The Isuzu D-Max I 2.5 TD Single Cab, produced between 2008 and 2012, represents the first generation of Isuzu’s globally successful pickup truck. This variant, powered by the 4JK1-TC 2.5-liter turbocharged diesel engine producing 136 horsepower, was a workhorse aimed at commercial users and those needing a robust, no-frills vehicle. It served as an entry-level offering within the D-Max range, positioned below the more powerful and feature-rich double-cab models. The D-Max I was Isuzu’s attempt to establish a stronger foothold in the competitive mid-size pickup market, particularly in regions like Australia, Europe, and Asia, where demand for practical and durable trucks remained high.
Technical Specifications
| Brand | Isuzu |
| Model | D-Max |
| Generation | D-Max I |
| Type (Engine) | 2.5 TD Single Cab (136 Hp) |
| Start of production | 2008 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 4 |
| Doors | 2/4 |
| Fuel consumption (urban) | 9.5 l/100 km (24.8 US mpg) |
| Fuel consumption (extra urban) | 6.3 l/100 km (37.3 US mpg) |
| Fuel consumption (combined) | 7.4 l/100 km (31.8 US mpg) |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 25.7 sec |
| Acceleration 0 – 62 mph | 25.7 sec |
| Acceleration 0 – 60 mph | 24.4 sec |
| Maximum speed | 150 km/h (93.21 mph) |
| Emission standard | Euro 4 |
| Power | 136 Hp @ 3600 rpm |
| Torque | 280 Nm @ 1800 rpm (206.52 lb.-ft. @ 1800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | 4JK1 |
| Engine displacement | 2499 cm3 (152.5 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 95.4 mm (3.76 in.) |
| Piston Stroke | 87.4 mm (3.44 in.) |
| Compression ratio | 8.3:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Precombustion chamber injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Coolant capacity | 8.7 l (9.19 US qt | 7.65 UK qt) |
| Fuel tank capacity | 76 l (20.08 US gal | 16.72 UK gal) |
| Length | 5030 mm (198.03 in.) |
| Width | 1720 mm (67.72 in.) |
| Height | 1635 mm (64.37 in.) |
| Wheelbase | 3050 mm (120.08 in.) |
| Front track | 1460 mm (57.48 in.) |
| Rear track | 1460 mm (57.48 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 5 gears, manual transmission |
| Front suspension | Independent torsion bar, double wishbone |
| Rear suspension | Spring Strut |
| Front brakes | Ventilated discs |
| Rear brakes | Drum |
| Tires size | 225/75 R15 |
Powertrain & Engine Architecture
The heart of the D-Max I 2.5 TD Single Cab is the 4JK1-TC 2.5-liter inline-four diesel engine. This engine utilizes a precombustion chamber injection system, a design common in older diesel engines, which aids in more complete combustion and reduces noise. The addition of a turbocharger and intercooler significantly boosts power output compared to naturally aspirated versions. The 4JK1 engine is known for its durability and relatively simple construction, making it easier to maintain. The five-speed manual transmission was the standard offering for this variant, providing a direct connection to the engine and allowing for precise control. The transmission’s gear ratios were geared towards maximizing fuel efficiency and providing adequate torque for hauling and towing, rather than outright acceleration.
Driving Characteristics
The 136 horsepower and 280 Nm (206 lb-ft) of torque delivered by the 2.5-liter diesel engine provided adequate, but not exhilarating, performance. Acceleration from 0-60 mph took around 24.4 seconds, and top speed was limited to 93 mph. The focus was on usability and reliability rather than speed. The manual transmission allowed drivers to make the most of the available power, but the engine lacked the refinement of more modern diesel engines. The truck felt most comfortable at lower speeds, providing ample torque for hauling loads or navigating rough terrain. Compared to the higher-output 3.0-liter variants, the 2.5 TD felt noticeably slower, especially when fully loaded.
Equipment & Trim Levels
The Single Cab 2.5 TD was typically offered in a basic trim level, prioritizing functionality over luxury. Standard equipment generally included power steering, central locking, and an AM/FM radio. Air conditioning was often an optional extra. The interior was utilitarian, with durable plastic trim and cloth upholstery. The Single Cab configuration offered a spacious cabin for two occupants, with a separate cargo bed behind. Optional extras could include alloy wheels, upgraded audio systems, and a limited-slip differential.
Chassis & Braking
The D-Max I featured a robust ladder-frame chassis, providing a solid foundation for its work-oriented design. The front suspension utilized independent torsion bars and double wishbones, offering a reasonable level of ride comfort. The rear suspension employed leaf springs, which were well-suited for carrying heavy loads. Braking duties were handled by ventilated discs at the front and drum brakes at the rear. While adequate for most applications, the braking system lacked the stopping power of more modern setups. The truck’s tires were typically 225/75 R15, chosen for their durability and all-terrain capability.
Market Reception & Comparison
The Isuzu D-Max I 2.5 TD Single Cab was generally well-received as a practical and reliable work truck. Critics praised its durability and fuel efficiency, but noted its lack of refinement compared to some of its competitors, such as the Toyota Hilux and Nissan Navara. The 2.5-liter engine offered good fuel economy, achieving around 31.8 US mpg on the combined cycle. However, its lower power output meant it wasn’t as capable as some of the higher-spec models when towing or carrying heavy loads. The manual transmission was appreciated by those who preferred a more engaging driving experience, but some found it less convenient than an automatic.
Legacy
The Isuzu D-Max I 2.5 TD Single Cab has proven to be a durable and reliable vehicle, with many examples still in service today. The 4JK1 engine is known for its longevity, and with proper maintenance, can withstand high mileage. In the used car market, these trucks are often sought after by those looking for a dependable and affordable workhorse. While not as popular as some of its competitors, the D-Max I established Isuzu as a serious player in the mid-size pickup segment, paving the way for the continued success of the D-Max line.
