, when ordering parts, verify the part numbers with your dealer.
Isuzu 4HK-1 Engine Service Manual
SI Units of Measure
Metric dimensions are provided as applicable throughout this parts catalog.
Bolt and Cap Screw Strength Identification
Bolts and cap screws required to have high-strength qualities equivalent to metric property class 10.9 (SAE grade 8) or higher are identified throughout this catalog by the description 10.9, 12.9 or 14.9. All standard bolts and cap screws are metric property class 8.8 (SAE grade 5) or lower.
Serial Number Listing Information
Serial number information is listed to show on which machines each part can be used for example:
The part can be used on products beginning with the serial number listed.
The part can be used on products up to and including the serial number listed.
The part can be used on products between and including the serial number listed.
