Cummins/Onan QSV91 series Engine
The Cummins/Onan QSV91 series is a 91.6 L turbocharged low temperature aftercooled engine. It powers generator sets from Cummins/Onan, including the C2000 N5C, C2000 N6C and QSV91.
Also known as: Cummins QSV91 series
Part of the Cummins/Onan QSV91 engine family — 3 variants share parts & fitment.
Engine specifications
| Displacement | 91.6 L |
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| Aspiration | turbocharged low temperature aftercooled |
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Common problems
15- Battery completely discharged
Cause: Poor battery terminal connection
Fix: Clean connections, replace and tighten. - Battery low charge
Cause: Poor battery connection
Fix: Clean connections, reconnect and tighten securely. - High Intake Manf 1 Temp 153
- Battery overcharged
Cause: Charge alternator fault
Fix: Contact your nearest Cummins Power Generation distributor. - Sensor Supply 2 Low 187
- Manifold 1 Press High 122
- Low Coolant Pressure 228
- Low Coolant Level 197
- Inj Metering 1 Press Low 452
- Inj Metering 1 Press High 449
- High Intake Manf 1 Temp — engine has overheated (intake manifold temperature has risen above the shutdown trip point) 155
Cause: Large load or high ambient temperature may be the cause
Fix: Review fault code 151 correction list for other possible causes - High Fuel Temperature 261
- Weak Battery — during cranking, the battery voltage is at, or below the weak battery warning trip point for a time greater than, or equal to the weak battery set time 1442
Cause: Weak or discharged battery
Fix: If the engine can be stopped, allow the engine to cool down completely before proceeding with the following checks: See code 441 - Water in Fuel Indicator Sensor: Voltage Below Normal 429
- Water in Fuel Indicator Sensor: Voltage Above Normal 428
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSV91 series.
Parts cataloged across the Cummins/Onan QSV91 family
4| Part # | Description | Category |
|---|
| QSK60-G9 | Engine model for C2500 D5A generator sets | Engine |
| QSK60G | Engine model QSK60G | Engine |
| QSV91G | Cummins QSV91G lean burn gas generator sets | Engine |
| F-1579 | Rev. 2/08 (2005) | Service part / kit |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Common questions
What is the displacement of the Cummins/Onan QSV91 series?
The Cummins/Onan QSV91 series has a displacement of 91.6 liters.
Which generators use the Cummins/Onan QSV91 series engine?
The Cummins/Onan QSV91 series powers 3 generator set(s), including Cummins/Onan C2000 N5C, Cummins/Onan C2000 N6C, Cummins/Onan QSV91.
What is a common problem with the Cummins/Onan QSV91 series engine?
A commonly reported issue on generators using the Cummins/Onan QSV91 series is: Battery completely discharged. Cause: Poor battery terminal connection. Fix: Clean connections, replace and tighten..