Cummins/Onan — Cleaning Radiator Cores Using Pressurized Water Equipment
Maintenance · Cooling system / radiator
From a Cummins/Onan service manual covering: C25 D6, C30 D6, C35 D6, C40 D6, C50 D6, C60 D6. Check it applies to your exact model before use.
Applies to: Cummins/Onan C25 D6, Cummins/Onan C30 D6, Cummins/Onan C35 D6, Cummins/Onan C40 D6, Cummins/Onan C50 D6, Cummins/Onan C60 D6, Cummins/Onan 4BT3.3 engine, Cummins/Onan 4BT3.3-G5 engine, Cummins/Onan 4BT3.3-G7 engine
Before you start
- Do not use cleaners containing ammonia.
- Wear PPE when cleaning with a pressure washer or compressed air.
Procedure
- Remove enclosure end panel(s) to assist cleaning.
- Inspect radiator exterior for obstructions.
- Pressure wash in the opposite direction to the airflow.
- Keep lance at a right angle to core, minimum 18 inches (450 mm) distance.
- 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 18 inches (450 mm)
- Pressure washer 1500 psi to 3000 psi (103 to 206 bar)
Full service-parts list: Cummins/Onan C25 D6 →, Cummins/Onan C35 D6 →, Cummins/Onan C50 D6 →, Cummins/Onan C60 D6 →
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.