Cummins/Onan — Radiator Core Cleaning - General (Pressurized Water)
Maintenance
From a Cummins/Onan service manual covering: QSX15, QSX15-G8, QSX15-G9. Check it applies to your exact model before use.
Applies to: Cummins/Onan DFE, Cummins/Onan DFEJ, Cummins/Onan DFEK, Cummins/Onan QSx15, Cummins/Onan QSX15-G9 engine
Before you start
- With the pressures involved keep the distance between core face and nozzle a minimum of 450 mm (18 inches); any closer and damage may occur.
- Degreasing additive must not contain ammonia as it will corrode the core.
- Follow pressure washer Manufacturer's Health and Safety Guidelines.
Procedure
- On enclosed sets with removable end panel(s), remove the end panel(s) to assist cleaning.
- Inspect the exterior of the radiator for obstructions.
- Pressure wash in the opposite direction to the airflow; apply a proprietary degreasing additive (must not contain ammonia).
- Use an industrial pressure washer with a hot water washer for effectiveness; protect the set from over spray.
- Keep nozzle a minimum of 450 mm (18 inches) from the core face and lance at a right angle to the core.
- Replace the end panel(s) where necessary.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Nozzle-to-core face minimum distance: 450 mm (18 inches)
- Typical pressure washer pressure: 1500 psi to 3000 psi (103 bar to 206 bar); if above 3000 psi, increase gap
Full service-parts list: Cummins/Onan DFE →, Cummins/Onan DFEJ →, Cummins/Onan DFEK →, Cummins/Onan QSx15 →
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.