Cummins/Onan QST30 / QST30 G-Drive — ECM Mounting
Installation
For the Cummins/Onan QST30 / QST30 G-Drive, from the Cummins/Onan service manual.
Applies to: Cummins/Onan QST30, Cummins/Onan QST30 engine
Before you start
- Make sure there is no grease or dirt on the ECM mounting surfaces. Properly tighten the 6 capscrews per the capscrew size/grade torque recommendations to prevent mounting failures.
Procedure
- Determine the location for the ECM; ensure sufficient clearance for the wiring harnesses.
- Use all 6 mounting holes; machine and tap, or drill thru clearance holes for capscrews and nuts.
- Tighten the 6 capscrews per the capscrew size/grade torque recommendations.
- Do not mount the ECM directly to the engine block or any engine block component without proper thermal and/or vibratory isolation.
- Mount the ECM up to 15.2 m [50 ft] total harness length from the engine harness at the flywheel housing.
Specs & values
- ECM mass 2.7 kg [6 lb]
- Mounting holes 6 mm diameter, 75 mm apart; 191 mm between rails
- Max total harness length 15.2 m [50 ft]
Full service-parts list: Cummins/Onan QST30 →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.