Description
Buy Isuzu D-Max 1.9L RZ4E-TC Engine
The Isuzu RZ4E-TC engine, introduced in the 2017/2018 D-Max range, represents a significant leap in Isuzu’s diesel engineering. Despite its smaller 1.9L displacement, it was designed to replace the 2.5L 4JK1, offering higher thermal efficiency, reduced weight (approx. 60kg lighter), and lower internal friction. In 2026, this “Blue Power” unit is highly regarded for its balance of 3,500kg towing capacity and class-leading fuel economy.
Technical Data & Performance Specifications
| Feature | Details |
| Engine Code | RZ4E-TC / RZ4E |
| Type | In-Line 4-Cylinder, VGS Turbo Intercooler Diesel, DOHC 16V |
| Displacement | 1,898 cc (1.9L) |
| Max Power | 120 kW (163–164 HP) @ 3,600 RPM |
| Max Torque | 360 Nm @ 2,000–2,500 RPM |
| Bore x Stroke | 80.0 mm x 94.4 mm |
| Compression Ratio | 16.5:1 |
| Fuel System | Direct Injection Electronic Common Rail (Up to 2,000 bar) |
Engineering Highlights: Built for Longevity
Isuzu utilized advanced materials usually reserved for high-performance sports engines to ensure the RZ4E handles high-boost pressures reliably:
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DLC (Diamond-Like Carbon): Applied to the fuel injector needles and piston pins to reduce friction and heat wear.
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Graphite Coated Pistons: Minimizes friction during cold starts and high-speed operation.
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Timing Chain: Uses a heavy-duty steel timing chain instead of a belt, significantly reducing long-term maintenance costs.
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Hydraulic Valve Lash Adjusters (HVLA): Eliminates the need for manual valve clearance adjustments, ensuring the engine remains quiet and efficient.
Condition & Warranty Summary (Stock #RZ4ETC-8)
| Feature | Details |
| Stock Condition | Used |
| Mileage | 81,250 Miles |
| VIN / OE-Number | rz4etc-motor-8 |
| Model Compatibility | Isuzu D-Max TFR / TFS Series (2017–Present) |
| Warranty (Internal) | 6-Month Limited Warranty (Covers internal components only) |
Critical Maintenance for RZ4E Owners
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Oil Specification: Always use a Low-SAPS (Low Ash) 5W-30 oil (ACEA C3) to protect the Diesel Particulate Filter (DPF). Using the wrong oil can lead to premature DPF clogging and “Limp Mode.”
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Oil Change Interval: While the manufacturer may suggest longer intervals, we recommend changes every 7,500 to 10,000 miles for heavy-duty or towing use.
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DPF Care: This engine requires regular “highway blasts” (at least 20 minutes at 60+ mph) to facilitate a full DPF regeneration cycle, especially if the vehicle is primarily used for city driving.
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