Cummins QSV81G & QSV91G Gas Engine Wiring Diagram (Bulletin 4021329-00)

Bulletin 4021329-00 is the Cummins wiring diagram for the QSV81G and QSV91G, lean-burn natural gas engines built for continuous-duty power generation.

It covers wiring on the engine side and on the DC box side, connector views with pinouts, the MCM700 and SMM558 control system wiring, and the sensor and ignition circuits. Gas engines have ignition and detonation monitoring circuits that a diesel technician may not be used to, and this diagram lets you trace them.

What the diagrams show

• Engine-side and DC box-side wiring
• Connector views and pinouts
• MCM700 and SMM558 control system wiring
• Sensor and ignition system circuits

Compatibility

• Models: QSV81G, QSV91G
• Fuel: Natural gas, lean-burn
• Control system: MCM700 / SMM558
• Publication: Bulletin 4021329-00
• Document type: Wiring diagram

Before you buy

This is a wiring diagram only. It has no repair or overhaul procedures.

Your engine's dataplate shows the engine model, the engine serial number (ESN) and the CPL number. Compare those with the models above. If you're not sure, email us the dataplate details and we'll check for you.

File format

Digital download, delivered as a ZIP file. Unzip it before opening. Opens on a computer, tablet or phone.

We're an independent seller and are not affiliated with or endorsed by Cummins. Brand and model names are used only to identify the engines this manual covers.