Isuzu Truck Engines

Isuzu diesel engines are noted for reliability and durability and have stood the test of time. Isuzu is a leader in diesel engine technology and industries across the globe choose their diesel engines. Customers also love the fact that Isuzu continuously advanced its diesel engine technology raising the standards for low noise and low pollution diesel engines.

The characteristic features of Isuzu diesel engines include fuel economy, high rate of heat to power conversion, durability, and powerful torque across a wide range of speeds. Isuzu diesel engines are used in a wide range of applications. The reason for this flexibility is the power output capacity of the diesel engines ranging from tens to thousands of horsepower. The engines are used to power up everything from passenger cars, trucks, ships, and construction equipment to land mowers, motorboats, farm tractors, snowplows, supertankers, and power generators. No other internal combustion engine so far offers such a wide range of applications. The entire range of Isuzu diesel engines is synonymous with performance and reliability owing to the hard work and determination of the Isuzu engineers.

History of Isuzu

Isuzu, one of the world’s leading automobile manufacturers with a dominant presence in the commercial vehicle, utility vehicle, and diesel engine segments traces its beginnings to 1916.

1916: Founded in 1916 in Tokyo, Japan when Tokyo Ishikawajima Shipbuilding and Engineering Co. and Tokyo Gas and Electric Industrial Co. initiated plans for automobile production.

1922: Japan’s first domestically produced automobile, Wolseley A-9 launched.

1933: Ishikawajima Automotive Works merged with DAT Automobile Manufacturing Inc., and named the company Automobile Industries Co., Ltd.

1934: Ministry of trade and the industry-standard model car launched and named the company Isuzu after the ISUZU River in the ISE Shrine area. Established a diesel research committee.

1936: Manufactured Japan’s first air-cooled diesel engines, the DA6 and DA4. It marked the breakthrough in the history of diesel engine development.

1937: Automobile Industries merged with two other companies to form Tokyo Automobile Industries Co. Ltd.

1941: Japanese government designated Tokyo Automobile Industries to manufacture diesel-powered vehicles.

Postwar Era: Isuzu Motors developed DA80 diesel, the first V8 engine. Additionally, Isuzu developed a pre-combustion chamber, which considerably improved through wartime to the postwar era as the industry's standard indirect-injection combustion chamber.

The company also developed a direct-injection combustion chamber with advanced configuration. This engine model offered high performance and attracted the industry's attention.

1955 to 1964: Launched bonnet-type truck in 1959 with the DA640 diesel engine. It boasted rugged performance and excellent fuel economy on bumpy roads and extra durability even for an overloaded truck. In 1961, diesel engine DL201 for passenger cars developed. Rolled out DL200 model diesel engine in 1964 with excellent economy and durability.

1965 to 1974: Backed by a fast-growing economy and enhanced transportation infrastructure, Japan entered the age of high-speed transportation. The U.S. dollar crisis in 1971 and the first oil crisis in 1973 forced auto manufacturers to develop energy-efficient vehicles. To cope with the trend, in 1973, Isuzu developed a low-emission, light-weight, and high output, PA diesel engine model in the V Series lineup.

1957 to 1984: The second oil crisis in 1979 further resulted in the implementation of energy-saving measures. The automotive companies saw an increasing number of customers asking for vehicles with enhanced safety, low pollution, high output, and good fuel economy. Responding to this, in 1981, Isuzu rolled out ten-ton payload trucks equipped with high-torque, fuel-saving turbocharged diesel engines, 8PB1-T and 6RA1-T. Later in 1983, a new heavy-duty truck diesel engine 810 series released. The new series included an electronically controlled 6RA1-TC turbocharged model and an intercooled design boasting enhanced displacement. With this, Isuzu led the industry in direct-injection diesel engines for light-duty trucks.

Isuzu also developed the world’s first full-scale electronically controlled diesel engines for both light and heavy-duty trucks. In 1981, Isuzu developed the Ultra Quick on Start (QOS) system eliminating preheating time. The system incorporated a newly-developed ceramic glow plug with high heat resistance and electronic control.

Current Operations: Today, Isuzu has the top share in sales of stand-alone diesel engines in the Japanese industrial engine market and is equally successful overseas. The company supplies diesel engines to more than 120 companies around the world through its production network encompassing Europe, North America, Asia, and Japan.

Isuzu spares no efforts to develop low impact clean diesel engines and they are highly accepted and praised in the global market. The excellent automotive companies in Europe and the USA count on the Isuzu diesel engine for its superior performance and excellent fuel economy. This is a clear endorsement of the overall high quality and excellent environmental engineering of Isuzu diesel engines. The Isuzu diesel truck engines are synonymous with reliability, performance, and long life, even if they are second hand. We here at Nationwide Truck Parts sell used Isuzu diesel truck engines for trucks. So, if you are looking to buy used engines, we are your go-to engine provider in Scranton, PA.

Isuzu Diesel Engine Technology

Isuzu’s mission is to deliver inspired products and services committed to exceeding expectations. They deliver a cutting-edge, eco-friendly, and fuel-efficient performance to all the customers. The Isuzu diesel engines are innovative and designed such that it monitors each vehicle to see how it is driven to further improve user-friendliness and fuel economy. The trucks are driven under full load and full throttle, Isuzu makes engines with absolutely no compromise in durability and reliability.

Isuzu’s diesel engines are developed with a combination of downsized displacement and turbo boost to drastically optimize engine performance for power, torque, fuel economy, and weight. To further achieve better fuel savings and clean performance, Isuzu continues innovating with cutting-edge technologies such as proprietary electronic control.

The D-Core diesel engines are the next generation engines for trucks taking efficiency to the next level. This engine lineup offers exceptional fuel efficiency and lower CO2 emissions.

Global warming and limited fossil fuel is a serious issue and realizing this, Isuzu focused on lowering emissions and increasing efficiency through small displacement and turbocharged engines. The company has succeeded in raising the engine's performance in terms of fuel economy and weight by increasing output and torque per unit of emissions and designing the engines as light and compact as possible. The experimentation, efforts, and dedication of the company’s engineers reaped the result in form of the D-CORE engine series. This engine series not only meets 2005 emission regulations but fuel economy standards as well giving trucks the power they need to haul long distances without any issue. Isuzu’s original concept, technology, and performance are integrated to become a core of the diesel engine in the years to come. The series includes 4JJ1-TCS Diesel for light-duty trucks, 4HK1 Diesel for medium-duty trucks, and 6UZ1 engine for heavy-duty trucks.

CO2 Reduction Technology

The combustion quality in diesel engines is influenced by how fast and how completely the fuel mixes with the air when it is injected into the combustion chamber. Isuzu has devised two basic systems to improve this mixing: direct-injection and indirect-injection.

Direct Injection

This system injects the fuel directly into the combustion chamber, thus offers good fuel economy. However, the air swirling is not strong enough to achieve an ideal mixture with the fuel. This issue is overcome with specially designed chambers and air-intake ports, and by the use of high-pressure fuel injection. Direct-injection diesel engines have gained immense popularity and are now used in nearly all trucks.

Indirect Injection

This system is currently used in light-duty trucks and passenger cars. The design features a spherical swirl chamber in the cylinder head. The air is forced into the chamber by the piston and begins spinning rapidly allowing a good mix when the fuel is injected.

Intercooler Turbocharger

A turbocharger is a mechanism where the air is supplied to an internal combustion chamber at extremely high pressure through a turbine powered by exhaust gases. This increases the amount of air supplied as well as maintains the exhaust amount at the same level, thus allowing the engine to improve combustion efficiency and power output.

The intercooler is a device that cools off the supplied air, which is heated to a high temperature upon being compressed in the turbocharger. Then, it sends the cool high-density air to the cylinder.

A turbocharged diesel engine generates a high level of output, 20 percent to 50 percent more torque, and improved fuel efficiency. This makes turbocharged engines ideal for vehicles used for long-distance and high-speed transportation.

Quieter, Smoother Diesel Technology

The combustion pressure in the diesel engine cylinder rises intensely and the maximum pressure is extremely high. Due to this, diesel engines produce more noise, vibration, and harshness (NVH). Isuzu is making efforts to reduce the NVH by using the latest technologies.

Pilot Injection System

The rapid rise in combustion pressure is the key source of diesel engine noise. The development of the common rail high-pressure injection system and electronic fuel injection allows flexible and precise control over the fuel injection timing and amount. The rise in fuel pressure is controlled by pilot injection. In this method, a small amount of fuel is injected and ignited just before the main fuel injection process.

Increased Rigidity in Engine Structure

The maximum cylinder pressure in a diesel engine is significantly high and during combustion, the pressure increases rapidly, which is the main cause for vibration and noise. Also, diesel engine components like pistons are solidly built to endure high pressure. The extra weight translates into increased inertia and the scale of vibration. To reduce the level of vibration and noise, Isuzu has reformed the engine structure. A ladder frame is employed with a more rigid crankshaft bearing to reduce the vibrations.

The secondary balancer is used to smooth the vibration of four-cylinder engines. Pair of scissors gear with a similar number of teeth are used to reduce mechanical engine noise. The sides of the flywheel that face the engine and the transmission respectively are fitted with spring and damper to absorb vibrations caused when speed is lowered or increased. A silencer is installed in the intake pipe to reduce air noise drawn into the engine.

With all these technologies in place, Isuzu’s truck diesel engines considerably emit lower CO2 and NOx emissions, as well as being quieter and smoother offering users a great experience.

How Isuzu Diesel Engines Work

The diesel engine is an internal combustion engine in which the air is drawn into the cylinder and highly compressed. After this, the fuel is sprayed into the cylinder under high pressure moving the piston. Ignition occurs spontaneously due to high temperature generated through compression. This converts the fuel’s chemical energy into mechanical energy, which is used to power up trucks, locomotives, large tractors, and marine vessels.

Features of Diesel Engines

  • Fuel Supply System – High-pressure direct injection into the cylinder
  • Air Fuel Mixing – Non-uniform
  • Ignition System – Compression induced spontaneous
  • Thermal Efficiency – High
  • Compression Ratio – 15.5 to 23
  • Output Control System – Controlled by fuel injection amount
  • Durability – Working life of 300,000 to 1,000,000 km or more
  • Performance – Generate flat torque from the low-speed range

Isuzu Engine Line-Up

There are numerous models of Isuzu diesel engines for trucks to choose from. The engine line-up boasts tremendous power, long-term dependability, fuel-efficiency, and is eco-friendly as well.

Here are some of the used Isuzu diesel engine models you can find on Nationwide Truck Parts.

Isuzu 4LE1


  • 4-cycle, water-cooled engine
  • 40 kW power output
  • Interim Tier 4/ EC Stage IIIa emission
  • 2.2-liter displacement
  • 155 kg weight
  • Dimensions (LXWXH) 747mm X 488mm X 602mm

Isuzu 4LE1-T


  • 4 stoke 4-cylinder engine
  • 45 kW/2500 rpm power output
  • Interim Tier 4/Stage 3A emission
  • 2.179-liter displacement
  • 85mm X 96mm Bore X Stroke
  • 190 kg weight
  • Dimensions (LXWXH) 771mm X 507mm X 738mm

Isuzu 4JJ1T


  • 4 stoke 4-cylinder engine
  • 2.999-liter displacement
  • 61 kW/2500 rpm power output
  • Tier 3/Stage 3A emission
  • 95.4mm X 104.9mm Bore X Stroke
  • 320 kg weight
  • Dimensions (LXWXH) 911mm X 739mm X 842mm

Isuzu 4JJ1X


  • 4 stoke 4-cylinder engine
  • 2.999-liter displacement
  • 95 kW/2500 rpm power output
  • Tier 3/Stage 3A emission
  • 95.4mm X 104.9mm Bore X Stroke
  • 320 kg weight
  • Dimensions (LXWXH) 953mm X 748mm X 842mm

Isuzu 6HK1X


  • 4 stoke 6-cylinder engine
  • 7.79-liter displacement
  • 212 kW/2000 rpm power output
  • Tier 3/Stage 3A emission
  • 115mm X 125mm Bore X Stroke
  • 640 kg weight
  • Dimensions (LXWXH) 1222mm X 790mm X 1074mm

Isuzu 4HK1X


  • 4 stoke 4-cylinder engine
  • 5.193-liter displacement
  • 147 kW/2100 rpm power output
  • Tier 3/Stage 3A emission
  • 115mm X 125mm Bore X Stroke
  • 470 kg weight
  • Dimensions (LXWXH) 1019mm X 776mm X 1034mm

Isuzu 4HE1TC


  • In-line 4 stoke 4-cylinder engine
  • 4.75-liter displacement
  • 142 HP at 2800 RPM power output
  • Turbocharged and Intercooled
  • Direct injection
  • Compression ratio 17.3:1
  • Max engine speed 2800 to 2900 RPM

Isuzu 4HE1XS


  • In-line 4 stoke 4-cylinder engine
  • 4.75-liter displacement
  • 175 HP at 2700 RPM power output
  • Turbocharged
  • Mechanical injection
  • Compression ratio 17.3:1
  • Max engine speed 2800 to 2900 RPM

These are a few used engine models you can find on your website. However, if you want to buy other models of Isuzu diesel engines, let us know and we can stock them up. We sell diesel engines from other companies as well.

Why Buy Used Isuzu Diesel Engines?

Isuzu diesel engines are expensive so, it makes sense to buy used ones. But the question is what contributes to higher costs? Isuzu designs and manufactures its diesel engines to be the best in the market. The design of their diesel engine includes stronger cylinder blocks, hardened crankshafts, hardened camshafts, extremely precise cylinder wall to piston ring, and highly tuned and calibrated fuel injection equipment as well as calibrations.

All these features significantly boost fuel efficiency, reduce lube oil compression, vibrations, overall machine operation, and elongate the engine life with a satisfactory power band. That said, the Isuzu engines experience fewer failures, operate with extended service intervals, and provide end-users the best possible return on their investment. Each of these design characteristics come with a price, so that is why Isuzu diesel engines are expensive. If you have a tight budget but want high performance for your trucks, then you can invest in used Isuzu diesel truck engines. We provide fully tested and inspected engines with a 90-day warranty and the used engines are equally reliable as the new ones.

Are Used Isuzu Diesel Engines Reliable?

Isuzu diesel engines are synonymous with reliability, durability, and performance. For the past 87 years, diesel engines have stood the test of time and are loved by users around the globe. Isuzu engines are engineered to produce understated power and torque output to create a de-stressed environment, thus reducing engine wear and promoting longevity. Also, the engines have an optimum fuel-air mixture that ensures the heat generated by the combustion process is constant and also dissipated uniformly. The engines are designed as such that they generate maximum torque at low engine speeds. Due to all these characteristics Isuzu diesel engines are reliable and carry the legacy to the used ones as well. Moreover, used engines come with a warranty, so you can buy the engines without much ado.

Please get in touch with us to buy used Isuzu diesel truck engines at a price within your budget.