The 4JB1 / JX493Q1 is a 2.8L inline-four direct-injection diesel engine used across selected light-truck, pickup and commercial-vehicle applications. This complete-engine offering is intended for replacement and distribution programs where the buyer can verify the original engine code and external configuration before ordering.
Key Features
- 2,771 cc inline-four diesel architecture
- Four-cycle, water-cooled OHV design
- Direct-injection fuel system
- Gear-driven timing system
- Dry-type cylinder-liner construction
- Complete-engine supply for repair networks, distributors and fleet programs
- Accessory and emissions configuration available according to the confirmed application
Technical Specifications
| Engine code | 4JB1 / JX493Q1 (493 series) |
|---|---|
| Displacement | 2,771 cc (2.8 L) |
| Configuration | Inline 4-cylinder, four-cycle, water-cooled, OHV |
| Fuel system | Diesel direct injection |
| Bore × stroke | 93 × 102 mm |
| Timing system | Gear drive |
| Firing order | 1-3-4-2 |
| Power and torque | Application-specific calibration; confirm the required engine variant and rated speed |
Vehicle Applications
| Application group | Fitment guidance |
|---|---|
| JMC light trucks and light commercial vehicles | For selected vehicles originally equipped with a matching JX493-series engine. Confirm the complete suffix and external configuration. |
| Isuzu-family light trucks and pickups | For selected applications originally equipped with a matching 4JB1-series engine. Market and model-year coverage varies. |
| Other 4JB1 / 493-family applications | Engine-family use does not guarantee direct fitment. Full technical comparison is required. |
What Is Included
- Assembled cylinder block and rotating assembly
- Cylinder head and valvetrain
- Timing gear system
- Lubrication system and oil pan
Components That May Vary
The product images show an illustrated complete-engine configuration. Turbocharging, injection-pump calibration, emissions hardware, alternator, starter, cooling fan, pulleys, belts, manifolds, hoses, sensors, wiring, flywheel, clutch housing, mounts, brackets and oil-pan arrangement may change with the application and quotation scope.
Fitment Verification
Before ordering, please provide the VIN or chassis number, vehicle make and model, model year, sales market, complete original engine code and a clear nameplate photo. Please also send photos of the intake, exhaust, oil pan, flywheel housing, mounts and accessories. Vehicle model and year alone do not guarantee direct fitment.
Factory Supply & Custom Service
Yuan Yi is an integrated manufacturer and exporter with more than 20 years of engine machining and manufacturing experience. We support distributors, engine rebuilders, repair networks and fleet customers with configuration review, production coordination and export supply. Contact us with your engine code, required quantity and destination market for a quotation.
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