Isuzu 4JG1T vs Yanmar 4TNV98-ZGGES
The Isuzu 4JG1T and Yanmar 4TNV98-ZGGES are both diesel generator engines in a similar power class. Both are rated at roughly 39 kVA. Displacement is 3.059 L versus 3.119 L. The table below compares their full specifications side by side.
| Specification | Isuzu 4JG1T | Yanmar 4TNV98-ZGGES |
|---|---|---|
| Headline rating | 39 kVA | 38 kVA |
| Standby (50 Hz) | 31.1 kWe | 30.5 kWe |
| Prime (50 Hz) | 29.6 kWe | — |
| Standby (60 Hz) | 37.8 kWe | 36.7 kWe |
| Prime (60 Hz) | 36 kWe | — |
| Displacement | 3.059 L | 3.119 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | U.S. EPA Tier 3 |
| Dry weight | — | — |
| Origin | Japan | Japan |
Choosing between Isuzu 4JG1T and Yanmar 4TNV98-ZGGES
Use this comparison as an engineering shortlist, then confirm the complete generator package against load profile, voltage, 50/60 Hz frequency, duty class, emissions rules, cooling margin, altitude, ambient temperature, enclosure design, controller features, and alternator sizing. The Isuzu 4JG1T has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.