Kirloskar
Kirloskar 4R1040
R1040 Series
Kirloskar (KOEL) 4R1040 4.2L 4-cylinder diesel engine for generator sets. 38.3 kWe standby. EPA Tier 2. kWe estimated from rated mechanical output. Naturally Aspirated.
Overhaul & repair parts- Manufacturer files
- 2 datasheets
- Last updated
- 2026-06-11
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 48 kVA
- Electrical Output
- 38 kWe
- Cylinders
- L4
- Displacement
- 4.2 L
- Rated Speed
- 1,500 / 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf · kWe estimated — see note below
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 38.8 | 34.9 | 43.6 |
| Standby Power | 42.5 | 38.3 | 47.9 |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 45.5 | 41 | 51.3 |
| Standby Power | 50.7 | 45.6 | 57 |
Note: The manufacturer does not publish a separate kWe rating for this engine. kWe values shown are estimated from the rated mechanical output (kWm) using a conservative 90% alternator efficiency factor.
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Kirloskar 4R1040 overhaul & repair parts
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Kirloskar 4R1040 generator set context
The Kirloskar 4R1040 is listed here as a diesel generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 48 kVA / 38 kWe / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
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Technical Specifications
| Brand | Kirloskar |
| Model | 4R1040 |
| Series | R1040 Series |
| Configuration | L4 |
| Cylinders | 4 |
| Displacement | 4.2 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Tier 2 |
| Country of Origin | India |
Frequently asked questions
What is the power output of the Kirloskar 4R1040?
The Kirloskar 4R1040 is rated at 48 kVA standby / 44 kVA prime at 50 Hz (1,500 rpm); and 57 kVA standby / 51 kVA prime at 60 Hz (1,800 rpm).
Does the 4R1040 run at 50 Hz or 60 Hz?
The Kirloskar 4R1040 is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the Kirloskar 4R1040 use?
The Kirloskar 4R1040 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 4R1040?
The Kirloskar 4R1040 is an inline-4 (4-cylinder) engine with a displacement of 4.2 L.
What emissions information is listed for the 4R1040?
This record lists U.S. EPA Tier 2 for the Kirloskar 4R1040. Confirm the exact engine family, model year, configuration and applicable manufacturer certification documents before specifying it for a regulated project. A database label does not establish certification of a complete generator package.
What is the catalog status of the Kirloskar 4R1040?
The Kirloskar 4R1040 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.
Are reference documents available for the 4R1040?
This page links reference documents for the Kirloskar 4R1040. Check each document's title, model coverage, revision and rating conditions before using it for selection.