Isuzu UM4JG1TCX – 135hp Marinised Propulsion Engine
Isuzu Japan Factory Marinised Propulsion Engine
The Isuzu UM4JG1TCX is engineered to deliver dependable, high‑efficiency power for a wide range of commercial marine vessels. Built on Isuzu’s globally trusted diesel technology, this 4‑cylinder, vertical in‑line 4‑cycle engine provides an outstanding balance of durability, performance, and low operating cost—making it a smart choice for operators who demand reliability at sea.
High‑Performance Output in a Compact Package
With rated outputs of 101 kW (138 PS) at 3200 rpm in light‑duty operation and 94 kW (128 PS) at 3100 rpm for medium duty, the UM4JG1TCX delivers robust propulsion while maintaining smooth, efficient operation across the full engine speed range.
The turbocharged and intercooled design ensures excellent power density and responsiveness, even under continuous commercial workloads. An optimized fuel system and direct‑injection combustion further enhance efficiency, contributing to reduced operating costs and longer intervals between refuelling.
Designed for Demanding Marine Environments
The engine’s construction and systems are tailored for reliable marine service:
- Freshwater cooling with indirect seawater circulation for stable thermal management
- Multi‑tube heat exchanger and intercooler for consistent cooling performance
- Full‑flow pressure lubrication for extended engine life
- Wet, multi‑plate hydraulic marine gearbox (MGN30A) with multiple reduction ratios (2.04 to 3.44) suitable for various hull types and applications
Weighing 450 kg with marine gear, the UM4JG1TCX is compact and easy to integrate into new builds or repowers, without compromising on power delivery.
Smooth Operation and Easy Installation
Standard accessories—including an installation kit, control head, bilge pump, instrument panel, and more—ensure straightforward installation and simplified operation from day one. Optional control and stop cables allow for tailored vessel integration.
The Trusted Choice for Commercial Operators
Whether powering workboats, utility vessels, or commercial fishing craft, the Isuzu UM4JG1TCX offers:
- Proven Isuzu durability
- Low vibration and smooth power curves
- Strong torque for propulsion demands
- Straightforward maintenance and widely available parts
Backed by decades of marine engineering expertise, the UM4JG1TCX stands as a reliable backbone for commercial marine operations seeking long‑term performance and value.
Isuzu UM4JG1TCX – Engine Specifications
| Category | Specification |
|---|---|
| Configuration | 4‑cylinder, vertical in‑line, 4‑cycle diesel engine |
| Bore × Stroke | 95.4 × 107 mm (3.75 × 4.21 in) |
| Displacement | 3.059 L (186 cid) |
| Rated Output – Light Duty | 101 kW (138 PS) @ 3200 rpm |
| Rated Output – Medium Duty | 94 kW (128 PS) @ 3100 rpm |
| Application | Commercial use |
| Governor Type | Mechanical |
| Combustion System | Direct injection |
| Aspiration | Turbocharged / Intercooler |
| Engine Weight (with MGN30A) | 450 kg (992 lb) |
| Fuel Type | Diesel fuel |
| Starter | 24 V – 3.2 kW |
| Alternator | 24 V – 30 A |
| Lubrication Method | Full‑flow pressure circulation |
| Cooling System | Freshwater, full‑flow pressure circulation (seawater indirect) |
| Heat Exchanger | Multi‑tube type (freshwater → seawater) |
| Intercooler | Multi‑tube type (seawater circulation) |
| Crankshaft Rotation | Right (clockwise) viewed from front of engine |
| Propeller Shaft Rotation | Right (clockwise) viewed from stern |
| Idling Speed | 500–550 rpm |
| Marine Gear Model | MGN30A |
| Marine Gear Type | Constant‑mesh reverse gear, wet multi‑plate hydraulic clutch |
| Reduction Ratios | 2.04, 2.52, 3.05, 3.44 |
Standard Accessories
- Installation kit
- Kingston valve
- Control head
- Bilge Pump
- Battery relay
- Extension harness (3 m)
- Instrument panel
- Tool kit
- Owner’s manual
- Seawater pump impeller*
*Spare parts
Optional Accessories
- Extension harness (3 m)
- Control cable (4 m, 6 m, 10 m, 12 m)
- Stop cable (4 m, 6 m, 8 m)
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Zenith Engineering
Zenith Engineering provides general engineering services to local and interstate customers. In our workshop we have access to CNC machinery and manual lathes. With our highly experienced engineering team and ...
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