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Cummins/Onan S3.8-G8 Generator Set

The Cummins/Onan S3.8-G8 is a 40 kW (50 kVA) diesel standby generator set powered by a Cummins/Onan S3.8-G8 engine. It operates at 60 Hz.

40 kW
Standby
3.8 L
Displacement
1
Document types

How to read your Cummins/Onan serial & model number →

Typical fuel consumption for 40–45 kW Diesel generators →

Compare with other 40–45 kW Diesel generators →

Specifications

Fueldiesel
Frequency60.0 Hz
Standby power40 kW
Standby kVA50
Prime power36 kW

Engine

Cummins/Onan S3.8-G8
Displacement3.8 L
Rated speed1800 rpm

Service intervals

2
ItemActionHoursMonthsNotes
valve clearanceCheck2000 hrB-Series (4BT3.3): valve clearance checks not required for 2000 hours, twice the industry standard
engine overhaulOther20000 hrQSK23-Series: expected life cycle to 20,000 hours before first overhaul

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

What is the power rating of the Cummins/Onan S3.8-G8?

The Cummins/Onan S3.8-G8 is rated 40 kW standby (50.0 kVA).

What engine is in the Cummins/Onan S3.8-G8?

The Cummins/Onan S3.8-G8 is powered by the Cummins/Onan S3.8-G8 engine.

What fuel does the Cummins/Onan S3.8-G8 use?

The Cummins/Onan S3.8-G8 runs on diesel.

What is the prime power rating of the Cummins/Onan S3.8-G8?

The Cummins/Onan S3.8-G8 is rated 36 kW prime (45 kVA), against 40 kW standby.

Available documents

Reference — CUMMINS-GENERATOR-ENGINES-CATALOG (Cummins/Onan)

This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.