Isuzu UM4BG1Z – 108hp Marinised Propulsion Engine
Isuzu Japan Factory Marinised Propulsion Engine
The Isuzu UM4BG1Z is a robust, medium‑duty marine propulsion engine engineered to deliver consistent power, exceptional durability, and smooth operation in demanding commercial environments. Built on Isuzu’s proven 4‑cylinder, vertical in‑line diesel platform, the UM4BG1Z combines mechanical simplicity with high‑end performance—making it a trusted choice for operators seeking long‑term reliability at sea.
Engineered for Dependable Power
With a rated output of 81 kW (110 PS) at 2900 rpm, this naturally aspirated engine provides strong torque and stable power delivery across the operating range. Its direct‑injection combustion system ensures efficient fuel use, while the full‑flow pressure lubrication and freshwater cooling system keep the engine performing at its peak during long duty cycles.
Optimized for Marine Applications
Designed specifically for commercial vessels, the UM4BG1Z features a multi‑tube heat exchanger, seawater‑circulated intercooler, and a right‑hand rotation propeller shaft for seamless integration with marine drivetrains. Paired with the MGN30A marine gear—a wet, multi‑plate hydraulic clutch system—the engine offers versatile reduction ratio options (2.04–3.44) to suit a wide range of propulsion needs.
Built to Last
Weighing 560 kg with marine gear installed, the UM4BG1Z is constructed with durability in mind. Its rugged design, reliable 24V electrical system, and simple mechanical governor deliver years of low‑maintenance service. A comprehensive suite of standard accessories—including installation kit, control head, instrument panel, bilge pump, seawater pump impeller, and more—ensures faster installation and dependable onboard operation.
Your Trusted Power Source at Sea
Whether powering workboats, small commercial vessels, or specialized marine applications, the Isuzu UM4BG1Z offers an ideal balance of performance, fuel efficiency, and reliability. It’s a propulsion solution built for operators who demand consistency and value from every engine hour.
UM4BG1Z – Engine Specifications
| Category | Specification |
|---|---|
| Engine Model | UM4BG1Z |
| Configuration | 4‑cylinder, vertical in‑line, 4‑cycle diesel engine |
| Bore × Stroke | 105 × 125 mm (4.13 × 4.92 in) |
| Displacement | 4.329 L (264 cid) |
| Rated Output (Medium Duty) | 81 kW (110 PS) / 2900 rpm |
| Application | Commercial marine use |
| Governor Type | Mechanical |
| Combustion System | Direct injection |
| Aspiration | Natural aspiration |
| Engine Weight | 560 kg (1,235 lb) with MGN30A marine gear; 436 kg (961 lb) engine only |
| Fuel Type | Diesel |
| Starter | 24 V – 4.5 kW |
| Alternator | 24 V – 30 A |
| Lubrication | Full‑flow pressure circulation |
| Cooling System | Freshwater full‑flow cooling, indirect seawater cooling |
| Heat Exchanger | Multi‑tube type (freshwater → seawater circulation) |
| Intercooler | Multi‑tube type (seawater circulation) |
| Crankshaft Rotation | Right (clockwise) viewed from front |
| Propeller Shaft Rotation | Right (clockwise) viewed from stern |
| Idling Speed | 500–550 min⁻¹ |
| Marine Gear Model | MGN30A |
| Clutch Type | Wet, multi‑plate hydraulic clutch |
| Marine Gear Type | Constant‑mesh reverse gear |
| Reduction Ratios Available | 2.04, 2.52, 3.05, 3.44 |
Standard Accessories
- Installation kit
- Kingston valve
- Control head
- Bilge Pump
- Oil drain pump
- Blow-by pipe
- 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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